import java.util.Scanner;
 
public class 9a
{
	// The main method
	public static void main( String args[] )
	{
		Scanner input = new Scanner(System.in);
 
		// declares and initializes the variables used to store user input.
		int n1;
		double radius, area;
 
		int counter = 0;
 
		for(n1 = 1; n1 <= 5; n1++)
			{
		// Get and store user input in variable num
		System.out.printf("Please enter the radius of circle %d : ", n1);
		radius = input.nextDouble();
		if (radius < 0) {
		System.out.println("This is an error, a radius can not be negative.");
		}
		else 
		{area=calcarea(radius);
		System.out.printf("The circle with radius %d has area %d", radius, area);		
		}			
 
	}
 
 
	// end of main method
 
// end class
 
	public static Double calcarea()
{
 
	area = (radius * 3.14)^2;
	return(area);
	}
}