# C Basic: Exercises, Practice, Solution

## C Basic Declarations and Expressions [85 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

**2.** 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. Go to the editor

*Expected Output*:

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

**3.** Write a C program to print a big 'C'. Go to the editor

*Expected Output*:

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

**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 radius of 6 inches. 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 *Variable*s :

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 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

**22.** 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 integer: 5

Input the second integer: 15

Input the third integer: 10

Expected Output:

Numbers in sorted order: 5 10 15

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 if 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 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 print the numbers from the lowest to the highest (inclusive) and the sum of consecutive integers from a given pair of numbers. 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 if 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 dividing it 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 b 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 1^{4} + 2^{4} + 4^{4} + 7^{4} + 11^{4} + • • • + m^{4} , 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 programming 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 programming 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 programming 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 programming 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 programming 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 programming 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 programming 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 19Click me to see the solution

**80.** Write a C programming 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 programming 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 programming Write a 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 programming 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 2Click me to see the solution

**84.** Write a C programming 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 17.000000Click me to see the solution

**85.** Write a C programming 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 CClick me to see the solution

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