Question

Write a C program program to calculate the sum of digits of a number: Use modulus
operator (%) to extract individual digits of a number and keep on adding them.

Answer 1

#include <stdio.h>

int main() {
    int n;
    printf("Enter a positive integer: ");
    scanf("%d", &n);
    int sum = 0;
    while(n > 0) {
        sum += n%10;
        n /= 10;
    }
    printf("Sum of all digits = %d\n", sum);
    return 0;
}