题解 | 数位之和

#include <stdio.h>

int main() {
    int num;
    scanf("%d",&num);
    int sum=0;
    while(num>0)
    {
        sum+=(num%10);
        num=num/10;
    }
    if(sum>=0)
    printf("%d",sum);
    else
     printf("%d",-sum);
    return 0;
}