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

#include <stdio.h>

​

// This function will make sum of digits of number itself

void DigitSum(int x) {

    int sum = 0, m;

​

    printf ("The sum of %d digits is = ", x);

    while (x > 0) {

        m = x%10;    

        sum = sum+m;    

        x = x/10;    

    }

    printf ("%d\n", sum);

}

​

// It's the driver function

int main() {

    int x;

    printf ("Enter the integer number::\n");

    scanf ("%d", &x);

    DigitSum(x);

    return 0;

}