7 + -4 now works. Implemented the negative rational number functionality
into the working branch. I had to make a few changes to calculate
because it wasn't working so I will be commiting those changes to the
other branches as well. Next up: getting subtraction to work.
Made sure Damian's add was up to date. Commented out the testing prints
in UserIO.
Some organizational changes. Finally figured out why the includes were
fucking up with the Ops folder.
Multiply
Multiplication is working.
Implemented negative number recognition, providing the ~ functionality
which will be handled in calculation.
Implemented a negative functionality, adding a ~ character to the RPN,
which will be handled in the calculation
Subtract is functioning. UserIO has been rolled back from the "~"
version to the version that was working when Multiply was implemented.