Sunday, March 31, 2013

Calculate the Area of Circle | Java Program



package com.swain.cell;

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

public class CalculateCircleArea {

       public static void main(String[] args) {

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

              try {
                     // get the radius from console
                     BufferedReader br = new BufferedReader(new InputStreamReader(
                                  System.in));
                     radius = Integer.parseInt(br.readLine());
              }
              // if invalid value was entered
              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);
              }

              /*
               * Area of a circle is pi * r * r where r is a radius of a circle.
               */

              // NOTE : use Math.PI constant to get value of pi
              double area = Math.PI * radius * radius;

              System.out.println("Area of a circle is " + area);
       }

}

Java Quick Program

1. Write a Code to generate Random numbers public class GenerateRandomNumbers { public static void main(String[] args) { System.out...