Calculate Circle Perimeter - Java Language Basics

Java examples for Language Basics:int

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Introduction

Perimeter of a circle is 2 * pi * r

where r is a radius of a circle.

Demo Code

 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class Main {
 
        public static void main(String[] args) {
               /* www  .  java 2 s .c o m*/
                int radius = 0;
                System.out.println("Please enter radius of a circle");
               
                try
                {
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                        radius = Integer.parseInt(br.readLine());
                }catch(NumberFormatException ne)
                {
                        System.out.println("Invalid radius value" + ne);
                        System.exit(0);
                }
                catch(IOException ioe)
                {
                        System.out.println("IO Error :" + ioe);
                        System.exit(0);
                }

                double perimeter = 2 * Math.PI * radius;
               
                System.out.println("Perimeter of a circle is " + perimeter);
        }
}

Result


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