题解 | 数位之和

#include <iostream>
using namespace std;
int main()
{
    int n,sum=0;
    cin>>n;
    if(n<0){
        n=-n;
    }
    while(n!=0){
        sum+=n%10;
        n=n/10;
    }
    cout<<sum<<endl;
    return 0;
}