Example: Sum of Digits of a Number in C using Recursion

C
C++
C#
Java
Python
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// Sum of Digits of a Number in C using Recursion
#include <stdio.h>

// This function will make sum of digits of number itself
// Using the recursion
int DigitSum(int x) {
    if (x == 0)
        return 0;
    return (x % 10 + DigitSum(x / 10));
}

// It's the driver function
int main() {
    int x;
    
    printf ("Enter the integer number::\n");
    scanf ("%d", &x);
    
    printf ("The sum of %d digits is = ", x);
    printf("%d\n", DigitSum(x));
    return 0;
}