ACM_1048_四舍五入到小数点后两位

最新推荐文章于 2021-02-12 19:14:40 发布

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本文介绍了一个简单的Java程序，用于帮助用户计算过去十二个月银行账户的平均余额。通过读取每个月的账户余额并进行计算，该程序能有效地帮助用户了解其财务状况。

题目：

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=48

Larry graduated this year and finally has a job. He's making a lot of money, but somehow never seems to have enough. Larry has decided that he needs to grab hold of his financial portfolio and solve his financing problems. The first step is to figure out what's been going on with his money. Larry has his bank account statements and wants to see how much money he has. Help Larry by writing a program to take his closing balance from each of the past twelve months and calculate his average account balance.

Input Format:

The input will be twelve lines. Each line will contain the closing balance of his bank account for a particular month. Each number will be positive and displayed to the penny. No dollar sign will be included.

Output Format:

The output will be a single number, the average (mean) of the closing balances for the twelve months. It will be rounded to the nearest penny, preceded immediately by a dollar sign, and followed by the end-of-line. There will be no other spaces or characters in the output.

Sample Input:

100.00
489.12
12454.12
1234.10
823.05
109.20
5.27
1542.25
839.18
83.99
1295.01
1.75

Sample Output:

$1581.42

Mine Code：

import java.text.DecimalFormat;
import java.util.Scanner;


public class ACM_1048 {
	
	public static void main(String[] args){
		
		//read from console
		Scanner in = new Scanner(System.in);
		double sum=0;
		
	
		
		/*
		 * int i = 1;
		 * 
		 * while(in.hasNextDouble() && i<=12){
			double a = in.nextDouble();
			sum = sum+a;
			i=i+1;
			
		}*/
		
		for(int i = 0; i<12;i++)
		{
			sum = sum + in.nextDouble();
		}
		
		sum = sum/12;
		
		//round to .XX
		DecimalFormat df = new DecimalFormat("##.00");
		sum = Double.parseDouble(df.format(sum));
		
		System.out.println("$"+sum);
	}

}

Summary:

1.四舍五入

//round to .XX
DecimalFormat df = new DecimalFormat("##.00");
sum = Double.parseDouble(df.format(sum));