第2周：计算圆的面积

Java圆面积计算与控制台输入

最新推荐文章于 2025-07-29 11:30:27 发布

VinaLin

最新推荐文章于 2025-07-29 11:30:27 发布

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本文介绍了一个简单的Java程序，用于计算指定半径的圆的面积，并演示了如何使用Scanner类从控制台读取浮点数作为半径。

<span style="font-family:Comic Sans MS;">public class ComputeArea {
	public static void main(String []args){
		final double PI=3.14159;
		double area;
		area=PI*10*10;
		System.out.println("The area for the circle of 10 is "+area);
		
	}</span>

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}<img src="https://img-blog.youkuaiyun.com/20140412112401781?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxNDAyNjkyNg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
</span>

<span style="font-family:Comic Sans MS;">
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<span style="font-family:Comic Sans MS;">从控制台读取输入</span>

<span style="font-family:Comic Sans MS;">如何通过调用nextDouble()方法来读取带小数点的数。</span>

<span style="font-family:Comic Sans MS;"></span><pre name="code" class="java">import java.util.Scanner;//Scanner is in the java.util package

public class ComputeAreaWithConsoleInput {
	public static void main (String args []){
		//Create a Scanner object
		Scanner input = new Scanner(System.in);

		//Prompt the user to enter a radius
		System.out.print("Enter a number for radius:");
		double radius=input.nextDouble();

		//Compute area
		double area=radius*radius*3.14159;

		//Display result
		System.out.println("The area for the circle of radius "+radius+" is "+area);
	}
}