Area and Circumference of the Circle Using JOptionPane in Java

 Machine Problem

 Write a program that input from the user the radius of a circle as an integer and prints the circle's circumference and area using the predefined constant Math.PI.

Use the following formulas (r is the radius):

circumference = 2 PI r

area = PI r 2

 

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Program Listing

Area_Circle.java

/* Write a program that input from the user the radius of a circle

as an integer and prints the circle's circumference and area

using the predefined constant Math.PI.

Use the following formulas (r is the radius):

circumference = 2 PI r

area = PI r 2

 * 

 */

import javax.swing.JOptionPane;

import java.text.DecimalFormat;

import java.lang.Math;  

public class Area_Circle {

private static final DecimalFormat df = new DecimalFormat("0.00");

public static void main(String[] args) {

// TODO Auto-generated method stub

// TODO Auto-generated method stub

  String r = 

         JOptionPane.showInputDialog( "Enter the radius of the circle:  " );

       double radius = Double.parseDouble(r); 

                  

     //Area = PI*radius*radius       

      double area=(Math.PI*(radius*radius));  

      //Circumference = 2*PI*radius

      double circumference= Math.PI * 2*radius;

      

      JOptionPane.showMessageDialog( null,  "The Area of the Circle :  " + df.format(area) + "\n"

        + "The Circumference of the Circle :  " + df.format(circumference)

        , "The Result", JOptionPane.INFORMATION_MESSAGE );

}

}