题解 | 数位之和

#include <stdio.h>

int main() {
    long long n;
    scanf("%lld",&n);
    if(n<0) n=-n;
    int result = 0;
    while(n)
    {
        result += n%10;
        n /= 10;
    }
    printf("%d",result);
    return 0;
}