The superclass Calculator contains: a (protected) double instance variable , accumulator, that contains the current value of the calculator.
Write a subclass, CalculatorWithMemory, that contains: 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.
public class CalculatorWithMemory extends Calculator
{
private double memory = 0 ; // the memory is initialized to zero
public void save ( )
{
memory = accumulator ; // the value of accumulator assigned to memory
}
public void recall ( )
{
accumulator = memory ; // the value of memory again assigned to accumulator
}
public void clearMemory ( )
{
memory = 0 ; // here zero value assigned to memory
}
public double getMemory ( )
{
return memory ; // it returns the value stored in the memory
}
}
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