powellcj12/RPNCalculator — Issue #3: Add +/- Operation
Author: powellcj12
Created: 2012-02-22 06:50:07+00:00
State: open
Labels: new feature

Extra Credit 3: Add a +/- operation which changes the sign of the number in the `display`. Be careful
with this one. If the user is in the middle of entering a number, you probably want to
change the sign of that number and let them continue entering it, not force an
`enterPressed` like other operations do. But if they are not in the middle of entering a
number, then it would work just like any other single-operand operation (e.g. `sqrt`).