Area Of A Circle

Calculate Circle Area using Java Example

1. /*

2.Calculate Circle Area using Java Example

3.This Calculate Circle Area using Java Example shows how to calculate

4.area of circle using it's radius.

5.*/

6.


7.import java.io.BufferedReader;

8.import java.io.IOException;

9.import java.io.InputStreamReader;

10.

11.public class CalculateCircleAreaExample {

12.


13.public static void main(String[] args) {

14.

15.int radius = 0;

16.System.out.println("Please enter radius of a circle");

17.


18.try

19.{

20.//get the radius from console

21.BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

22.radius = Integer.parseInt(br.readLine());

23.}

24.//if invalid value was entered


25.catch(NumberFormatException ne)

26.{

27.System.out.println("Invalid radius value" + ne);

28.System.exit(0);

29.}

30.catch(IOException ioe)

31.{


32.System.out.println("IO Error :" + ioe);

33.System.exit(0);

34.}

35.

36./*

37.* Area of a circle is

38.* pi * r * r

39.* where r is a radius of a circle.

40.*/

41.

42.//NOTE : use Math.PI constant to get value of pi

43.double area = Math.PI * radius * radius;

44.

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

46.}

47.}

48.

49./*

50.Output of Calculate Circle Area using Java Example would be

51.Please enter radius of a circle

52.19

53.Area of a circle is 1134.1149479459152

54.*/