 # C# Sharp For Loop : Exercises, Practice, Solution

## C# Sharp For Loop [83 exercises with solution]

1. Write a program in C# Sharp to display the first 10 natural numbers. Go to the editor
Expected Output :
1 2 3 4 5 6 7 8 9 10
Click me to see the solution

2. Write a C# Sharp program to find the sum of first 10 natural numbers. Go to the editor
Expected Output :
The first 10 natural number is :
1 2 3 4 5 6 7 8 9 10
The Sum is : 55
Click me to see the solution

3. Write a program in C# Sharp to display n terms of natural number and their sum.Go to the editor
Test Data : 7
Expected Output :
The first 7 natural number is :
1 2 3 4 5 6 7
The Sum of Natural Number upto 7 terms : 28
Click me to see the solution

4. Write a program in C# Sharp to read 10 numbers from keyboard and find their sum and average. Go to the editor
Test Data :
Input the 10 numbers :
Number-1 :2
...
Number-10 :2
Expected Output :
The sum of 10 no is : 51
The Average is : 5.100000
Click me to see the solution

5. Write a program in C# Sharp to display the cube of the number up to given an integer. Go to the editor
Test Data :
Input number of terms : 5
Expected Output :
Number is : 1 and cube of the 1 is :1
Number is : 2 and cube of the 2 is :8
Number is : 3 and cube of the 3 is :27
Number is : 4 and cube of the 4 is :64
Number is : 5 and cube of the 5 is :125
Click me to see the solution

6. Write a program in C# Sharp to display the multiplication table of a given integer. Go to the editor
Test Data :
Input the number (Table to be calculated) : 15
Expected Output :
15 X 1 = 15
...
...
15 X 10 = 150
Click me to see the solution

7. Write a program in C# Sharp to display the multiplication table vertically from 1 to n. Go to the editor
Test Data :
Input upto the table number starting from 1 : 8
Expected Output :
Multiplication table from 1 to 8
1x1 = 1, 2x1 = 2, 3x1 = 3, 4x1 = 4, 5x1 = 5, 6x1 = 6, 7x1 = 7, 8x1 = 8
...
1x10 = 10, 2x10 = 20, 3x10 = 30, 4x10 = 40, 5x10 = 50, 6x10 = 60, 7x10 = 70, 8x10 = 80
Click me to see the solution

8. Write a program in C# Sharp to display the n terms of odd natural number and their sum. Go to the editor
Test Data
Input number of terms : 10
Expected Output :
The odd numbers are :1 3 5 7 9 11 13 15 17 19
The Sum of odd Natural Number upto 10 terms : 100
Click me to see the solution

9. Write a program in C# Sharp to display the pattern like right angle triangle using an asterisk. Go to the editor
The pattern like :

```*
**
***
****
```

10. Write a program in C# Sharp to display the pattern like right angle triangle with a number. Go to the editor
The pattern like :

```1
12
123
1234
```

11. Write a program in C# Sharp to make such a pattern like right angle triangle with a number which will repeat a number in a row. Go to the editor
The pattern like :

```1
22
333
4444
```

Click me to see the solution

12. Write a program in C# Sharp to make such a pattern like right angle triangle with number increased by 1. Go to the editor
The pattern like :

```1
2 3
4 5 6
7 8 9 10
```

Click me to see the solution

13. Write a program in C# Sharp to make such a pattern like a pyramid with numbers increased by 1. Go to the editor

```   1
2 3
4 5 6
7 8 9 10
```

Click me to see the solution

14. Write a program in C# Sharp to make such a pattern like a pyramid with an asterisk. Go to the editor

```   *
* *
* * *
* * * *
```

Click me to see the solution

15. Write a C# Sharp program to calculate the factorial of a given number. Go to the editor
Test Data :
Input the number : 5
Expected Output :
The Factorial of 5 is: 120
Click me to see the solution

16. Write a program in C# Sharp to display the n terms of even natural number and their sum. Go to the editor
Test Data :
Input number of terms : 5
Expected Output :
The even numbers are :2 4 6 8 10
The Sum of even Natural Number upto 5 terms : 30
Click me to see the solution

17. Write a program in C# Sharp to make such a pattern like a pyramid with a number which will repeat the number in the same row. Go to the editor

```   1
2 2
3 3 3
4 4 4 4
```

Click me to see the solution

18. Write a program in C# Sharp to find the sum of the series [ 1-X^2/2!+X^4/4!- .........]. Go to the editor
Test Data :
Input the Value of x :2
Input the number of terms : 5
Expected Output :
the sum = -0.415873
Number of terms = 5
value of x = 2.000000
Click me to see the solution

19. Write a program in C# Sharp to display the n terms of harmonic series and their sum. Go to the editor
1 + 1/2 + 1/3 + 1/4 + 1/5 ... 1/n terms
Test Data :
Input the number of terms : 5
Expected Output :
1/1 + 1/2 + 1/3 + 1/4 + 1/5 +
Sum of Series upto 5 terms : 2.283334
Click me to see the solution

20. Write a program in C# Sharp to display the pattern like pyramid using an asterisk and each row contain an odd number of an asterisks. Go to the editor

```  *
***
*****
```

Click me to see the solution

21. Write a program in C# Sharp to display the sum of the series [ 9 + 99 + 999 + 9999 ...]. Go to the editor
Test Data :
Input the number or terms :5
Expected Output :
9 99 999 9999 99999
The sum of the series = 111105
Click me to see the solution

22. Write a program in C# Sharp to print the Floyd's Triangle. Go to the editor

```1
01
101
0101
10101
```

Click me to see the solution

23. Write a program in C# Sharp to display the sum of the series [ 1+x+x^2/2!+x^3/3!+....]. Go to the editor
Test Data :
Input the value of x :3
Input number of terms : 5
Expected Output :
The sum is : 16.375000
Number of terms = 5
The value of x = 3.000000
Click me to see the solution

24. Write a program in C# Sharp to find the sum of the series [ x - x^3 + x^5 - x^7 + x^9 -.....]. Go to the editor
Test Data :
Input the value of x : 2
Input number of terms : 5
The sum = 410
Number of terms = 5
The value of x = 2
Click me to see the solution

25. Write a program in C# Sharp to display the n terms of square natural number and their sum. Go to the editor
1 4 9 16 ... n Terms
Test Data :
Input the number of terms : 5
Expected Output :
The square natural upto 5 terms are :1 4 9 16 25
The Sum of Square Natural Number upto 5 terms = 55
Click me to see the solution

26. Write a program in C# Sharp to find the sum of the series 1 +11 + 111 + 1111 + .. n terms. Go to the editor
Test Data :
Input the number of terms : 5
Expected Output :
1 + 11 + 111 + 1111 + 11111 +
The Sum is : 12345
Click me to see the solution

27. Write a C# Sharp program to check whether a given number is perfect number or not. Go to the editor
Test Data :
Input the number : 56
Expected Output :
The positive divisor : 1 2 4 7 8 14 28
The sum of the divisor is : 64
So, the number is not perfect.
Click me to see the solution

28. Write a C# Sharp program to find the perfect numbers within a given range of number. Go to the editor
Test Data :
Input the starting range or number : 1
Input the ending range of number : 50
Expected Output :
The Perfect numbers within the given range : 6 28
Click me to see the solution

29. Write a C# Sharp program to check whether a given number is an Armstrong number or not. Go to the editor
Test Data :
Input a number: 153
Expected Output :
153 is an Armstrong number.
Click me to see the solution

30. Write a C# Sharp program to find the Armstrong number for a given range of number. Go to the editor
Test Data :
Input starting number of range: 1
Input ending number of range : 1000
Expected Output :
Armstrong numbers in given range are: 1 153 370 371 407
Click me to see the solution

31. Write a program in C# Sharp to display the pattern like a diamond. Go to the editor

```    *
***
*****
*******
*********
*******
*****
***
*
```

Click me to see the solution

32. Write a C# Sharp program to determine whether a given number is prime or not. Go to the editor
Test Data :
Input a number: 13
Expected Output :
13 is a prime number.
Click me to see the solution

33. Write a C# Sharp program to display by Pascal's triangle. Go to the editor
Test Data :
Input number of rows: 5
Expected Output :

1 1 1 1 2 1 1 3 3 1 1 4 6 4 1

Click me to see the solution

34. Write a program in C# Sharp to find the prime numbers within a range of numbers. Go to the editor
Test Data :
Input starting number of range: 1
Input ending number of range : 50
Expected Output :
The prime number between 1 and 50 are :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47
Click me to see the solution

35. Write a program in C# Sharp to display the first n terms of Fibonacci series. Go to the editor
Fibonacci series 0 1 2 3 5 8 13 .....
Test Data :
Input number of terms to display : 10
Expected Output :
Here is the Fibonacci series upto to 10 terms :
0 1 1 2 3 5 8 13 21 34
Click me to see the solution

36. Write a program in C# Sharp to display the such a pattern for n number of rows using a number which will start with the number 1 and the first and a last number of each row will be 1. Go to the editor

```  1
121
12321
```

Click me to see the solution

37. Write a program in C# Sharp to display the number in reverse order. Go to the editor
Test Data :
Input a number: 12345
Expected Output :
The number in reverse order is : 54321
Click me to see the solution

38. Write a program in C# Sharp to check whether a number is a palindrome or not. Go to the editor
Test Data :
Input a number: 121
Expected Output :
121 is a palindrome number.
Click me to see the solution

39. Write a program in C# Sharp to find the number and sum of all integer between 100 and 200 which are divisible by 9. Go to the editor
Expected Output :
Numbers between 100 and 200, divisible by 9 :
108 117 126 135 144 153 162 171 180 189 198
The sum : 1683
Click me to see the solution

40. Write a C# Sharp Program to display the following pattern using the alphabet. Go to the editor

```A
A B A
A B C B A
A B C D C B A
```

41. Write a program in C# Sharp to convert a decimal number into binary without using an array. Go to the editor
Test Data :
Enter a number to convert : 25
Expected Output :
The Binary of 25 is 11001.
Click me to see the solution

42. Write a program in C# Sharp to convert a binary number into a decimal number without using array, function and while loop. Go to the editor
Test Data :
Input a binary number :1010101
Expected Output :
The Binary Number : 1010101
The equivalent Decimal Number : 85
Click me to see the solution

43. Write a C# Sharp program to find HCF (Highest Common Factor) of two numbers. Go to the editor
Test Data :
Input 1st number for HCF: 24
Input 2nd number for HCF: 28
Expected Output :
HCF of 24 and 28 is : 4
Click me to see the solution

44. Write a program in C# Sharp to find LCM of any two numbers using HCF. Go to the editor
Test Data :
Input 1st number for LCM: 15
Input 2nd number for LCM: 20
Expected Output :
The LCM of 15 and 20 is : 60
Click me to see the solution

45. Write a program in C# Sharp to find LCM of any two numbers. Go to the editor
Test Data :
Input 1st number for LCM: 15
Input 2nd number for LCM: 20
Expected Output :
The LCM of 15 and 20 is : 60
Click me to see the solution

46. Write a program in C# Sharp to convert a binary number into a decimal number using math function. Go to the editor
Test Data :
Input the binary number :1010100
Expected Output :
The Binary Number : 1010100
The equivalent Decimal Number is : 84
Click me to see the solution

47. Write a C# Sharp program to check whether a number is a Strong Number or not. Go to the editor
Test Data :
Input a number to check whether it is Strong number: 15
Expected Output :
15 is not Strong number.
Click me to see the solution

48. Write a C# Sharp program to find Strong Numbers within a range of numbers. Go to the editor
Test Data :
Input starting range of number : 1
Input ending range of number: 200
Expected Output :
The Strong numbers are :
1 2 145
Click me to see the solution

49. Write a C# Sharp program to find out the sum of in A.P. series. Go to the editor
Test Data :
Input the starting number of the A.P. series: 1
Input the number of items for the A.P. series: 10
Input the common difference of A.P. series: 4
Expected Output :
The Sum of the A.P. series are :
1 + 5 + 9 + 13 + 17 + 21 + 25 + 29 + 33 + 37 = 190
Click me to see the solution

50. Write a program in C# Sharp to convert a decimal number into octal without using an array. Go to the editor
Test Data :
Enter a number to convert : 79
Expected Output :
The Octal of 79 is 117.
Click me to see the solution

51. Write a program in C# Sharp to convert an octal number to decimal without using array. Go to the editor
Test Data :
Input an octal number (using digit 0 - 7) :745
Expected Output :
The Octal Number : 745
The equivalent Decimal Number : 485
Click me to see the solution

52. Write a program in C# Sharp to find the Sum of GP series. Go to the editor
Test Data :
Input the first number of the G.P. series: 1
Input the number or terms in the G.P. series: 5
Input the common ratio of G.P. series: 2
Expected Output :
The numbers for the G.P. series:
1 2 4 8 16 32
The tn terms of G.P. : 16.000000
The Sum of the G.P. series : 63.000000
Click me to see the solution

53. Write a program in C# Sharp to convert a binary number to octal. Go to the editor
Test Data :
Input a binary number :1001
Expected Output :
The Binary Number : 1001
The equivalent Octal Number : 11
Click me to see the solution

54. Write a program in C# Sharp to convert an octal number into binary. Go to the editor
Test Data :
Input an octal number :11
Expected Output :
The Octal Number : 11
The equivalent Binary Number : 1001
Click me to see the solution

55. Write a program in C# Sharp to convert a decimal number to hexadecimal. . Go to the editor
Test Data :
Input any Decimal number: 79
Expected Output :
The equivalent Hexadecimal Number : 4F
Click me to see the solution

56. Write a program in C# Sharp to check whether a number can be express as sum of two prime numbers. Go to the editor
Test Data :
Input a positive integer: 16
Expected Output :
16 = 3 + 13
16 = 5 + 11
Click me to see the solution

57. Write a program in C# Sharp to print a string in reverse order. Go to the editor
Test Data :
Input a string to reverse : Welcome
Expected Output :
Reversed string is: emocleW
Click me to see the solution

58. Write a C# Sharp program to display alphabet pattern like A with an asterisk. Go to the editor

```Reversed string is:Display the pattern like 'A' with an asterisk:
---------------------------------------------

***
*   *
*   *
*****
*   *
*   *
*   *
*   *
```

59. Write a C# Sharp program to display alphabet pattern like B with an asterisk. Go to the editor

```Display the pattern like 'B' with an asterisk:
---------------------------------------------

****
*   *
*   *
****
*   *
*   *
****
```

60. Write a C# Sharp program to display alphabet pattern like C with an asterisk. Go to the editor

```Display the pattern like 'C' with an asterisk:
---------------------------------------------

***
*   *
*
*
*
*   *
***
```

61. Write a C# Sharp program to display alphabet pattern like D with an asterisk. Go to the editor

```Display the pattern like 'D' with an asterisk:
---------------------------------------------

****
*   *
*   *
*   *
*   *
*   *
****
```

62. Write a C# Sharp program to display alphabet pattern like E with an asterisk. Go to the editor

```Display the pattern like 'E' with an asterisk:
---------------------------------------------

*****
*
*
****
*
*
*****
```

63. Write a C# Sharp program to display alphabet pattern like F with an asterisk. Go to the editor

```Display the pattern like 'F' with an asterisk:
---------------------------------------------

*****
*
*
****
*
*
*
```

64. Write a C# Sharp program to display alphabet pattern like G with an asterisk. Go to the editor

```Display the pattern like 'G' with an asterisk:
---------------------------------------------

***
*   *
*
* ***
*   *
*   *
***            ```

65. Write a C# Sharp program to display alphabet pattern like H with an asterisk. Go to the editor

```Display the pattern like 'H' with an asterisk:
---------------------------------------------

*   *
*   *
*   *
*****
*   *
*   *
*   * ```

66. Write a C# Sharp program to display alphabet pattern like I with an asterisk. Go to the editor

```Display the pattern like 'I' with an asterisk:
---------------------------------------------

*****
*
*
*
*
*
*****
```

67. Write a C# Sharp program to display alphabet pattern like J with an asterisk. Go to the editor

```Display the pattern like 'J' with an asterisk:
---------------------------------------------

***
*
*
*
*
* *
*
```

Click me to see the solution

68. Write a C# Sharp program to display alphabet pattern like K with an asterisk. Go to the editor

```Display the pattern like 'K' with an asterisk:
---------------------------------------------

*   *
*  *
* *
**
* *
*  *
*   *
```

69. Write a C# Sharp program to display alphabet pattern like L with an asterisk. Go to the editor

```Display the pattern like 'L' with an asterisk:
---------------------------------------------

*
*
*
*
*
*
*****
```

Click me to see the solution

70. Write a C# Sharp program to display alphabet pattern like M with an asterisk. Go to the editor

```Display the pattern like 'M' with an asterisk:
---------------------------------------------

*   *
*   *
** **
* * *
*   *
*   *
*   *
```

Click me to see the solution

71. Write a C# Sharp program to display alphabet pattern like N with an asterisk. Go to the editor

```Display the pattern like 'N' with an asterisk:
---------------------------------------------

*   *
*   *
**  *
* * *
*  **
*   *
*   *
```

Click me to see the solution

72. Write a C# Sharp program to display alphabet pattern like O with an asterisk. Go to the editor

```Display the pattern like 'O' with an asterisk:
---------------------------------------------

***
*   *
*   *
*   *
*   *
*   *
***
```

Click me to see the solution

73. Write a C# Sharp program to display alphabet pattern like P with an asterisk. Go to the editor

```Display the pattern like 'P' with an asterisk:
---------------------------------------------

****
*   *
*   *
****
*
*
*
```

Click me to see the solution

74. Write a C# Sharp program to display alphabet pattern like Q with an asterisk. Go to the editor

```Display the pattern like 'Q' with an asterisk:
---------------------------------------------

***
*   *
*   *
*   *
* * *
*  *
** *
```

Click me to see the solution

75. Write a C# Sharp program to display alphabet pattern like R with an asterisk. Go to the editor

```Display the pattern like 'R' with an asterisk:
---------------------------------------------

****
*   *
*   *
****
* *
*  *
*   *
```

Click me to see the solution

76. Write a C# Sharp program to display alphabet pattern like S with an asterisk. Go to the editor

```Display the pattern like 'S' with an asterisk:
---------------------------------------------

****
*
*
***
*
*
****
```

Click me to see the solution

77. Write a C# Sharp program to display alphabet pattern like T with an asterisk. Go to the editor

```Display the pattern like 'T' with an asterisk:
---------------------------------------------

*****
*
*
*
*
*
*
```

Click me to see the solution

78. Write a C# Sharp program to display alphabet pattern like U with an asterisk. Go to the editor

```Display the pattern like 'U' with an asterisk:
---------------------------------------------

*   *
*   *
*   *
*   *

*   *
*   *
***
```

Click me to see the solution

79. Write a C# Sharp program to display alphabet pattern like V with an asterisk. Go to the editor

```Display the pattern like 'V' with an asterisk:
---------------------------------------------

*   *
*   *
*   *
*   *
*   *
* *
*
```

Click me to see the solution

80. Write a C# Sharp program to display alphabet pattern like W with an asterisk. Go to the editor

```Display the pattern like 'W' with an asterisk:
---------------------------------------------

*   *
*   *
*   *
*   *
* * *
* * *
* *
```

Click me to see the solution

81. Write a C# Sharp program to display alphabet pattern like X with an asterisk. Go to the editor

```Display the pattern like 'X' with an asterisk:
---------------------------------------------

*   *
*   *
* *
*
* *
*   *
*   *
```

Click me to see the solution

82. Write a C# Sharp program to display alphabet pattern like Y with an asterisk. Go to the editor

```Display the pattern like 'Y' with an asterisk:
---------------------------------------------

*   *
*   *
* *
*
*
*
*
```

Click me to see the solution

83. Write a C# Sharp program to display alphabet pattern like Z with an asterisk. Go to the editor

```Display the pattern like 'Z' with an asterisk:
---------------------------------------------

*******
*
*
*
*
*
*******
```

Click me to see the solution

## C# Sharp 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.

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