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

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

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**1.** Write a program in C# Sharp to display the first 10 natural numbers.

*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 the first 10 natural numbers.

*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 C# Sharp program that displays the sum of n natural numbers.

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 C# Sharp program to read 10 numbers and find their average and sum.

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 C# Sharp program to display the cube of an integer up to given number.

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.

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.

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 C# Sharp program to display the n terms of odd natural numbers and their sums.

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 a right angle triangle with an asterisk.

The pattern like :

* ** *** ****

**10.** Write a program in C# Sharp to display a pattern like a right angle triangle with a number.

The pattern like :

1 12 123 1234

**11.** Write a program in C# Sharp to make such a pattern like a right angle triangle with a number which repeats a number in a row.

The pattern like :

1 22 333 4444

**12.** Write a C# Sharp program to make such a pattern like a right angle triangle with the number increased by 1.

The pattern like :

1 2 3 4 5 6 7 8 9 10

**13.** Write a program in C# Sharp to make such a pattern like a pyramid with numbers increasing by 1.

1 2 3 4 5 6 7 8 9 10

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

* * * * * * * * * *

**15.** Write a C# Sharp program to calculate the factorial of a given number.

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.

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.

1 2 2 3 3 3 4 4 4 4

**18.** Write a program in C# Sharp to find the sum of the series [ 1-X^2/2!+X^4/4!- .........].

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.

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.

* *** *****

**21.** Write a program in C# Sharp to display the sum of the series [ 9 + 99 + 999 + 9999 ...].

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 Floyd's Triangle.

1 01 101 0101 10101

**23.** Write a program in C# Sharp to display the sum of the series [ 1+x+x^2/2!+x^3/3!+....].

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 -.....].

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 C# Sharp program that displays the n terms of square natural numbers and their sum.

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.

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 for checking if a number is a perfect number.

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 number range.

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.

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 numbers.

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.

* *** ***** ******* ********* ******* ***** *** *

**32.** Write a C# Sharp program to determine whether a given number is prime or not.

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 Pascal's triangle.

Test Data :

Input number of rows: 5

*Expected Output* :

**34.** Write a program in C# Sharp to find prime numbers within a range of numbers.

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.

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 such a pattern for n number of rows using a number starting with the number 1. The first and last number of each row will be 1.

1 121 12321

**37.** Write a program in C# Sharp to display a number in reverse order.

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.

Test Data :

Input a number: 121

*Expected Output* :

121 is a palindrome number.

Click me to see the solution

**39.** Write a C# Sharp program to find the number and sum of all integers between 100 and 200 divisible by 9.

*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.

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.

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.

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 the HCF (Highest Common Factor) of two numbers.

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 the LCM of any two numbers using HCF.

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 the LCM of any two numbers.

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 C# Sharp program to convert a binary number into a decimal number using the math function.

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.

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.

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 the Arithmetic Progress series.

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.

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 an array.

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 C# Sharp program to find the sum of the Geometric Progress series.

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.

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.

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. .

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 expressed as the sum of two prime numbers.

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.

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 an alphabet pattern like A with an asterisk.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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