PAT甲级——A+B Format

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博客围绕PAT甲级的A+B Format题目展开，介绍输入输出规范。输入为一对范围在 -106 到 106 的整数，输出是两数之和按标准格式（每三位用逗号分隔）。思路是将两数相加结果存字符串，从后往前每三位插逗号，要注意正负区别。

PAT甲级——A+B Format

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

思路分析

将输入的两个数字相加，并赋值给字符串数组，然后从后往前扫描，每三位插入一个逗号。注意正负区别，负数前面要多一位。

参考代码

#include<iostream>
#include<string>
#include<sstream>
#include<math.h>
 
using namespace std;

int main(){
	//输入数据
	int a,b,sum;
	cin>>a>>b;
	sum=a+b;
	
	//判断正负 	
	bool isNeg_sum=false;
	if(sum<0){
		isNeg_sum=true;
		sum=abs(sum);
	}
	
	//插入字符
	string strSum;
	stringstream s;
	s<<sum;
	s>>strSum;
	int i;
	for(i=strSum.length()-3;i>0;i-=3){
		strSum.insert(i,",");
	}
	
	// 输出
	if(isNeg_sum){
		strSum.insert(0,"-");
	}
	cout<<strSum;
	return 0;
}