 This package include:
 calc.prg  -       source code of function Calcul

 Just put a line
  SET KEY 28 TO CALCUL
 to your code - and your application will have a built-in calculator.

 Used keys -
  ESC - Quit,
  F10 - Exit and place rezult to keyboard buffer,
  +,-,*,/ - arithmetic operarions,
  Space - clear buffer,
  Ctrl+F1, Ctrl+F2, Ctrl+F3 - Store buffer to first, second, third memory item,
  F1, F2, F3 - Get value from first, second, third memory item.
  F9 - set number of decimal digits after '.' (default - 2).

 This software is FREEWARE.
 I'll be glad to get by email your opinions and suggestions.

 (C) Alexander Kresin
 mailto:alex@belacy.belgorod.su
 http://members.xoom.com/alkresin/  