【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<){
         cout<<"-";
         ans=-ans;
     }
     int x=ans%;
     int y=ans/;
     int z=y%;
     int yy=y/;
     if(yy){
         cout<<yy<<",";
         if(z/)
             cout<<z<<",";
         else if(z/)
             cout<<""<<z<<",";
         else if(z)
             cout<<""<<z<<",";
         else
             cout<<"000,";
         if(x/)
             cout<<x;
         else if(x/)
             cout<<""<<x;
         else if(x)
             cout<<""<<x;
         else
             cout<<"";
     }
     else if(z){
         cout<<z<<",";
         if(x/)
             cout<<x;
         else if(x/)
             cout<<""<<x;
         else if(x)
             cout<<""<<x;
         else
             cout<<"";
     }
     else
         cout<<x;
     return ;
 }