Java毕达哥拉斯定理

Question

import java.util.Scanner; 

public class PythagoreanTheorem {

        public static void main(String[] args) {


        // Get User Input
         Scanner keyboard = new Scanner(System.in);
        double sideA, sideB, hypothenuse;


        System.out.println("Please enter the value of sideA");
        sideA = keyboard.nextDouble();
        System.out.println("Please enter the value of SideB");
        sideB = keyboard.nextDouble();

        // Find the value of the hypothenuse
        hypothenuse = Math.sqrt((sideA*sideA)+(sideB*sideB));

        double roundOff = Math.round( hypothenuse * 100) / 100;

        System.out.println("The length of the hypothenuse is "  +   roundOff );         
    }

}

此代码构建但不显示常规输出。 我试图从斜边只显示2位小数。

Answer 1

尝试使用以下内容：

 double roundOff = Math.round(hypothenuse * 100.0) / 100.0;

运行我的代码：

 Please enter the value of sideA
 232
 Please enter the value of SideB
 454
 The length of the hypothenuse is 509.84

Answer 2

您可以使用String.format（）格式化十进制数

System.out.println("The length of the hypothenuse is "  +   String.format("%.2f", roundOff));