CSCI 2380 homework:

Create a new class called Calculator.  A calculator should be able to add, subtract, multiply, divide and clear.  Test your calculator by writing a main program incorporating the test code below:


int main()
{
	Calculator mycalc;
	
	mycalc.clear();
	mycalc.add(4.52);
	mycalc.add(3.789);
	mycalc.divide(2.6);
	mycalc.multiply(3.12);
	mycalc.subtract(2.678);
	cout << mycalc.display() << endl;       // prints out "7.2928"
	mycalc.clear();
	mycalc.add(5.0);
	cout << mycalc.display() << endl;       // prints out "5"

	// add a constructor
	Calculator calc1;
	cout << calc1.display() << endl;  //prints out 0

	// add a parameterized constructor
	Calculator calc2(5);
	cout << calc2.display() << endl; //prints out 5

	// Define calculator addition (overload the '+' operator)
	Calculator calc3(7);
	calc1 = calc2 + calc3;
	cout << calc1.display() << endl;  //prints out 12

	//advanced stuff #1 (extra credit challenge): Create an 'undo' method for the calculator
	mycalc.undo();
	mycalc.undo();
	cout << mycalc.display()<< endl;  //prints out 7.2928

	//advanced stuff #2 (extra credit challenge): Create a 'redo' method for the calculator
	mycalc.redo();
	mycalc.redo();
	cout << mycalc.display()<< endl;  //prints out 5

	return 0;
}