Calculator

A Scientific and Engineering Calculator with large buttons AND functionality.

0.78 Update:
- Saves data better
- Hitting CE/C twice does AC
- Inverse tangent is now correct

Features:
- Trigonometry
- MOD (modulo)
- Binary, Octal and Hexadecimal
- View Fractions (F<->D)
- '2nd' button

Comments and suggestions welcome.