点击链接PAT乙级-AC全解汇总

点击链接PAT甲级-AC全解汇总

题目：
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:
1

Each input file contains one test case. Each case contains a pair of integers a and b where −10^​6​​ ≤a,b≤10^​6​​ . 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
1

Sample Output:

-999,991
1

题意：
求两个数字的和，然后每三位插一个逗号

我的代码：

#include
using namespace std;

int main()
{
    int a,b;
    cin>>a>>b;
    string str=to_string(a+b);
    reverse(str.begin(),str.end());
    int index=0,flag=1;
    while(index<str.length())
    {
        if(flag%4==0&&str[index]!='-')
        {
            str.insert(index,",");
            index++;
            flag=1;
        }
        index++;
        flag++;
    }
    reverse(str.begin(),str.end());
    cout<<str<<endl;
    return 0;
}

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