Write a program that uses the class Calculator in listing to create a more powerful calcul...

Write a program that uses the class Calculator in listing to create a more powerful calculator. This calculator will allow you to save one result in memory and call the result back. The commands the calculator takes are

• e for end

• c for clear; sets result to zero

• m for save in memory; sets memory equal to result

• r for recall memory; displays the value of memory but does not change result

You should define a derived class of the class Calculator that has one more instance variable for the memory, a new main method that runs the improved calculator, a redefinition of the method handleUnknownOpException, and anything else new or redefined that you need. A sample interaction with the user is shown next. Your program need not produce identical output, but it should be similar and just as clear or even clearer.

Calculator on:result = 0.0+ 4result + 4.0 = 4.0updated result = 4.0⁄ 2result ⁄ 2.0 = 2.0updated result = 2.0mresult saved in memorycresult = 0.0+ 99result + 99.0 = 99.0updated result = 99.0⁄ 3result ⁄ 3.0 = 33.0updated result = 33.0rrecalled memory value = 2.0result = 33.0+ 2result + 2.0 = 35.0updated result = 35.0eEnd of program