1001. A+B Format (20)

1.主要是字符串处理，然后插入逗号

2.注意正负数

3.输入可以直接使用int类型读取

AC代码

//#include<string>
//#include<stack>
//#include<unordered_set>
//#include <sstream>
//#include "func.h"
//#include <list>
#include <iomanip>
#include<unordered_map>
#include<set>
#include<queue>
#include<map>
#include<vector>
#include <algorithm>
#include<stdio.h>
#include<iostream>
#include<string>
#include<memory.h>
#include<limits.h>
#include<stack>
using namespace std;

int main(void)
{
	int a, b;
	cin >> a >> b;
	int result = a + b;
	bool sign = true;//正负符号标志位
	if (result < 0)
	{
		result = -result;
		sign = false;
	}
	string str = "";
	if (result == 0) str = "0";
	while (result != 0)
	{//转化成string
		char c = result % 10 + '0';
		str += c;
		result /= 10;
	}

	//此时的str是倒序的
	string output = "";
	for (int i = 0; i < str.size() - 1; i++)
	{
		output = str[i] + output;
		if ((i+1) % 3 == 0)
			output = ',' + output;
	}
	output = str[str.size() - 1] + output;
	if (!sign) output = "-" + output;
	cout << output << endl;

	return 0;
}