//
// ************************************************
//
//      Gregg L. Zepp II
//
//      Intro to Java Programming
//
//      Finds diameter, circumference, and area of
//      a circle when given the radius
//
//      HW #1, Exercise 2.28 P. 79
//
// ************************************************
//
import java.util.Scanner; // program uses class Scanner
public class Circle
{
   public static void main(String args[]) // begins execution of Java application

   {
      Scanner input = new Scanner( System.in ); // create Scanner to obtain user input
      int radius; // circle's radius input by user

      // display intro message
      System.out.println("\nThis program calculates the Diameter, Circumference, and Area");
      System.out.println("of a circle when given it's radius.\n");

      System.out.print( "Enter circle's radius: " ); // prompt 
      radius = input.nextInt(); // read radius from user

      // display the results
      System.out.printf("Radius is %d\n", radius);
      System.out.printf("Diameter is %d\n", (2 * radius));
      System.out.printf("Circumference is %f\n", (2 * Math.PI * radius));
      System.out.printf("Area is %f\n\n", (Math.PI * (Math.pow(radius,2))));

      System.out.println("End of program"); // display end message

   } // end method main

} // end of program