- 4 operators: + - * /
- Decimal point
- Positive/negative number switch
- Backspace function
- Full keyboard/numpad suppport
- Current/previous operation display
- Buttons with visual feedback
- Can handle extra large numbers through the use of the Big_Decimal class and scientific notation
Positive/negative: F10
Decimal point: F11 / EN period / RU period / Numpad decimal
Backspace: F12 / Backspace