题解 | 求四位数各个位数之和

#include <stdio.h>

int main() {
    int i, num;
    int n = 0;
    scanf("%d", &num);

    while (num > 0) {
        i = num % 10;
        num = num / 10;
        n = n + i;
    }
    printf("%d", n);
    return 0;
}