java - 如何让我的 Java 程序四舍五入？

Question

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How to round a number to n decimal places in Java (39 个回答)

已关闭 7 年前。

我希望我的 Java 程序将数字四舍五入到小数点后两位。我一直在查看我的类 Material ，但找不到解决方案。这是代码

import java.io.*;

import java.util.*;

public class prog58i

{
public static void main (String[] args)

{
//input
System.out.print("the amount I wish to borrow is? ");
Scanner a = new Scanner(System.in);
double borrow = a.nextDouble();
//Shows amount of money someone wants to borrow

System.out.print("The loan rate I can get is? ");
Scanner b = new Scanner(System.in);
double rate = b.nextDouble();
//Shows loan interest rate

System.out.print("The number of months it will take me to pay of this loan is? ");
Scanner c = new Scanner(System.in);
double months = c.nextDouble();
//Shows months loan will be taken out


//The Math Part
double MP = borrow * (rate/1200) * (Math.pow((1+rate/1200), months)) /     (Math.pow((1+rate/1200), months)- 1);
double intrest = (MP * months) - borrow;
double repaid = (MP*months);

//Output
System.out.print( "My monthly payments will be $" +MP +"\n");
System.out.print( "Total Interest Paid is $" +intrest +"\n");
System.out.print( "Total Amount Paid is $" +repaid +"\n");
}
}

我更多的是寻找教程或只是一些关于如何自己做的建议。

Answer 1

如果你只需要四舍五入输出，你可以这样做

System.out.printf("My monthly payments will be $%.2f%n", MP);
System.out.printf("Total Interest Paid is $%.2f%n", intrest);
System.out.printf("Total Amount Paid is $%.2f%n", repaid);