09 April 2012

Calculate Area of a Circle




import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class CircleArea{
public static void main(String[] args) {
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 area = Math.PI * radius * radius;
System.out.println("Area of a circle is " + area);
}
}

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