- /*
- Calculate Circle Area using Java Example
- This Calculate Circle Area using Java Example shows how to calculate
- area of circle using it’s radius.
- */
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStreamReader;
- public class CalculateCircleAreaExample {
- 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(newInputStreamReader(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);
- }
- }
- /*
- Output of Calculate Circle Area using Java Example would be
- Please enter radius of a circle
- 19
- Area of a circle is 1134.1149479459152
- */
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