How to calculate the perimeter of a circle

Do you need help with your Java programming?

Click here for instant help with your Java code.

This example shows how to calculate the perimeter of a circle.
First we ask the user for the radius of the circle.
The input is parsed to an integer value and finally we calculate the perimeter using the correct formula.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
*
* @author javadb.com
*/
public class Main {

    /**
     * Calculates the perimeter of a circle
     */
    public static void main(String[] args) {

        int radius = 0;
        System.out.println("Please enter the radius of a circle");

        BufferedReader reader = null;
        try {
            //get the radius from user input
            reader = new BufferedReader(new InputStreamReader(System.in));
            radius = Integer.parseInt(reader.readLine());

        } catch (NumberFormatException nfe) {
            nfe.printStackTrace();
            System.exit(0);
        } catch (IOException ioe) {
            ioe.printStackTrace();
            System.exit(0);
        } finally {
            try {
                reader.close();
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
        }

        double perimeter = 2 * Math.PI * radius;

        System.out.println("The circle perimeter is " + perimeter);

    }
}

Do you know your Java?
Take a Ten-Question-Java-Quiz!

Search for code examples on this site

Need help with your Java code? It's secure and confidential.

This is how it works:

Send a detailed description of what you need help with, the more details the better. Also provide a deadline for when it has to be finished. More time means better chance of putting your request into the schedule.

If the request is serious you will shortly receive an email with the price, to which you have to respond if you accept.

Once you have accepted, the work will begin on developing your code by an experienced Java developer. When the code is finished a link to a secure payment will be sent to you.

The source code is then sent to you once the payment is completed.

IMPORTANT! The request needs to be very detailed, else it may be ignored.

Write your detailed request here:

E-mail address: