题目链接:https://pintia.cn/problem-sets/994805342720868352/problems/994805528788582400

Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).

Input Specification:

Each input file contains one test case. Each case contains a pair of integers a and b where −. The numbers are separated by a space.

Output Specification:

For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.

Sample Input:

-1000000 9

Sample Output:

-999,991
 #include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
#include <algorithm>
#include <stack>
using namespace std;
int main()
{
int n,m,sum;
while(cin>>n>>m){
sum=n+m;
if(sum==){
cout<<<<endl;
continue;
}
int flag=;
if(sum<){
flag=;
sum=-sum;
}
char c='-';
stack<char> s;
int t=;
while(sum){
c=sum%+'';
s.push(c);
t++;
if(t%==&&sum/) s.push(',');
sum/=;
}
if(flag) s.push('-');
while(!s.empty()){
cout<<s.top();
s.pop();
}
cout<<endl;
}
return ;
}
 

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