Java 程序：查找菱形的面积

编写一个 Java 程序来查找菱形的面积。此示例允许用户输入菱形的对角线，并使用数学公式 (d1 * d2)/2 计算面积。 

import java.util.Scanner;

public class Example {
	private static Scanner sc;

	public static void main(String[] args) {
		double rhomDg1, rhomDg2, rhomAr;
		sc = new Scanner(System.in);
		
		System.out.println("Enter First & Second Diagonal = ");
		rhomDg1 = sc.nextDouble();
		rhomDg2 = sc.nextDouble();

		rhomAr = (rhomDg1 * rhomDg2)/2; 

		System.out.format("The Area = %.2f", rhomAr);
	}
}

Enter First & Second Diagonal = 
22
28
The Area = 308.00

在此程序中，我们声明了一个返回菱形面积的 calRhombusArea 函数。

import java.util.Scanner;

public class AreaOfRhombus2 {
	private static Scanner sc;

	public static void main(String[] args) {
		float rhomDg1, rhomDg2, rhomArea;
		sc = new Scanner(System.in);	
		
		System.out.println("Enter Rhombus First & Second Diagonal = ");
		rhomDg1 = sc.nextFloat();
		rhomDg2 = sc.nextFloat();

		rhomArea = calRhombusArea(rhomDg1, rhomDg2);
		
		System.out.format("The Area of a Rhombus = %.2f", rhomArea);
	}
	public static float calRhombusArea(float rhomDg1, float rhomDg2)
	{
		return (rhomDg1 * rhomDg2)/2; 
	}
}

Java 程序：查找菱形的周长

编写一个程序来查找菱形的周长。此示例允许用户输入菱形的边长，其面积是边长的四倍。

import java.util.Scanner;

public class PerimeterOfRhombus1 {
	private static Scanner sc;

	public static void main(String[] args) {
		double rhomside, rhomPerim;
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rhombus Side = ");
		rhomside = sc.nextDouble();

		rhomPerim =  4 * rhomside; 
		System.out.format("The Perimeter of a Rhombus = %.2f\n", rhomPerim);
	}
}

在此程序中，我们创建了一个返回菱形周长的函数。

import java.util.Scanner;

public class PerimeterOfRhombus2 {
	private static Scanner sc;

	public static void main(String[] args) {
		float rhomside, rhomPerim;
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Side = ");
		rhomside = sc.nextFloat();

		rhomPerim =  rhombusPerimeter(rhomside); 

		System.out.format("The Perimeter = %.2f", rhomPerim);
	}
	
	public static float rhombusPerimeter(float rhomside) {
		return 4 * rhomside; 
	}
}

Please Enter Side = 13
The Perimeter = 52.00