Java Swing - Finding diameter and circumfernce a circle

  

               The program calculates the diameter ( by multiplying the radius by 2), and then calculates the circumference (by multiplying the diameter by 3.14). The program prints both the diameter and the circumference.

Java code:

import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public class I_C_2 

{

    public static void main (String args[])

    

    {

        // Declaring  variables

        String radius_strg;

        double radius,diameter, cirm;

        double pi = 3.14;

        DecimalFormat formatter = new DecimalFormat("#.00");

        

        // Prompt user to input by dialogbox

        radius_strg = JOptionPane.showInputDialog(null,"Enter Radius: ");

        

        // Convert string value into double

        radius = Double.parseDouble(radius_strg);

        

        // Compile diameter

        diameter = radius * 2;

        

        // Compile circumfernce

        cirm = diameter * pi;

        

        // Output : Displaying the result diameter and circumfernce in Message Dialogbox

        JOptionPane.showMessageDialog(null," The Diameter is " + formatter.format(diameter) + "\n\r" + "The Circumfence is " + formatter.format(cirm));

        

        } // end of the main clause

     } // end of the program

Result : Click me for result