C Programming Exercises, Practice, Solution : Recursion
This resource offers a total of 105 C Recursion problems for practice. It includes 21 main exercises, each accompanied by solutions, detailed explanations, and four related problems.
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1. Print Natural Numbers Recursively Variants
Write a program in C to print the first 50 natural numbers using recursion.
Expected Output:
The natural numbers are : 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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
2. Sum of Numbers Recursively Variants
Write a program in C to calculate the sum of numbers from 1 to n using recursion.
Test Data :
Input the last number of the range starting from 1 : 5
Expected Output:
The sum of numbers from 1 to 5 : 15
3. Fibonacci Series Recursion Variants
Write a program in C to print the Fibonacci Series using recursion.
Test Data :
Input number of terms for the Series (< 20) : 10
Expected Output:
Input number of terms for the Series (< 20) : 10 The Series are : 1 1 2 3 5 8 13 21 34 55
4. Array Elements Print Recursion Variants
Write a program in C to print the array elements using recursion.
Test Data :
Input the number of elements to be stored in the array :6
Input 6 elements in the array :
element - 0 : 2
element - 1 : 4
element - 2 : 6
element - 3 : 8
element - 4 : 10
element - 5 : 12
Expected Output :
The elements in the array are : 2 4 6 8 10 12
5. Count Digits Recursion Variants
Write a program in C to count the digits of a given number using recursion.
Test Data :
Input a number : 50
Expected Output :
The number of digits in the number is : 2
6. Sum of Digits Recursion Variants
Write a program in C to find the sum of digits of a number using recursion.
Test Data :
Input any number to find sum of digits: 25
Expected Output:
The Sum of digits of 25 = 7
7. GCD Recursion Variants
Write a program in C to find the GCD of two numbers using recursion.
Test Data :
Input 1st number: 10
Input 2nd number: 50
Expected Output :
The GCD of 10 and 50 is: 10
8. Largest Element in Array Recursion Variants
Write a program in C to get the largest element of an array using recursion.
Test Data :
Input the number of elements to be stored in the array :5
Input 5 elements in the array :
element - 0 : 5
element - 1 : 10
element - 2 : 15
element - 3 : 20
element - 4 : 25
Expected Output :
Largest element of an array is: 25
9. Reverse String Recursion Variants
Write a program in C to reverse a string using recursion.
Test Data :
Input any string: w3resource
Expected Output:
The reversed string is: ecruoser3w
10. Factorial Recursion Variants
Write a program in C to find the Factorial of a number using recursion.
Test Data :
Input a number : 5
Expected Output:
The Factorial of 5 is : 120
11. Decimal to Binary Recursion Variants
Write a program in C to convert a decimal number to binary using recursion.
Test Data :
Input any decimal number : 66
Expected Output :
The Binary value of decimal no. 66 is : 1000010
12. Prime Check Recursion Variants
Write a program in C to check if a number is a prime number or not using recursion.
Test Data :
Input any positive number : 7
Expected Output :
The number 7 is a prime number.
13. LCM Recursion Variants
Write a program in C to find the LCM of two numbers using recursion.
Test Data :
Input 1st number for LCM : 4
Input 2nd number for LCM : 6
Expected Output :
The LCM of 4 and 6 : 12
14. Even/Odd Range Recursion Variants
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 : 10
Expected Output :
All even numbers from 1 to 10 are : 2 4 6 8 10 All odd numbers from 1 to 10 are : 1 3 5 7 9
15. Matrix Multiplication Recursion Variants
Write a C program to multiply two matrices using recursion.
Test Data :
Input number of rows for the first matrix : 2
Input number of columns for the first matrix : 1
Input number of rows for the second matrix : 1
Input number of columns for the second matrix : 2
Input elements in the first matrix :
element - [0],[0] : 1
element - [1],[0] : 2
Input elements in the second matrix :
element - [0],[0] : 3
element - [0],[1] : 4
Expected Output :
Here is the elements of First matrix :
1
2
Here is the elements of Second matrix :
3 4
The multiplication of two matrix is :
3 4
6 8
16. Palindrome String Recursion Variants
Write a C program to check whether a given string is a palindrome or not using recursion.
Test Data :
Input a word to check for palindrome : mom
Expected Output :
The entered word is a palindrome.
17. Power Calculation Recursion Variants
Write a program in C to calculate the power of any number using recursion.
Test Data :
Input the base value : 2
Input the value of power : 6
Expected Output :
The value of 2 to the power of 6 is : 64
18. Hailstone Sequence Recursion Variants
Write a C program to find the Hailstone Sequence of a given number up to 1.
Test Data :
Input any number (positive) to start for Hailstone Sequence : 13
Expected Output :
The hailstone sequence starting at 13 is : 13 40 20 10 5 16 8 4 2 1 The length of the sequence is 10.
19. String Copy Recursion Variants
Write a program in C to copy one string to another using recursion.
Test Data :
Input the string to copy : w3resource
Expected Output :
The string successfully copied.
The first string is : w3resource
The copied string is : w3resource
20. Find First Capital Letter Recursion Variants
Write a program in C to find the first capital letter in a string using recursion.
Test Data :
Input a string to including one or more capital letters : testString
Expected Output :
The first capital letter appears in the string testString is S.
21. Binary Search Recursion Variants
Write a program in C for binary search using recursion.
Test Data :
Input the number of elements to store in the array :3
Input 3 numbers of elements in the array in ascending order :
element - 0 : 15
element - 1 : 25
element - 2 : 35
Input the number to search : 35
Expected Output :
The search number found in the array.
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