public static void main(String args[]) throws Exception {
InputStreamReader inputstreamreader = new InputStreamReader(System.in);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
System.out.print("Enter the radius: ");
String s = bufferedreader.readLine();
Double double1 = new Double(s);
double d = double1.doubleValue();
System.out.println("The area of a circle of radius " + d);
double d1 = Math.PI * d * d;
System.out.println(" is " + d1);
}
}