Question

How to sum the digits of a number using recursion in C

Answer 1

#include <stdio.h>

int sum_recursion(int n) {
    if (n != 0) {
        return (n % 10 + sum_recursion(n / 10));
    }
    else {
       return 0;
    }
}

int main(void) {
    int n = 3891;
 
    printf("%d\n", sum_recursion(n));

    return 0;
}




/*
run:

21

*/

 

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