Calculator Requirements
Keypad buttons
Numbers ( 0 ... 9)
Close
Hide
Language
AC
Info
Negative (+/-)
Operations
*
+
-
=
%
Functionality
Data input methods
Clipboard
Keyboard
Manipulator
Possible input types
Decimal accuracy, rounding
Maximum length
Allowed input
System requirements
Maybe we should join this 2 blocks?
DirectX compatible
Application size (mb)
Memory (RAM)
CPU processor
Operating System
Error massages
Cannot divide by zero
Invalid input
Languages
Errors languages
Change languages
Default
UI
Error messages
Buttons interface
Application window (size, interface)
First launch
