第六章第三十五题(几何:五边形的面积)(Geometry: area of a pentagon) – 编程练习题答案

6.35(几何:五边形的面积)五边形的面积可以使用下面的公式计算:

编写一个方法,使用下面的方法头来返回五边形的面积。

public static double area(double side)

编写一个主方法,提示用户输入五边形的边,然后显示它的面积。

下面是一个运行示例:

Enter the side:5.5

The area of the pentagon is 52.044441
 

6.35(Geometry: area of a pentagon)The area of a pentagon can be computed using the following formula:

Write a method that returns the area of a pentagon using the following header:

public static double area(double side)

Write a main method that prompts the user to enter the side of a pentagon and displays its area.

Here is a sample run:

Enter the side:5.5

The area of the pentagon is 52.044441
 

下面是参考答案代码:

// https://cn.fankuiba.com
import java.util.Scanner;

public class Ans6_35_page205 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the side: ");
        double side = input.nextDouble();
        System.out.println("The area of the pentagon is "+area(side));
    }
    public static double area(double side) {
        return  (5 * side * side) / (4 * Math.tan(Math.PI / 5));
    }
}

适用Java语言程序设计与数据结构(基础篇)(原书第11版)Java语言程序设计(基础篇)(原书第10/11版)更多内容

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