C Exercises: Find the sum of digits of a number

C Recursion: Exercise-6 with Solution

Write a program in C to find the sum of digits of a number using recursion.

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>
 
int DigitSum(int num);
 
int main()
{
    int n1, sum;
	printf("\n\n Recursion : Find the sum of digits of a number :\n");
	printf("-----------------------------------------------------\n");     
    printf(" Input any number to find sum of digits: ");
    scanf("%d", &n1);
     
    sum = DigitSum(n1);//call the function for calculation
     
    printf(" The Sum of digits of %d = %d\n\n", n1, sum);
     
    return 0;
}

int DigitSum(int n1)
{
    if(n1 == 0)
        return 0;
         
    return ((n1 % 10) + DigitSum(n1 / 10));//calling the function DigitSum itself
}

Sample Output:

 Recursion : Find the sum of digits of a number :                                                             
-----------------------------------------------------                                                         
 Input any number to find sum of digits: 25                                                                   
 The Sum of digits of 25 = 7

Flowchart:

C Programming Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a program in C to count the digits of a given number using recursion.
Next: Write a program in C to find GCD of two numbers using recursion.