The superclass Calculator contains: a protected double instance variable, accumulator, that contains the current value of the calculator. Write a public subclass CalculatorWithMemory, based on Calculator, a double instance variable, memory, initialized to 0 a method, save, that assigns the value of accumulator to memory a method, recall, that assigns the value of memory to accumulator a method, clearMemory, that assigns zero to memory a method, getMemory, that returns the value stored in memory

The following program are written in JAVA Programming Language.

//inherit the Calculator class

public class CalculatorWithMemory extends Calculator {

private double memory = 0.0; / /initialize double type variable

public void save () { / /define function

memory = accumulator;

}

public void recall () { / /define function

accumulator = memory;

}

public void clearMemory () { / /define function

memory = 0; / /initialize the value

}

public double getMemory () {

return memory; / / return the value in "memory" variable

}

}

Explanation:

Here, we inherit the property of the "Calculator" class.

Then, we define the private double type variable "memory" and assign value 0.0.

Then we set the function "save () " inside it we assign the value of "memory" in "accumulator" and close the function.

Then, we define the function "recall () " inside it we assign the value of "accumulator" in "memory" and close the function.

Then we set the function "clearMemory () " inside it we assign "memory" to 0.

After all, we set the double type function "getMemory () " inside we return the value of the "memory".