Source of CircleDemo.java

Structures and functions

public class CircleDemo

  1: 
  2: import java.util.*;
  3: 
  4: public class CircleDemo
  5: {
  6:     public static void main(String[] args)
  7:     {
  8:         double radius;
  9: 
 10:         System.out.println(
 11:           "Enter the radius of a circle in inches:");
 12:         Scanner keyboard = new Scanner(System.in);
 13:         radius = keyboard.nextDouble( );
 14: 
 15:         System.out.println("A circle of radius "
 16:                                       + radius + " inches");
 17:         System.out.println("has an area of " +
 18:              CircleFirstTry.area(radius) + " square inches,");
 19:         System.out.println("and a circumference of " +
 20:              CircleFirstTry.circumference(radius) + " inches.");
 21:     }
 22: }