public class Circle2

//
// ************************************************
//
//      Philip J. Porvaznik
//
//      Java programming I
//
//      Finds diameter, circum, area of a circle
//
//      problem #4 page 172
//
// ************************************************
//

{

  public static void main (String[] args)

  {

    // Radius is the radius of the circle
    // Diam is diameter
    // Circum is circumference
    // Area is area of circle

    double Radius = 6.75;
    double Diam;
    double Circum;
    double Area;

    // PI is constant 3.14159

    final double PI = 3.14159;

    // calculate diameter

    Diam = 2 * Radius;

    // calculate circumference

    Circum = PI * Diam;

    // calculate area

    Area = PI * Radius * Radius;

    // display intro message

    System.out.println("This program calculates Diameter, Circumference, and Area of a circle");

    // round off all values to 5 digits

    Radius = (double)((int)(Radius * 100000.0 + .5)) / 100000.0;

    Diam = (double)((int)(Diam * 100000.0 + .5)) / 100000.0;

    Circum = (double)((int)(Circum * 100000.0 + .5)) / 100000.0;

    Area = (double)((int)(Area * 100000.0 + .5)) / 100000.0;

    // display the result

    System.out.println("Radius constant = " + Radius);
    System.out.println("Diameter = " + Diam);
    System.out.println("Circumference = " + Circum);
    System.out.println("Area = " + Area);

    // display end message

    System.out.println("End of program");

  }

}