题解 | 求四位数各个数位之和

#include <bits/stdc++.h>
using namespace std;

int main() 
{
    int n,ge,shi,bai,qian,sum;
    cin>>n;
    ge=n%10;
    n/=10;
    shi=n%10;
    n/=10;
    bai=n%10;
    n/=10;
    qian=n%10;
    sum=ge+shi+bai+qian;
    cout<<sum;
    return 0;
}