C# Sharp Recursion : Exercises, Practice, Solution

C# Sharp Recursion [15 exercises with solution]

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1. Write a program in C# Sharp to print the first n natural numbers using recursion.
Test Data :
How many numbers to print : 10
Expected Output :
1 2 3 4 5 6 7 8 9 10
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2. Write a program in C# Sharp to print numbers from n to 1 using recursion.
Test Data :
How many numbers to print : 10
Expected Output :
10 9 8 7 6 5 4 3 2 1
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3. Write a program in C# Sharp to find the sum of the first n natural numbers using recursion.
Test Data :
How many numbers to sum : 10
Expected Output :
The sum of first 10 natural numbers is : 55
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4. Write a program in C# Sharp to display the individual digits of a given number using recursion.
Test Data :
Input any number : 1234
Expected Output :
The digits in the number 1234 are : 1 2 3 4
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5. Write a program in C# Sharp to count the number of digits in a number using recursion.
Test Data :
Input any number : 12345
Expected Output :
The number 12345 contains number of digits : 5
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6. Write a program in C to print even or odd numbers in a given range using recursion.
Test Data :
Input the range to print starting from 1 : 20
Expected Output :
All even numbers from 1 to 20 are :
2 4 6 8 10 12 14 16 18 20

All odd numbers from 1 to 20 are :
1 3 5 7 9 11 13 15 17 19
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7. Write a program in C# Sharp to check whether a number is prime or not using recursion.
Test Data :
Input any positive number : 37
Expected Output :
The number 37 is a prime number.
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8. Write a program in C# Sharp to check whether a given string is a palindrome or not using recursion.
Test Data :
Input a string : RADAR
Expected Output :
The string is Palindrome.
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9. Write a program in C# Sharp to find the factorial of a given number using recursion.
Test Data :
Input any positive number : 5
Expected Output :
The factorial of 5 is : 120
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10. Write a program in C# Sharp to find the Fibonacci numbers for a series of n numbers using recursion.
Test Data :
Input number of terms for the Fibonacci series : 10
Expected Output :
The Fibonacci series of 10 terms is : 0 1 1 2 3 5 8 13 21 34
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11. Write a program in C# Sharp to generate all possible permutations of an array using recursion.
Test Data :
Input the number of elements to store in the array [maximum 5 digits ] :3
Input 3 number of elements in the array :
element - 0 : 1
element - 1 : 2
element - 2 : 3
Expected Output :
The Permutations with a combination of 3 digits are :
123 132 213 231 321 312
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12. Write a program in C# Sharp to find the LCM and GCD of two numbers using recursion.
Test Data :
Input the first number : 10
Input the second number : 15
Expected Output :
The GCD of 10 and 15 = 5
The LCM of 10 and 15 = 30
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13. Write a program in C# Sharp to convert a decimal number to binary using recursion.
Test Data :
Input a decimal number : 66
Expected Output :
The binary equivalent of 66 is : 1000010
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14. Write a program in C# Sharp to get the reverse of a string using recursion.
Test Data :
Input the string : w3resource
Expected Output :
The reverse of the string is : ecruoser3w
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15. Write a program in C# Sharp to calculate the power of any number using recursion.
Test Data :
Input the base value : 5
Input the exponent : 3
Expected Output :
The value of 5 to the power of 3 is : 125
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C# Sharp Code Editor:

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