JAVA 1.1 To find the perimeter and area of a circle given a value of radius.

import java.util.Scanner;
      public class Exercise {
       public static void main(String[] args) {
       Scanner s = new Scanner(System.in);
       double radius= s.nextDouble();
       double perimeter;
       double area;
if(radius<=0)
 {
  System.out.print("please enter non zero positive number ");
 }
else
{
 perimeter = 2 * Math.PI * radius;
 area = Math.PI * radius * radius;
 System.out.println(perimeter);
 System.out.print(area);
}

}

}