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Problem 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
Sample Output
Case 1: 3.14
Case 2: 12.57
Case 3: 28.27
import java.util.Scanner;
import javax.print.attribute.standard.PrinterLocation;
public class Main
{
public static void main(String[] args)
{
Scanner reader = new Scanner(System.in);
int n=reader.nextInt();
for(int i=1;i<=n;i++)
{
int x=reader.nextInt();
Size S=new Size(x);
double y=S.div();
System.out.printf("Case %d: %.2f\n",x,y);
}
reader.close();
}
}
class Size
{
int x;
public Size(int x)
{
this.x=x;
}
public double div()
{
return 3.141592653*x*x;
}
}