/* 
 * File: AreaOfCircle.java
 * ---------------------
 * This program prompts for the radius of a circle,
 * then prints the area of the circle.
 *
 * Author: CS1MD3, Sept. 2008
 */

import acm.program.*;

public class AreaOfCircle extends ConsoleProgram {
	
   public void run() {
      println("This program calculates the area of a circle.");		
      double r = readDouble("Enter radius: ");	//* Prompts for radius
      double a = PI*r*r;       //* Computes the area by the formula
      println("The area of the circle is " +  a + ".");
   }

   /* constant PI */
    private static final double PI = 3.1415926535897932;
}