area of circle

//area of circle

 class area

{

    public static void main(String[] args) {

 

 //enter a number  

 try{

 double j=new java.util.Scanner(System.in).nextDouble();

 

 System.out.println("Calculation involving circle\n"+"Enter a number as radius:"+" "+j+"\n");

 

 System.out.printf("%s %f \n\n","The diameter:",2*j);

 

 System.out.printf("%s %f %n %n","The circumference:",2*Math.PI*j); 

 

 System.out.printf("%s %f","The area of circle:",Math.PI*j*j);}

        

 catch (java.util.InputMismatchException e){

     System.out.print("Enter a number");

 }

 

 catch (Exception e){

     System.out.print("Please enter a number");

 }

 

 

    

}}