Compute the Area of the Circle in Java

Here is one of the oldest code in Java when I start learning how to program on it to compute the area of the circle in this example I am still using buffered reader in order to accept input values from the user.

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Program Listing

import java.io.*;

public class area_circle {

public static void main(String [] args) throws Exception

{

BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

int radius=0;

double pi, area;

System.out.println("Compute Area of a Circle\n");

System.out.print("Enter a value for radius: ");

radius = Integer.parseInt(input.readLine());

pi = 3.1416;

area = (pi * (radius * radius));

System.out.println("\nThe value for radius is: " + radius);

System.out.println("\nThe value for pi is: " + pi);

System.out.println("\nThe area of a circle is: " + area + "\n\n\n" );

System.out.println("\n\n\n" );

System.out.println("End of Program" );

}

}