PAT 1001.A+B Format

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本文提供了一道PAT竞赛题目A+B Format的解决方案。该题目要求实现两个整数相加，并将结果按标准格式输出，即每三位数字插入一个逗号进行分隔。示例输入为-1000000和9，输出为-999,991。程序使用Java编写，通过字符串操作完成数字格式化。

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原题地址： http://www.patest.cn/contests/pat-a-practise/1001
1001. A+B Format (20)

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

Each input file contains one test case. Each case contains a pair of integers a and b where -1000000 <= a, b <= 1000000. The numbers are separated by a space.

Output

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

本题

package com.dye.pat.t1001;

import java.util.Scanner;

public class Main {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String[] input = in.nextLine().split(" ");
        in.close();

        int a = Integer.parseInt(input[0].trim());
        int b = Integer.parseInt(input[1].trim());

        String result = "" + (a + b);
        String flag = "";


        if (result.charAt(0) == '-') {
            flag = "-";
            result = result.substring(1);
        }

        int count = result.length();
        count = (3 - count % 3) % 3;

        for (int i = 0; i < result.length(); i++) {

            if (count !=0 &&count % 3 == 0)
                flag = flag + ",";
            flag += result.substring(i, i+1);
            count++;
        }
        System.out.println(flag);
    }
}