1_Sona的绯闻男友的博客

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import java.text.Format;
import java.util.Scanner;


class circle{
	int r;
	circle (int r){
		this.r=r;
	}
	public double area(){
		return Math.PI*r*r;
	}
}
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int r,n,i;
		Scanner sc = new Scanner(System.in);
		n=sc.nextInt();
		for(i=0;i<n;i++){
		r = sc.nextInt();
		circle c1 = new circle(r);
		System.out.print("Case "+(i+1)+": ");
		System.out.println(String.format("%.2f",c1.area()));
		}
	}

}
import java.text.Format;
i