Complete the code segment to find the perimeter and area of a circle given a value of radius. You should use Math.PI constant in your program. If radius is zero or less than zero then print " please enter non zero positive number ".

 import java.util.Scanner;  

public class Exercise1_1 {

       public static void main(String[] args) {

Scanner s = new Scanner(System.in); 

       double radius= s.nextDouble();

       double perimeter;

       double area;

//Calculate the perimeter 

  //Calculate the area

// final double PI = 3.14159;

  perimeter = 2 * Math.PI * radius;

  area = Math.PI * radius * radius;

System.out.println(perimeter);

System.out.print(area);

    if(radius == 0)

    {

        System.out.println(" please enter non zero positive number "); 

    }

 }

}