PAT甲级 —— 1001 A+B Format (20分)

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题目链接：A+B Format (20分)
题目描述

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 $PAT甲级 —— 1001 A+B Format (20分)_ios$ . 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

满分代码

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;

int main()
{
  int a,b,sum;
  string s;
  cin>>a>>b;
  sum = a+b;
  
  s = to_string(sum);
  int len = s.length();
  for(int i=0;i<len;i++)
  {
    cout<<s[i];
    
    if (s[i] == '-') 
      continue;
    if ((i + 1) % 3 == len % 3 && i != len - 1) 
      cout << ",";
  }

  return 0;
}