All Notes on BCA

import java.io.*;
import java.*;


abstract class Myclass
{
abstract void calc(float n);
 }

class square extends Myclass
{
 void calc(float n)
  {
   System.out.println("Square of Number is : "+(n*n));
   }
 }

class cube extends Myclass
{
 void calc(float n)
  {
   System.out.println("Cube of Number is : "+(n*n*n));
   }
 }

class four extends Myclass
{
 void calc(float n)
  {
   System.out.println("Four times of Number is : "+(n*n*n*n));
   }
 }

class calculation
{
 public static void main(String args[])
  {
    square s = new square();
    cube c = new cube();
    four f = new four();

     s.calc(5);
     c.calc(5);
     f.calc(5);
   }
 }

OUTPUT
Square of Number is : 25.0
Cube of Number is : 125.0
Four times of Number is : 625.0