D - 圆的面积_Java

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本文提供了一个简单的Java程序，用于计算给定半径的圆的面积。输入为一系列圆的半径，输出则是每个圆对应的面积，精确到小数点后两位。

Description

Give you the radius of a circle，caculate its area，PI=3.141592653。

Input
The first line of the input is a positive integer N,then follows N lines,each line is a real number represent the radius of the circle.

Output

Output contains N lines,for each line of the input you should output one line, Case K: S,and K(count from 1)represents the number of the circle and S is the area.Keep two digits after the decimal point.

Sample

Input
3
1
2
3

Output
Case 1: 3.14
Case 2: 12.57
Case 3: 28.27

import java.util.Scanner;

class Math1 {
	final double PI=3.141592653;
	
	public double circle(int n) {
		double x;
		x=n*n*PI;
		return x;
	}
	
}

public class Main {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		
		Math1 math = new Math1();
		int n=input.nextInt();
		for(int i=1;i<=n;i++) {
			System.out.println("Case "+i+": "+String.format("%.2f", math.circle(input.nextInt())));
		}
		
		input.close();
	}
}