w3resource

C Basic: Exercises, Practice, Solution

C Basic Declarations and Expressions [150 exercises with solution]

[An editor is available at the bottom of the page to write and execute the scripts.]

1. Write a C program to print your name, date of birth. and mobile number. Go to the editor
Expected Output:

Name   : Alexandra Abramov  
DOB    : July 14, 1975  
Mobile : 99-9999999999

Click me to see the solution

2. Write a C program to get the C version you are using. Go to the editor
Expected Output:

We are using C18!

Click me to see the solution

3. Write a C program to print a block F using hash (#), where the F has a height of six characters and width of five and four characters. And also to print a big 'C'. Go to the editor
Expected Output:

######
#
#
#####
#
#
#
    ######
  ##      ##
 #
 #
 #
 #
 #
  ##      ##
    ######

Click me to see the solution

4. Write a C program to print the following characters in a reverse way. Go to the editor
Test Characters: 'X', 'M', 'L'
Expected Output:
The reverse of XML is LMX
Click me to see the solution

5. Write a C program to compute the perimeter and area of a rectangle with a height of 7 inches. and width of 5 inches. Go to the editor
Expected Output:
Perimeter of the rectangle = 24 inches
Area of the rectangle = 35 square inches
Click me to see the solution

6. Write a C program to compute the perimeter and area of a circle with a given radius. Go to the editor
Expected Output:
Perimeter of the Circle = 37.680000 inches
Area of the Circle = 113.040001 square inches
Click me to see the solution

7. Write a C program to display multiple variables. Go to the editor
Sample Variables :
a+ c, x + c,dx + x, ((int) dx) + ax, a + x, s + b, ax + b, s + c, ax + c, ax + ux
Declaration :
int a = 125, b = 12345;
long ax = 1234567890;
short s = 4043;
float x = 2.13459;
double dx = 1.1415927;
char c = 'W';
unsigned long ux = 2541567890;
Click me to see the solution

8. Write a C program to convert specified days into years, weeks and days. Go to the editor
Note: Ignore leap year.

Test Data :
Number of days : 1329
Expected Output :
Years: 3
Weeks: 33
Days: 3
Click me to see the solution

9. Write a C program that accepts two integers from the user and calculate the sum of the two integers. Go to the editor
Test Data :
Input the first integer: 25
Input the second integer: 38
Expected Output:
Sum of the above two integers = 63
Click me to see the solution

10. Write a C program that accepts two integers from the user and calculate the product of the two integers. Go to the editor
Test Data :
Input the first integer: 25
Input the second integer: 15
Expected Output:
Product of the above two integers = 375
Click me to see the solution

11. Write a C program that accepts two item’s weight (floating points' values ) and number of purchase (floating points' values) and calculate the average value of the items. Go to the editor
Test Data :
Weight - Item1: 15
No. of item1: 5
Weight - Item2: 25
No. of item2: 4
Expected Output:
Average Value = 19.444444
Click me to see the solution

12. Write a C program that accepts an employee's ID, total worked hours of a month and the amount he received per hour. Print the employee's ID and salary (with two decimal places) of a particular month. Go to the editor
Test Data :
Input the Employees ID(Max. 10 chars): 0342
Input the working hrs: 8
Salary amount/hr: 15000
Expected Output:
Employees ID = 0342
Salary = U$ 120000.00
Click me to see the solution

13. Write a C program that accepts three integers and find the maximum of three. Go to the editor
Test Data :
Input the first integer: 25
Input the second integer: 35
Input the third integer: 15
Expected Output:
Maximum value of three integers: 35
Click me to see the solution

14. Write a C program to calculate a bike’s average consumption from the given total distance (integer value) traveled (in km) and spent fuel (in liters, float number – 2 decimal point). Go to the editor
Test Data :
Input total distance in km: 350
Input total fuel spent in liters: 5
Expected Output:
Average consumption (km/lt) 70.000
Click me to see the solution

15. Write a C program to calculate the distance between the two points. Go to the editor
Test Data :
Input x1: 25
Input y1: 15
Input x2: 35
Input y2: 10
Expected Output:
Distance between the said points: 11.1803
Click me to see the solution

16. Write a C program to read an amount (integer value) and break the amount into smallest possible number of bank notes. Go to the editor
Test Data :
Input the amount: 375
Expected Output:
There are:
3 Note(s) of 100.00
1 Note(s) of 50.00
1 Note(s) of 20.00
0 Note(s) of 10.00
1 Note(s) of 5.00
0 Note(s) of 2.00
0 Note(s) of 1.00
Click me to see the solution

17. Write a C program to convert a given integer (in seconds) to hours, minutes and seconds. Go to the editor
Test Data :
Input seconds: 25300
Expected Output:
There are:
H:M:S - 7:1:40
Click me to see the solution

18. Write a C program to convert a given integer (in days) to years, months and days, assumes that all months have 30 days and all years have 365 days. Go to the editor
Test Data :
Input no. of days: 2535
Expected Output:
6 Year(s)
11 Month(s)
15 Day(s)
Click me to see the solution

19. Write a C program that accepts 4 integers p, q, r, s from the user where q, r and s are positive and p is even. If q is greater than r and s is greater than p and if the sum of r and s is greater than the sum of p and q print "Correct values", otherwise print "Wrong values". Go to the editor
Test Data :
Input the second integer: 35
Input the third integer: 15
Input the fourth integer: 46
Expected Output:
Wrong values
Click me to see the solution

20. Write a C program to print the roots of Bhaskara’s formula from the given three floating numbers. Display a message if it is not possible to find the roots. Go to the editor
Test Data :
Input the first number(a): 25
Input the second number(b): 35
Input the third number(c): 12
Expected Output:
Root1 = -0.60000
Root2 = -0.80000
Click me to see the solution

21. Write a C program that reads an integer and check the specified range where it belongs. Print an error message if the number is negative and greater than 80. Go to the editor
Test Data :
Input an integer: 15
Expected Output:
Range [0, 20]
Click me to see the solution

22. Write a C program that read 5 numbers and sum of all odd values between them. Go to the editor
Test Data :
Input the first number: 11
Input the second number: 17
Input the third number: 13
Input the fourth number: 12
Input the fifth number: 5
Expected Output:
Sum of all odd values: 46
Click me to see the solution

23. Write a C program that reads three floating values and check if it is possible to make a triangle with them. Also calculate the perimeter of the triangle if the said values are valid. Go to the editor
Test Data :
Input the first number: 25
Input the second number: 15
Input the third number: 35
Expected Output:
Perimeter = 75.0
Click me to see the solution

24. Write a C program that reads two integers and checks whether they are multiplied or not. Go to the editor
Test Data :
Input the first number: 5
Input the second number: 15
Expected Output:
Multiplied!
Click me to see the solution

25. Write a C program that reads an integer between 1 and 12 and print the month of the year in English. Go to the editor
Test Data :
Input a number between 1 to 12 to get the month name: 8
Expected Output:
August
Click me to see the solution

26. Write a C program that prints all even numbers between 1 and 50 (inclusive). Go to the editor
Test Data :
Even numbers between 1 to 50 (inclusive):
Expected Output:
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
Click me to see the solution

27. Write a C program that read 5 numbers and counts the number of positive numbers and negative numbers. Go to the editor
Test Data :
Input the first number: 5
Input the second number: -4
Input the third number: 10
Input the fourth number: 15
Input the fifth number: -1
Expected Output:
Number of positive numbers: 3
Number of negative numbers: 2
Click me to see the solution

28. Write a C program that read 5 numbers and counts the number of positive numbers and print the average of all positive values. Go to the editor
Test Data :
Input the first number: 5
Input the second number: 8
Input the third number: 10
Input the fourth number: -5
Input the fifth number: 25
Expected Output:
Number of positive numbers: 4
Average value of the said positive numbers: 12.00
Click me to see the solution

29. Write a C program that read 5 numbers and sum of all odd values between them. Go to the editor
Test Data :
Input the first number: 5
Input the second number: 7
Input the third number: 9
Input the fourth number: 10
Input the fifth number: 13
Expected Output:
Sum of all odd values: 34
Click me to see the solution

30. Write a C program to find and print the square of each one of the even values from 1 to a specified value. Go to the editor
Test Data :
List of square of each one of the even values from 1 to a 4 :
Expected Output:
2^2 = 4
4^2 = 16
Click me to see the solution

31. Write a C program to check whether a given integer is positive even, negative even, positive odd or negative odd. Print even if the number is 0. Go to the editor
Test Data :
Input an integer: 13
Expected Output:
Positive Odd
Click me to see the solution

32. Write a C program to print all numbers between 1 to 100 which divided by a specified number and the remainder will be 3. Go to the editor
Test Data :
Input an integer: 25
Expected Output:
3
28
53
78
Click me to see the solution

33. Write a C program that accepts some integers from the user and find the highest value and the input position. Go to the editor
Test Data :
Input 5 integers:
5
7
15
23
45
Expected Output:
Highest value: 45
Position: 5
Click me to see the solution

34. Write a C program to compute the sum of consecutive odd numbers from a given pair of integers. Go to the editor
Test Data :
Input a pair of numbers (for example 10,2):
Input first number of the pair: 10
Input second number of the pair: 2
Expected Output:
List of odd numbers: 3
5
7
9
Sum=24
Click me to see the solution

35. Write a C program to check whether two numbers in a pair is in ascending order or descending order. Go to the editor
Test Data :
Input a pair of numbers (for example 10,2 : 2,10):
Input first number of the pair: 10
Expected Output:
Input second number of the pair: 2
The pair is in descending order!
Click me to see the solution

36. Write a C program to read a password until it is correct. For wrong password print "Incorrect password" and for correct password print "Correct password" and quit the program. The correct password is 1234. Go to the editor
Test Data :
Input the password: 1234
Expected Output:
Correct password
Click me to see the solution

37. Write a C program to read the coordinates(x, y) (in Cartesian system) and find the quadrant to which it belongs (Quadrant -I, Quadrant -II, Quadrant -III, Quadrant -IV). Go to the editor
Note: A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates.
These are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the (x,y) coordinates are I(+,+), II (−,+), III (−,−), and IV (+,−).
Test Data :
Input the Coordinate(x,y):
x: 25
y: 15
Expected Output:
Quadrant-I(+,+)
Click me to see the solution

38. Write a program that reads two numbers and divide the first number by second number. If the division not possible print "Division not possible". Go to the editor
Test Data :
Input two numbers:
x: 25
y: 5
Expected Output: 5.0
Click me to see the solution

39. Write a C program to calculate the sum of all number not divisible by 17 between two given integer numbers. Go to the editor
Test Data :
Input the first integer: 50 Input the second integer: 99
Expected Output:
Sum: 3521
Click me to see the solution

40. Write a C program to find all numbers which are dividing by 7 and the remainder is equal to 2 or 3 between two given integer numbers. Go to the editor
Test Data :
Input the first integer: 25
Input the second integer: 45
Expected Output:
30
31
37
38
44
Click me to see the solution

41. Write a C program to print 3 numbers in a line, starting from 1 and print n lines. Accept number of lines (n, integer) from the user. Go to the editor
Test Data :
Input number of lines: 5
Expected Output:
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
Click me to see the solution

42. Write a C program to print a number, it’s square and cube in a line, starting from 1 and print n lines. Accept number of lines (n, integer) from the user. Go to the editor
Test Data :
Input number of lines: 5
Expected Output:
1 1 1
2 4 8
3 9 27
4 16 64
5 25 125
Click me to see the solution

43. Write a C program that reads two integers p and q, print p number of lines in a sequence of 1 to q in a line. Go to the editor
Test Data :
Input number of lines: 5
Number of characters in a line: 6
Expected Output:
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
25 26 27 28 29 30
Click me to see the solution

44. Write a C program to calculate the average marks of mathematics of some students. Input 0 (excluding to calculate the average) or negative value to terminate the input process. Go to the editor
Test Data :
Input Mathematics marks (0 to terminate): 10
15
20
25
0
Expected Output:
Average marks in Mathematics: 17.50
Click me to see the solution

45. Write a C program to calculate the value of S where S = 1 + 1/2 + 1/3 + … + 1/50. Go to the editor
Expected Output:
Value of S: 4.50
Click me to see the solution

46. Write a C program to calculate the value of S where S = 1 + 3/2 + 5/4 + 7/8. Go to the editor
Expected Output:
Value of series: 4.62
Click me to see the solution

47. Write a C program that reads an integer and find all its divisor. Go to the editor
Test Data:
Input an integer: 45
Expected Output:
All the divisor of 45 are:
1
3
5
9
15
45
Click me to see the solution

48. Write a C program to read and print the elements of an array of length 7, before print replace every negative number, zero with 100. Go to the editor
Test Data:
Input the 5 members of the array:
25
45
35
65
15

Expected Output:
Array values are:
n[0] = 25
n[1] = 45
n[2] = 35
n[3] = 65
n[4] = 15
Click me to see the solution

49. Write a C program to read and print the elements of an array of length 7, before print, put the triple of the previous position starting from the second position of the array. Go to the editor
For example, if the first number is 2, the array numbers must be 2, 6, 18, 54 and 162
Test Data:
Input the first number of the array: 5
Expected Output:
n[0] = 5
n[1] = 15
n[2] = 45
n[3] = 135
n[4] = 405
Click me to see the solution

50. Write a C program to read an array of length 5 and print the position and value of the array elements of value less than 5. Go to the editor
Test Data:
Input the 5 members of the array:
15
25
4
35
40
Expected Output:
A[2] = 4.0
Click me to see the solution

51. Write a C program to read an array of length 6, change the first element by the last, the second element by the fifth and the third element by the fourth. Print the elements of the modified array. Go to the editor
Test Data:
Input the 5 members of the array:
15
20
25
30
35

Expected Output:
array_n[0] = 35
array_n[1] = 30
array_n[2] = 25
array_n[3] = 20
array_n[4] = 15
Click me to see the solution

52. Write a C program to read an array of length 6 and find the smallest element and its position. Go to the editor
Test Data:
Input the length of the array: 5 Input the array elements:
25
35
20
14
45
Expected Output:
Smallest Value: 14
Position of the element: 3
Click me to see the solution

53. Write a C program that accepts principle, rate of interest, time and compute the simple interest. Go to the editor
Test Data:
Input Data: p = 10000, r = 10% , t = 12 year
Expected Output:
Input principle, Rate of interest & time to find simple interest:
Simple interest = 12000
Click me to see the solution

54. Write a C program that accepts a distance in centimeters and prints the corresponding value in inches. Go to the editor
Test Data:
Input Data: 500cms
Input the distance in cm:
Distance of 500.00 cms is = 196.85 inches
Click me to see the solution

55. Write a C program that swaps two numbers without using third variable. Go to the editor
Input value for x & y:
Before swapping the value of x & y: 5 7
After swapping the value of x & y: 7 5
Click me to see the solution

56. Write a C program to shift given data by two bits to the left. Go to the editor
Input value : 2
Read the integer from keyboard-
Integer value = 2
The left shifted data is = 16
Click me to see the solution

57. Write a C program to reverse and print a given number. Go to the editor
Input a number:
The original number = 234
The reverse of the said number = 432
Click me to see the solution

58. Write a C program that accepts 4 real numbers from the keyboard and print out the difference of the maximum and minimum values of these four numbers. Go to the editor
Input four numbers: 1.54 1.236 1.3625 1.002
Difference is 0.5380
Click me to see the solution

59. Write a C program to display sum of series 1 + 1/2 + 1/3 + ………. + 1/n. Go to the editor
Input any number: 1 + 1/0
Sum = 1/0
Click me to see the solution

60. Write a C program to create enumerated data type for 7 days and display their values in integer constants. Go to the editor
Sun = 0
Mon = 1
Tue = 2
Wed = 3
Thu = 4
Fri = 5
Sat = 6
Click me to see the solution

61. Write a C program that accepts a real number x and prints out the corresponding value of sin(1/x) using 4-decimal places. Go to the editor
Input value of x: .6235
Value of sin(1/x) is 0.9995
Click me to see the solution

62. Write a C program that accepts a positive integer less than 500 and prints out the sum of the digits of this number. Go to the editor
Input a positive number less than 500:
Sum of the digits of 347 is 14
Click me to see the solution

63. Write a C program that accepts a positive integer n less than 100 from the user and prints out the sum 14 + 24 + 44 + 74 + 114 + • • • + m4 , where m is less than or equal to n. Print appropriate message. Go to the editor
Input a positive number less than 100: 68
Sum of the series is 37361622
Click me to see the solution

64. Write a C program that accepts integers from the user until a zero or a negative number, display the number of positive values, the minimum value, the maximum value and the average of all numbers. Go to the editor
Input a positive integer:
Input next positive integer: 15
Input next positive integer: 25
Input next positive integer: 37
Input next positive integer: 43
Number of positive values entered is 4
Maximum value entered is 43
Minimum value entered is 15
Average value is 30.0000
Click me to see the solution

65. Write a C program that prints out the prime numbers between 1 and 200. The output should be such that each row contains a maximum of 20 prime numbers. Go to the editor
Expected output:
The prime numbers between 1 and 199 are:
2 3 5 7 11 13 17 19 23 29
31 37 41 43 47 53 59 61 67 71
73 79 83 89 97 101 103 107 109 113
127 131 137 139 149 151 157 163 167 173
179 181 191 193 197
Click me to see the solution

66. Write a C program that generates 50 random numbers between -0.5 and 0.5 and writes them in a file rand.dat. The first line of ran.dat contains the number of data and the next 50 lines contains the 50 random numbers. Go to the editor
50
-0.4215
0.2620
0.3065
-0.0485
.... 0.3980
0.1750
0.4780
-0.2915
0.0715
0.3565
Click me to see the solution

67. Write a C program to evaluate the equation y=xn when n is a non-negative integer. Go to the editor
Input the values of x and n: 256
x=256.000000; n=0;
x to power n=1.000000
Click me to see the solution

68. Write a C program to print the powers of 2 table for the power 0 to 10, both positive and negative. Go to the editor
=======================================
n 2 to power n 2 to power -n
=======================================
0 1 1.000000000000
1 2 0.500000000000
2 4 0.250000000000
3 8 0.125000000000
4 16 0.062500000000
5 32 0.031250000000
6 64 0.015625000000
7 128 0.007812500000
8 256 0.003906250000
9 512 0.001953125000
10 1024 0.000976562500
======================================
Click me to see the solution

69. Write a C program to print a binomial coefficient table. Go to the editor
Mx 0 1 2 3 4 5 6 7 8 9 10
----------------------------------------------------------
0 1
1 1 1
2 1 2 1
3 1 3 3 1
4 1 4 6 4 1
5 1 5 10 10 5 1
6 1 6 15 20 15 6 1
7 1 7 21 35 35 21 7 1
8 1 8 28 56 70 56 28 8 1
9 1 9 36 84 126 126 84 36 9 1
10 1 10 45 120 210 252 210 120 45 10 1
----------------------------------------------------------
Click me to see the solution

70. Write a C program to print the alphabet set in decimal and character form. Go to the editor
[65-A] [66-B] [67-C] [68-D] [69-E] [70-F] [71-G] [72-H] [73-I] [74-J] [75-K] [76-L] [77-M] [78-N] [79-O] [80-P] [81-Q] [82-R] [83-S] [84-T] [85-U] [86-V] [87-W] [88-X] [89-Y]
[90-Z] [97-a] [98-b] [99-c] [100-d] [101-e] [102-f] [103-g] [104-h] [105-i] [106-j] [107-k] [108-l] [109-m] [110-n] [111-o] [112-p] [113-q] [114-r] [115-s] [116-t] [117-u] [118-v]
[119-w] [120-x] [121-y] [122-z]
Click me to see the solution

71. Write a C program to copy a given string into another and count the number of characters copied. Go to the editor
Input a string
Original string: w3resource
Number of characters = 10
Click me to see the solution

72. Write a C program to remove any negative sign in front of a number. Go to the editor
Input a value (negative):
Original value = -253
Absolute value = 253
Click me to see the solution

73. Write a C program that reads in two integers and check whether the first integer is a multiple of the second integer. Go to the editor
Sample Input: 9 3
Sample Output:
Input the first integer : Input the second integer:
9 is a multiple of 3.
Click me to see the solution

74. Write a C program to display the integer equivalents of letters (a-z, A-Z). Go to the editor
Sample Output:
List of integer equivalents of letters (a-z, A-Z).
==================================================
97 98 99 100 101 102
103 104 105 106 107 108
109 110 111 112 113 114
115 116 117 118 119 120
121 122 32 65 66 67
68 69 70 71 72 73
74 75 76 77 78 79
80 81 82 83 84 85
86 87 88 89 90
Click me to see the solution

75. Write a C program that accepts one seven-digit number and separates the number into its individual digits, and prints the digits separated from one another by two spaces each. Go to the editor
Sample Input: 2345678
Input a seven digit number:
Output: 2 3 4 5 6 7 8
Click me to see the solution

76. Write a C program to calculate and prints the squares and cubes of the numbers from 0 to 20 and uses tabs to display them in a table of values. Go to the editor
Sample Output:
Number Square Cube
=========================
0 0 0
1 1 1
2 4 8
3 9 27
.....
18 324 5832
19 361 6859
20 400 8000
Click me to see the solution

77. Write a C program that accepts principal amount, rate of interest and days for a loan and calculate the simple interest for the loan, using the following formula. Go to the editor
interest = principal * rate * days / 365.
Sample Input:
10000
.1
365
0
Sample Output:
Input loan amount (0 to quit): Input interest rate: Input term of the loan in days: The interest amount is $1000.00
Input loan principal_amt (0 to quit):
Click me to see the solution

78. Write a C program to demonstrates the difference between predecrementing and postdecrementing using the decrement operator --. Go to the editor
Sample Output:
Predecrementing:
x = 10
x-- = 10
x = 9
Click me to see the solution

79. Write a C program using looping to produce the following table of values. Go to the editor
Sample Output:

x       x+2     x+4     x+6
--------------------------------
1       3       5       7
4       6       8       10
7       9       11      13
10      12      14      16
13      15      17      19
Click me to see the solution

80. Write a C program that reads the side (side sizes between 1 and 10 ) of a square and prints square using hash (#) character. Go to the editor
Sample Input: 10
Sample Output:

Input the size of the square: 
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
 # # # # # # # # # #
Click me to see the solution

81. Write a C program that reads the side (side sizes between 1 and 10 ) of a square and prints a hollow square using hash (#) character. Go to the editor
Sample Input: 10
Sample Output:

Input the size of the square: 
##########
#        #
#        #
#        #
#        #
#        #
#        #
#        #
#        #
##########
Click me to see the solution

82. Write a C program that reads in a five-digit integer and determines whether or not it’s a palindrome. Go to the editor
Sample Input: 33333
Sample Output:

Input a five-digit number: 33333 is a palindrome.
Click me to see the solution

83. Write a C program which reads an integer (7 digits or fewer) and count number of 3s in the given number. Go to the editor
Sample Input: 538453
Sample Output:

Input a number: The number of threes in the said number is 2
Click me to see the solution

84. Write a C program to calculate and print the average of some integers. Accept all the values preceding 888. Go to the editor
Sample Input:12
15
24
888
Sample Output:

Input each number on a separate line (888 to exit):

The average value of the said numbers is 17.000000
Click me to see the solution

85. Write a C program to print a table of all the Roman numeral equivalents of the decimal numbers in the range 1 to 50. Go to the editor
Sample Output:

Decimal  Roman
number   numeral
-------------------
1        I
2        II
3        III
4        IV
.....
98        LXXXXVIII
99        LXXXXIX
100        C
Click me to see the solution

86. Write a C program to display the sizes and ranges for each of C's data types. Go to the editor
Sample Output:

Size of C data types:

Type               Bytes

--------------------------------
char                 1
int8_t               1
unsigned char        1
uint8_t              1
short                2
int16_t              2
uint16t              2
int                  4
unsigned             4
long                 8
unsigned long        8
int32_t              4
uint32_t             4
long long            8
int64_t              8
unsigned long long   8
uint64_t             8
float                4
double               8
long double          16
_Bool                1
Click me to see the solution

87. Write a C program to display the sizes and ranges for each of C's data types. Go to the editor
Sample Output:

Ranges for integer data types in C

------------------------------------------------------------
int8_t                    -128                   127
int16_t                 -32768                 32767
int32_t            -2147483648            2147483647
int64_t   -9223372036854775808   9223372036854775807
uint8_t                      0                   255
uint16_t                     0                 65535
uint32_t                     0            4294967295
uint64_t                     0  18446744073709551615

============================================================

Ranges for real number data types in C

------------------------------------------------------------
float          1.175494e-38    3.402823e+38
double        2.225074e-308   1.797693e+308
long double  3.362103e-4932  1.189731e+4932
Click me to see the solution

88. Write a C program to create an extended ASCII table. Print the ASCII values 32 through 255. Go to the editor
Sample Output:

|---------------------------------------------------------------------------------------------------------|
|extended ASCII table - excluding control characters                                                      |
|   Ch Dec  Hex  |  Ch Dec  Hex   | Ch Dec  Hex | Ch Dec  Hex  | Ch Dec  Hex  | Ch Dec  Hex | Ch Dec  Hex |
|----------------|----------------|-------------|--------------|--------------|-------------|-------------|
|   har  32 0x20 |  @har  64 0x40 |  `  96 0x60 |  � 128 0x80 |  � 160 0xa0 |  � 192 0xc0 |  � 224 0xe0 |
|  !har  33 0x21 |  Ahar  65 0x41 |  a  97 0x61 |  � 129 0x81 |  � 161 0xa1 |  � 193 0xc1 |  � 225 0xe1 |
|  "har  34 0x22 |  Bhar  66 0x42 |  b  98 0x62 |  � 130 0x82 |  � 162 0xa2 |  � 194 0xc2 |  � 226 0xe2 |
|  #har  35 0x23 |  Char  67 0x43 |  c  99 0x63 |  � 131 0x83 |  � 163 0xa3 |  � 195 0xc3 |  � 227 0xe3 |
|  $har  36 0x24 |  Dhar  68 0x44 |  d 100 0x64 |  � 132 0x84 |  � 164 0xa4 |  � 196 0xc4 |  � 228 0xe4 |
|  %har  37 0x25 |  Ehar  69 0x45 |  e 101 0x65 |  � 133 0x85 |  � 165 0xa5 |  � 197 0xc5 |  � 229 0xe5 |
|  &har  38 0x26 |  Fhar  70 0x46 |  f 102 0x66 |  � 134 0x86 |  � 166 0xa6 |  � 198 0xc6 |  � 230 0xe6 |
|  'har  39 0x27 |  Ghar  71 0x47 |  g 103 0x67 |  � 135 0x87 |  � 167 0xa7 |  � 199 0xc7 |  � 231 0xe7 |
|  (har  40 0x28 |  Hhar  72 0x48 |  h 104 0x68 |  � 136 0x88 |  � 168 0xa8 |  � 200 0xc8 |  � 232 0xe8 |
|  )har  41 0x29 |  Ihar  73 0x49 |  i 105 0x69 |  � 137 0x89 |  � 169 0xa9 |  � 201 0xc9 |  � 233 0xe9 |
|  *har  42 0x2a |  Jhar  74 0x4a |  j 106 0x6a |  � 138 0x8a |  � 170 0xaa |  � 202 0xca |  � 234 0xea |
|  +har  43 0x2b |  Khar  75 0x4b |  k 107 0x6b |  � 139 0x8b |  � 171 0xab |  � 203 0xcb |  � 235 0xeb |
|  ,har  44 0x2c |  Lhar  76 0x4c |  l 108 0x6c |  � 140 0x8c |  � 172 0xac |  � 204 0xcc |  � 236 0xec |
|  -har  45 0x2d |  Mhar  77 0x4d |  m 109 0x6d |  � 141 0x8d |  � 173 0xad |  � 205 0xcd |  � 237 0xed |
|  .har  46 0x2e |  Nhar  78 0x4e |  n 110 0x6e |  � 142 0x8e |  � 174 0xae |  � 206 0xce |  � 238 0xee |
|  /har  47 0x2f |  Ohar  79 0x4f |  o 111 0x6f |  � 143 0x8f |  � 175 0xaf |  � 207 0xcf |  � 239 0xef |
|  0har  48 0x30 |  Phar  80 0x50 |  p 112 0x70 |  � 144 0x90 |  � 176 0xb0 |  � 208 0xd0 |  � 240 0xf0 |
|  1har  49 0x31 |  Qhar  81 0x51 |  q 113 0x71 |  � 145 0x91 |  � 177 0xb1 |  � 209 0xd1 |  � 241 0xf1 |
|  2har  50 0x32 |  Rhar  82 0x52 |  r 114 0x72 |  � 146 0x92 |  � 178 0xb2 |  � 210 0xd2 |  � 242 0xf2 |
|  3har  51 0x33 |  Shar  83 0x53 |  s 115 0x73 |  � 147 0x93 |  � 179 0xb3 |  � 211 0xd3 |  � 243 0xf3 |
|  4har  52 0x34 |  Thar  84 0x54 |  t 116 0x74 |  � 148 0x94 |  � 180 0xb4 |  � 212 0xd4 |  � 244 0xf4 |
|  5har  53 0x35 |  Uhar  85 0x55 |  u 117 0x75 |  � 149 0x95 |  � 181 0xb5 |  � 213 0xd5 |  � 245 0xf5 |
|  6har  54 0x36 |  Vhar  86 0x56 |  v 118 0x76 |  � 150 0x96 |  � 182 0xb6 |  � 214 0xd6 |  � 246 0xf6 |
|  7har  55 0x37 |  Whar  87 0x57 |  w 119 0x77 |  � 151 0x97 |  � 183 0xb7 |  � 215 0xd7 |  � 247 0xf7 |
|  8har  56 0x38 |  Xhar  88 0x58 |  x 120 0x78 |  � 152 0x98 |  � 184 0xb8 |  � 216 0xd8 |  � 248 0xf8 |
|  9har  57 0x39 |  Yhar  89 0x59 |  y 121 0x79 |  � 153 0x99 |  � 185 0xb9 |  � 217 0xd9 |  � 249 0xf9 |
|  :har  58 0x3a |  Zhar  90 0x5a |  z 122 0x7a |  � 154 0x9a |  � 186 0xba |  � 218 0xda |  � 250 0xfa |
|  ;har  59 0x3b |  [har  91 0x5b |  { 123 0x7b |  � 155 0x9b |  � 187 0xbb |  � 219 0xdb |  � 251 0xfb |
|  <har  60 0x3c |  \har  92 0x5c |  | 124 0x7c |  � 156 0x9c |  � 188 0xbc |  � 220 0xdc |  � 252 0xfc |
|  =har  61 0x3d |  ]har  93 0x5d |  } 125 0x7d |  � 157 0x9d |  � 189 0xbd |  � 221 0xdd |  � 253 0xfd |
|  >har  62 0x3e |  ^har  94 0x5e |  ~ 126 0x7e |  � 158 0x9e |  � 190 0xbe |  � 222 0xde |  � 254 0xfe |
|  ?har  63 0x3f |  _har  95 0x5f |DEL 127 0x7f |  � 159 0x9f |  � 191 0xbf |  � 223 0xdf |  � 255 0xff |
Click me to see the solution

89. Write a C programming to calculate (x + y + z) for each pair of integers x, y and z where -2^31 <= x, y, z<= 2^31-1. Go to the editor
Sample Output:

Result: 140733606875472
Click me to see the solution

90. Write a C program to find all prime palindromes in the range of two given numbers x and y (5 <= x<y<= 1000,000,000). Go to the editor
A number is called prime palindrome if the number is both a prime number and a palindrome.
Sample Output:

Input two numbers (separated by a space):
List of prime palindromes:
0
1
Click me to see the solution

91. Write a C program to find the angle between (12:00 to 11:59) the hour hand and the minute hand of a clock. Go to the editor
The hour hand and the minute hand is always among 0 degree and 180 degree. For example, when it's 12 o'clock, the angle of the two hands is 0 while 3:00 is 45 degree and 6:00 is 180 degree.
Sample Output:

Input hour(h) and minute(m) (separated by a space):
The angle is -23076408.0 degrees at 0:4195776.
Click me to see the solution

92. Write a C program to find the last non-zero digit of the factorial of a given positive integer. Go to the editor
For example for 5!, the output will be "2" because 5! = 120, and 2 is the last nonzero digit of 120
Sample Output:

Input a positive number:
The last non-zero digit of the said factorial:
0
Click me to see the solution

93. Write a C program to check if a given number is nearly prime or not. Go to the editor
Nearly prime number is a positive integer which is equal to product of two prime numbers.
Sample Output:

It is not a Nearly prime number.
Click me to see the solution

94. Write a C program to calculate body mass index and display the grade. Go to the editor
Sample Output:

Input the weight: 65
Input the height: 5.6
BMI = 2.072704

Grade: Under 
Click me to see the solution

95. Write a C program to print the corresponding Fahrenheit to Celsius and Celsius to Fahrenheit. Go to the editor
Both cases initial tempratue = 00, maximum temperature = 1500 and step 100
Sample Output:

Fahrenheit to Celsius
---------------------
Fahrenheit  Celsius
   0.0 	     32.0
  10.0 	     50.0
  20.0 	     68.0
...
 130.0 	    266.0
 140.0 	    284.0
 150.0 	    302.0


Celsius to Fahrenheit
---------------------
Celsius   Fahrenheit
   0.0 	    -17.8
  10.0 	    -12.2
  20.0 	     -6.7
 ...

 130.0 	     54.4
 140.0 	     60.0
 150.0 	     65.6
Click me to see the solution

96. Write a C program to count blanks, tabs, and newlines in an input text. Go to the editor
Sample Output:

Number of blanks, tabs, and newlines:
Input few words/tab/newlines
The quick
brown fox jumps
over the lazy dog
^Z
blank=7,tab=2,newline=3
Click me to see the solution

97. Write a C program to replace more than one blanks with a single blank in a input string. Go to the editor
Sample Output:

Input a string and get number of charcters, words and lines:
The quick brown fox jumps over the lazy dog
^Z

Number of Characters = 44
Number of words = 9
Number of lines = 1
Click me to see the solution

98. Write a C program which accepts some text from the user and prints each word of that text in separate line. Go to the editor
Sample Output:

Input some text:
The quick brown fox jumps over the lazy dog
The
quick
brown
fox
jumps
over
the
lazy
dog
Click me to see the solution

99. Write a C program that takes some integer values from the user and print a histogram. Go to the editor
Sample Output:

Input number of histogram bar (Maximum 10):
4
Input the values between 0 and 10 (separated by space):
9
7
4
3


Histogram:
#########
#######
####
###
Click me to see the solution

100. Write a C program to convert a currency value (floating point with two decimal places) to possible number of notes and coins. Go to the editor
Sample Output:

Input the currency value (floating point with two decimal places):
10357.75

Currency Notes:
100 number of Note(s): 103
50 number of Note(s): 1
5 number of Note(s): 1
2 number of Note(s): 1

Currency Coins:
.50 number of Coin(s): 1
.25 number of Coin(s): 1
Click me to see the solution

101. There are three given ranges, write a C program that reads a floating-point number and find the range where it belongs from four given ranges. Go to the editor
Sample Output:

Input a number: 87
Range (80,100]
Click me to see the solution

102. Write a C program that reads three integers and sort the numbers in ascending order. Print the original numbers and sorted numbers. Go to the editor
Sample Output:

Input 3 integers: 17
-5
25

---------------------------
Original numbers: 17, -5, 25
Sorted numbers: -5, 17, 25
Click me to see the solution

103. Write a C program that takes two integers and test whether they are multiplies are not. Go to the editor
In science, a multiple is the product of any quantity and an integer. In other words, for the quantities a and b, we say that b is a multiple of a if b = na for some integer n, which is called the multiplier. If a is not zero, this is equivalent to saying that b/a is an integer.
Sample Output:

Input two integers:
3
9
Multiplies
Click me to see the solution

104. Write a C program that read the item’s price and create new item price and increased price of that item according to the item price table. Go to the editor
Sample Output:

Input the item price:525
New Item price: 582.75
Increased price: 57.75
Increase Percentage: 11%
Click me to see the solution

105. Write a C program that accepts seven floating point numbers and count the number of positive and negative numbers. Also print the average of all positive and negative values with two digit after the decimal number. Go to the editor
Sample Output:

Input 7 numbers(int/float):
25
35.75
15
-3.5
40
35
16

6 Number of positive numbers: Average 27.79

1 Number of negative numbers: Average -3.50
Click me to see the solution

106. Write a C program that accepts 7 integer values and count the even, odd, positive and negative values. Go to the editor
Sample Output:

Input 7 integers:
10
12
15
-15
26
35
17

Number of even values: 3
Number of odd values: 4
Number of positive values: 6
Number of negative values: 1
Click me to see the solution

107. Write a C program that accepts an integer and print next ten consecutive odd and even numbers. Go to the editor
Sample Output:

Input an integer number:
15

Next 10 consecutive odd numbers:
17, 19, 21, 23, 25, 27, 29, 31, 33, 35,

Next 10 consecutive even numbers:
26, 28, 30, 32, 34, 36, 38, 40, 42, 44,
Click me to see the solution

108. Write a C program that reads two integer values and calculate the sum of all odd and values between them. Go to the editor
Sample Output:

Input the first integer number:
25
Input the second integer number (greater than first integer):
45
Sum of all odd values between 25 and 45:
385
Sum of all even values between 25 and 45:
350
Click me to see the solution

109. Write a C program to find and print the square of each even and odd values between 1 and a given number (4 < n < 101). Go to the editor
Sample Output:

Input a number(integer): 15

Square of each even between 1 and 15:
2^2 = 4
4^2 = 16
6^2 = 36
8^2 = 64
10^2 = 100
12^2 = 144
14^2 = 196

Square of each odd between 1 and 15:
1^2 = 1
3^2 = 9
5^2 = 25
7^2 = 49
9^2 = 81
11^2 = 121
13^2 = 169
15^2 = 225
Click me to see the solution

110. Write a C program to find the odd, even, positive and negative number form a given number(integer) and print a message 'Number is positive odd' or 'Number is negative odd' or 'Number is positive even' or 'Number is negative even'. If the number is 0 print “Zero”. Go to the editor
Sample Output:

Input a number (integer):
12
Number is positive-even
Click me to see the solution

111. Write a C program that accepts an integer from the user and divide all numbers between 1 and 100. Print those numbers where remainder value is 3. Go to the editor
Sample Output:

Input a number (integer):
65

Remainder value is 3 after divide all numbers between 1 and 100 by 65:
3
68
Click me to see the solution

112. Write a C program that reads seven integer values from the user and find the highest value and it’s position. Go to the editor
Sample Output:

Input 6 numbers (integer values):
15
20
25
17
-8
35

Maximum value: 35
Position: 6
Click me to see the solution

113. Write a C program to create and print the sequence of the following example. Go to the editor
Sample Output:

a=1      b=100
a=6      b=90
a=11     b=80
a=16     b=70
a=21     b=60
a=26     b=50
a=31     b=40
a=36     b=30
a=41     b=20
a=46     b=10
a=51     b=0
Click me to see the solution

114. Write a C program that accepts two integers values and calculate the sum of all even values between them, exclusive input values. Go to the editor
Sample Output:

Input two numbers (integer values):
25
45

Sum of all even values between 25 and 45
350

Sample Output:

Input two numbers (integer values):
27
13

Sum of all even values between 27 and 13
140
Click me to see the solution

115. Write a C program that accepts a pair of numbers from the user and print the sequence from the lowest to highest number. Also, print the average value of the sequence. Go to the editor

Sample Output:

Input two pairs values (integer values):
14
25

Sequence from the lowest to highest number:
14 15 16 17 18 19 20 21 22 23 24 25
Average value of the said sequence
    19.50

Sample Output:

Input two pairs values (integer values):
35
13

Sequence from the lowest to highest number:
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
Average value of the said sequence
    24.00
Click me to see the solution

116. Write a C program that accepts a pair of numbers from the user and prints "Ascending order" if the two numbers are in ascending order, otherwise prints, "Descending order". Go to the editor

Sample Output:

Input two pairs values (integer values):
12
35
Ascending order

Sample Output:

Input two pairs values (integer values):
65
25
Descending order
Click me to see the solution

117. Write a C program that read two integers and dividing the first number by second, print the result of this division with two digits after the decimal point and print "Division not possible..!" if the division is not possible. Go to the editor

Sample Output:

Input two integer values:
75
5
Result: 15.00
Click me to see the solution

118. Write a C program that reads five subject marks (0-100) of a student and calculate the average of these marks. Go to the editor

Sample Output:

Input five subject marks(0-100):
75
84
56
98
68
Average marks = 76.20
Click me to see the solution

119. Write a C program to calculate the sum all numbers between two given numbers (inclusive) not divisible by 7. Go to the editor

Sample Output:

Input two numbers(integer):
25
5
Sum of all numbers between said numbers (inclusive) not divisible by 7:
273

Sample Output:

Input two numbers(integer):
6
36
Sum of all numbers between said numbers (inclusive) not divisible by 7:
546
Click me to see the solution

120. Write a C program to print a sequence from 1 to a given (integer) number, insert a comma between these numbers, there will be no comma after the last character. Go to the editor

Sample Output:

Input a number(integer):
25
Sequence:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25
Click me to see the solution

121. Write a C program that reads an integer and find all the divisors of the said integer. Go to the editor

Sample Output:

Input a number (integer value):
35

All positive divisors of 35
1
5
7
35
Click me to see the solution

122. Write a C program that reads two integers m, n and compute the sum of n even numbers starting from m. Go to the editor

Sample Output:

Input two integes (m, n):
20
60

Sum of 60 even numbers starting from 20:
4740
Click me to see the solution

123. Write a C program that reads two integers m, n and compute the sum of n odd numbers starting from m. Go to the editor

Sample Output:

Input two integes (m, n):
65
5

Sum of 5 odd numbers starting from 65:
345
Click me to see the solution

124. Write a C program that reads an array of integers (length 7), replace every negative or null element by 1 and print the array elements. Go to the editor

Sample Output:

Input 7 array elements:
15
12
-7
25
0
27
53

Array elements:
array_nums[0] = 15
array_nums[1] = 12
array_nums[2] = 1
array_nums[3] = 25
array_nums[4] = 1
array_nums[5] = 27
array_nums[6] = 53
Click me to see the solution

125. Write a C program that reads an array of integers (length 7), and replace the first element of the array by a give number and replace each subsequent position of the array by the double value of the previous. Go to the editor

Sample Output:

Input the first element of the array:
5

Array elements:
array_nums[0] = 5
array_nums[1] = 10
array_nums[2] = 20
array_nums[3] = 40
array_nums[4] = 80
array_nums[5] = 160
array_nums[6] = 320
Click me to see the solution

126. Write a C program that reads an array (length 7) and print all array positions that store a value less or equal to 0. Go to the editor

Sample Output:

Input 7 array elements:
15
23
37
65
20
-7
65

Array positions that store a value less or equal to 0:
array_nums[5] = -7.0
Click me to see the solution

127. Write a C program that reads an array of integers (length 8), replace the 1st element by the 8th, 2nd by the 7th and so on. Print the final array. Go to the editor

Sample Output:

Input 8 array elements:
25
35
17
-5
29
45
60
65

Modified array:
array_nums[0] = 65
array_nums[1] = 60
array_nums[2] = 45
array_nums[3] = 29
array_nums[4] = -5
array_nums[5] = 17
array_nums[6] = 35
array_nums[7] = 25
Click me to see the solution

128. Write a C program that reads an array of integers (length 10), fill the array elements with number o to a (given number) n – 1 repeated times where 2 <= n <= 10. Go to the editor

Sample Output:

Input an integer (2-10)
8
array_nums[0] = 0
array_nums[1] = 1
array_nums[2] = 2
array_nums[3] = 3
array_nums[4] = 4
array_nums[5] = 5
array_nums[6] = 6
array_nums[7] = 7
array_nums[8] = 0
array_nums[9] = 1
Click me to see the solution

129. Write a C program that reads an array (length 10), and replace the first element of the array by a give number and replace each subsequent position of the array by one-third value of the previous. Go to the editor

Sample Output:

Input an integer (2-10)
8
array_nums[0] = 0
array_nums[1] = 1
array_nums[2] = 2
array_nums[3] = 3
array_nums[4] = 4
array_nums[5] = 5
array_nums[6] = 6
array_nums[7] = 7
array_nums[8] = 0
array_nums[9] = 1
Click me to see the solution

130. Write a C program to create an array of length n and fill the array elements with integer values. Now find the smallest value and it’s position within the array. Go to the editor

Sample Output:

Input a number:
35

Array elements:
array_nums[0] = 35.0000
array_nums[1] = 11.6667
array_nums[2] = 3.8889
array_nums[3] = 1.2963
array_nums[4] = 0.4321
array_nums[5] = 0.1440
array_nums[6] = 0.0480
array_nums[7] = 0.0160
array_nums[8] = 0.0053
array_nums[9] = 0.0018
Click me to see the solution

131. Write a C program that accepts two strings and check whether the second string present in the last part of the first string. Go to the editor

Sample Output:

Input the first string:
abcdef
Input the second string:
ef
Is second string present in the last part of the first string?
Present!
Click me to see the solution

132. Write a Java program to find heights of the top three building in descending order from eight given buildings. Go to the editor
Input:
0 <= height of building (integer) <= 10,000

Sample Output:

Input heights(integer values) of the top eight buildings:
25
15
45
22
35
18
95
65

Heights of the top three building:
95
65
45
Click me to see the solution

133. Write a C program to calculate the sum of two given integers and count the number of digits of the sum value. Go to the editor

Sample Output:

Input two integer values:
68
75

Number of digits of the sum value of the said numbers:
3
Click me to see the solution

134. Write a C program to check whether three given lengths (integers) of three sides of a triangle form a right triangle or not. Print "Yes" if the given sides form a right triangle otherwise print "No". Go to the editor
Input:
Integers separated by a single space.
1 <= length of the side <= 1,000

Sample Output:

Input the three sides of a trainagel:
12
11
13
It is not a right angle triangle!
Click me to see the solution

135. Write a C program which reads an integer n and find the number of combinations of a, b, c and d (0 <= a, b, c, d <= 9) where (a + b + c + d) will be equal to n. Go to the editor
Input:
n (1 <= n <= 50)

Sample Output:

Input a number:
5

a + b + c + d = n
0, 0, 0, 5
0, 0, 1, 4
....
4, 0, 1, 0
4, 1, 0, 0
5, 0, 0, 0

Total number of combinations:
56
Click me to see the solution

136. Write a C program to find the prime numbers which are less than or equal to a given integer. Go to the editor
Input:
n (1 <= n <= 999,999)

Sample Output:

Input a number:
123
Number of prime numbers which are less than or equal to 123
30
Click me to see the solution

137. Write a C program to check if a point (x, y) is within a triangle or not. The triangle has formed by three points. Go to the editor
Input:
x1,y1,x2,y2,x3,y3,xp,yp separated by a single space

Sample Output:

Input three points to form a triangle:
x1 y1 z1

Input the point to check it is inside the triangle or not:
The point is outside the triangle!
Click me to see the solution

138. Write a C program to test whether two lines are parallel or not. The four points are P(x1, y1), Q(x2, y2), R(x3, y3) and S(x4, y4), check PQ and RS are parallel are not. Go to the editor
Input:
−100 <= x1, y1, x2, y2, x3, y3, x4, y4 <= 100
Each value is a real number with at most 5 digits after the decimal point.

Sample Output:

Input P(x1,y1):
5
7

Input P(x2,y2):
3
6

Input P(x3,y3):
8
9

Input P(x4,y4):
5
6

PQ and RS are not parallel!
Click me to see the solution

139. Write a C program to find the maximum sum of a contiguous subsequence from a given sequence of numbers a1, a2, a3, ... an ( n = number of terms in the sequence). Go to the editor
Input:
You can assume that 1 <= n <= 500 and -10000 <= ai <= 10000.

Sample Output:

Input number of terms in the sequence:
5

Input the terms of the said sequence:
3
2
6
-7
8
Maximum sum of a contiguous subsequence:
12
Click me to see the solution

140. Write a C program to which reads a sequence of integers and find the element which occurs most frequently. Go to the editor

Sample Output:

Input the terms of the sequence:
5
2
4
6
8
10
^Z
Mode values of the said sequence in ascending order:
2
4
5
6
8
10
Click me to see the solution

141. Write a C program that reads n digits (given) chosen from 0 to 9 and prints the number of combinations where the sum of the digits equals to another given number (s). Do not use the same digits in a combination. Go to the editor
For example, the combinations where n = 3 and s = 6 are as follows:
1 + 2 + 3 = 6
0 + 1 + 5 = 6
0 + 2 + 4 = 6

Sample Output:

Input the number:
3

Sum of the digits:
6
Number of combinations: 3
Click me to see the solution

142. Write a C program which reads the two adjoined sides and the diagonal of a parallelogram and check whether the parallelogram is a rectangle or a rhombus. Go to the editor
Input:
Two adjoined sides and the diagonal.
1 <= ai, bi, ci <= 1000, ai + bi > ci

Sample Output:

Input two adjoined sides of the parallelogram:
3
4

Input the diagonal of the parallelogram:
5

This is a rectangle.

Sample Output:

Input two adjoined sides of the parallelogram:
5
5

Input the diagonal of the parallelogram:
7

This is a rhombus.
Click me to see the solution

143. Write a C program to find the difference between the largest integer and the smallest integer, which are created by 8 numbers from 0 to 9. The number that can be rearranged shall start with 0 as in 00135668. Go to the editor
Input:
Data is a sequence of 8 numbers (digits from 0 to 9).
Output:
The difference between the largest integer and the smallest integer.

Sample Output:

Input an integer created by 8 numbers (0 to 9):
25346879

The difference between the largest integer and the smallest integer.
98765432 - 23456789 = 75308643
Click me to see the solution

144. Write a C program to create maximum number of regions obtained by drawing n given straight lines. Go to the editor
Input:
(1 ≤ n ≤ 10,000).

Sample Output:

Input number of straight lines:
2
Maximum number of regions obtained by drawing 2 given straight lines:
4
Click me to see the solution

145. Write a C program to sum of all numerical values (positive integers) embedded in a sentence. Go to the editor
Input:
Sentences with positive integers are given over multiple lines. Each line is a character string containing one-byte alphanumeric characters, symbols, spaces, or an empty line. However the input is 80 characters or less per line and the sum is 10,000 or less.

Sample Output:

Input Sentences with positive integers:
5littleJackand2mouse.

Sum of all numerical values embedded in a sentence:
7
Click me to see the solution

146. Write a C program to extract words of 3 to 6 characters length from a given sentence not more than 1024 characters. Go to the editor
Input:
English sentences consisting of delimiters and alphanumeric characters are given on one line.

Sample Output:

English sentences consisting of delimiters and alphanumeric characters on one line:
w3resource.com

Extract words of 3 to 6 characters length from the said sentence:
com
Click me to see the solution

147. Write a C program to find the number of combinations that satisfy p + q + r + s = n where n is a given number <= 4000 and p, q, r, s in the range of 0 to 1000. Go to the editor

Sample Output:

Input a positive integer:
25

Number of combinations of p,q,r,s:
3276
Click me to see the solution

148. Write a C program, which adds up columns and rows of given table as shown in the following figure. Go to the editor

Input:
n (the size of row and column of the given table)
1st row of the table
2nd row of the table
:
:
n th row of the table
The input ends with a line consisting of a single 0.

Sample Output:

Input number of rows/columns:
4
Input the cell value

Row 0 input cell values
25
69
51
26

Row 1 input cell values
68
35
29
54

Row 2 input cell values
54
57
45
63

Row 3 input cell values
61
68
47
59

Result:
   25   69   51   26  171
   68   35   29   54  186
   54   57   45   63  219
   61   68   47   59  235
  208  229  172  202  811
Click me to see the solution

149. Write a C program, which reads a list of pairs of a word and a page number, and prints the word and a list of the corresponding page numbers. Go to the editor
Input:
word page_number
Output:
word
a_list_of_the_page_number
word
a_list_of_the_Page_number.

Sample Output:

Input pairs of a word and a page_no number:
Twinkle
65
Twinkle
55
Little
25
Star
35
^Z

Word and page_no number in alphabetical order:
Little
25
Star
35
Twinkle
55 65
Click me to see the solution

150. Write a C program that reads an expression and evaluates it. Go to the editor
Input:
4
10-2*3=
8*(8+2-5)=

Sample Output:

Input an expression using +, -, *, / operators:
1+6*8-4/2
47

Sample Output:

Input an expression using +, -, *, / operators:
25/5-6*7+2
-35

Sample Output:

Input an expression using +, -, *, / operators:
9+6+(5*2)-5
20
Click me to see the solution

C programming Code Editor:

More to Come !

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



C Programming: Tips of the Day

Which is faster: x<<1 or x<<10?

Potentially depends on the CPU.

However, all modern CPUs (x86, ARM) use a "barrel shifter" -- a hardware module specifically designed to perform arbitrary shifts in constant time.

So the bottom line is... no. No difference.

Ref : https://bit.ly/3fQdlJ5