PAT1001 A+B Format (20分)

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于 2020-03-20 12:11:55 发布

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该博客介绍了一个计算两数之和的问题，要求将结果按照每三位一组，用逗号分隔的标准格式输出。输入包含两个在-10^6和10^6之间的整数，输出为它们的和，格式化后的形式。

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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

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner (System.in);
		BigInteger a = sc.nextBigInteger();
		BigInteger b = sc.nextBigInteger();
		String c = a.add(b).toString();
		int count = 0;
		for(int i = 0 ; i < c.length(); i++) {
			count++;
			System.out.print(c.charAt(i));
			if(c.charAt(i) == '-') continue;
			if(count % 3 == c.length() % 3 && i != c.length()-1) {
				System.out.print(",");
			}
		}
	}
}