Extend your Calculator Version 4 project by fulfilling the specs of Prof. Hagerty's Assignment #2.

Sample Test Case:

• inputs and outputs where outputs are typed in square brackets
  
  3, a, test, [3]
  4, Enter, a, +, [7]
  another label should show       a = 3
  

You must hand in the following papers stapled in this specified order:

1. CalculatorBrain.m
2. CalculatorBrain.h
3. CalculatorViewController.m
4. CalculatorViewController.h

Turn in the project folder by copying it to your network HandIn folder.

Also, call the instructor to your computer and execute the program for him for a run-time grade.