题解 | 数位之和

#include <iostream>
#include<cmath>
using namespace std;

int main() {
    int n;
    int f=0;
    int i=1;
    cin>>n;
    int abs1=abs(n);
    while(abs1>0){
        f=f+abs1%10;
        abs1=abs1/10;
    }
    cout <<f<<endl;
}
// 64 位输出请用 printf("%lld")