题解 | #数位之和#

#include <stdio.h>

int main() {
    int n, result = 0;
    while (scanf("%d", &n) != EOF) {
        while (n > 0) {
            result += (n % 10);
            n /= 10;
        }
    }
    printf("%d\n", result);
    return 0;
}