PTA | 1001 A+B Format (C++)

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本文介绍了一种算法，用于计算两个整数的和，并将结果显示为标准格式，即每三位数字用逗号分隔。该算法适用于处理范围在-10^6到10^6之间的整数，通过使用C++的stringstream进行字符串操作实现。

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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 −106≤a,b≤106. 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 <sstream>

using namespace std;

int main()
{
    int a, b;
    cin >> a >> b;
    
    stringstream sStream;
    sStream << a + b;
    string s(sStream.str());

    int cnt = 0;
    for (string::iterator it = s.end() - 1; it != s.begin(); --it)
    {
        (++cnt) %= 3;
        if (cnt == 0 && !((it - s.begin() == 1) && s.front() == '-'))
        {
            s.insert(it, ',');
        }
    }
            
    cout << s << endl;

    return 0;
}