Voice Office/Kids calculator

VOCal is a classical office calculator with a virtual tape to print all operations. When operating in children mode, the additions, substractions and multiplications are presented in columns as children are used to compute. The optional voice option turns on/off the reading or spelling of the numbers and operations.

Common features:
* Common math operations (+, -, x, /, %, inv)
* One memory register
* Virtual tape presenting all executing operations
* Landscape/portrait layouts
* Left/right-handed landscape layouts
* Haptic feedback (optional)

Virtual tape features:
* Printing of executed operations
* Double press the C key to clear the tape
* Kid mode to print base operations using school layout
* Colored for easy reading

Voice features:
* May be turned on/off
* All keys are spelled
* All results are either spelled/read (option)
* Long tap a virtual tape line to read/spell the operation

See http://vocal.lsrodier.net for further details.