Initial Commit
A far less embarrassing attempt at a simple calculator.
All basic math operations are working and a sign changer button has been added. Equals even works!! \o/
Adds the ability to change sign and resolves bugs related to that feature.
If the value is an integer, don't show a decimal point.
Moved the Binop definition and related functions out of the ViewController to avoid initialization problems.
Operator precedence works! At last!
Minor code formatting cleanup in the view controller.
Merge branch 'master' of github.com:ursooperduper/calculator