在 Java 中添加小数位(3 个小数位) [英] Adding Decimal Places (3 Decimal Places) in Java

问题描述

我想知道如何使以下程序中的 avg 四舍五入到小数点后三位:

I was wondering how to make avg in the following program round to 3 decimal places:

public class BaseballCalculator {
    public static void main(String args[])  {
        Scanner myScanner = new Scanner(System.in);
        double atBats;
        double baseHits;
        double onBase;
        double avg;
        double onBasePercentage;

        System.out.println("How many atbats did you have? ");
            atBats = myScanner.nextDouble();

        System.out.println("How many base hits and homeruns did you have? ");
            baseHits = myScanner.nextDouble();

        System.out.println("How many times did you get a hit by pitch or walk? ");
            onBase = myScanner.nextDouble();

        avg = baseHits / atBats;
        onBasePercentage = (baseHits + onBase) / atBats;

        System.out.println("You have a total of " + baseHits + " base hits for the season");
        System.out.println("You have a total of " + atBats + " at bats for the season");
        System.out.println("Your average for the game or season is: " + avg);
        System.out.println("Your on base percentage for the game or year is: " + onBasePercentage);
    }
}

推荐答案

使用 String.format 将您的输出格式化为 3 个小数位.输出四舍五入.

Use String.format to format your output to 3 decimal places. The output is rounded.

System.out.println("Your average for the game or season is: " +
    String.format("%.3f", avg));

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