Question

How to add all digits of a number in C

Answer 1

#include <stdio.h>

int sum_digits(int n) {
    int sum = 0;
    while (n > 0) {
        int d = n % 10;
        n /= 10;
        sum += d;
    }
	return sum;
}

int main() {
    int n = 12345;
	
    printf("sum number: %d digits = %d\n", n, sum_digits(n));
	
    return 0;
}	

   
   
   
/*
run:
   
sum number: 12345 digits = 15
   
*/

 

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