【PAT甲级】1001 A+B Format (20 分)

题意：给两个整数a，b，计算a+b的值并每三位用逗号隔开输出（−1e6​​≤a,b≤1e6​​）

AAAAAccepted code：

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    cin>>a>>b;
    int ans=a+b;
    if(ans<0){
        cout<<"-";
        ans=-ans;
    }
    int x=ans%1000;
    int y=ans/1000;
    int z=y%1000;
    int yy=y/1000;
    if(yy){
        cout<<yy<<",";
        if(z/100)
            cout<<z<<",";
        else if(z/10)
            cout<<"0"<<z<<",";
        else if(z)
            cout<<"00"<<z<<",";
        else
            cout<<"000,";
        if(x/100)
            cout<<x;
        else if(x/10)
            cout<<"0"<<x;
        else if(x)
            cout<<"00"<<x;
        else
            cout<<"000";
    }
    else if(z){
        cout<<z<<",";
        if(x/100)
            cout<<x;
        else if(x/10)
            cout<<"0"<<x;
        else if(x)
            cout<<"00"<<x;
        else
            cout<<"000";
    }
    else
        cout<<x;
    return 0;
}