THIS CODE IS UNDER DEVELOPMENT AND NOT YET READY FOR USE!
 
"Calc3" is a re-implementation of ye olde perl calculator (qv calc
in this codecloset).  Calc1 and calc2 were developed very haphazardly
and without any thought to maintainability or expandability, so
calc3 is an attempt at a cleaner implementation with an eye towards
future extension, and inclusion and integration of similar
interactive clients I've cobbled together in recent years.

Calc3 introduces the concept of "modes", so that depending on which
mode the calculator is in, it could interpret C, perl, SQL, or shell
commands, though at the present only the "perl" mode is even 
marginally functional.  Though it is still primarily a calculator,
in time I aim to make calc3 my default shell.
 
Please go read the documentation (such as it is) for calc2 first.
Calc3 behaves like calc2 in its default mode.