Hello,
This is my first real C++ program.  The program is used in crystallography to
calculate the d spacing, interzonal angles, and interplanar angles for a crystal
in any of the crystallographic systems.  It firsts asks for the crystal system
and then information such as unit cell distances and angles.  

I wrote it as a series of switches to test the type of crystal system you use
 and what you want to calculate.
It contains three functions to calculate d spacings, interplanar angles, and 
interzonal angles for all of the crystal systems.

Let me know what you think of the program and how my programming skills
can be improved.  The file crystal6.cpp is the original source code.  Please
give me acknowledgement if this code is going to be used within another
program.  The file crystal6.exe is a windows program which will calculate
crystal properties once and then terminate.  The file crystal7.exe is similar,
but it is written for Ms-dos.

You may use this program free of charge, but please email me with any of your
comments, bugs, and what you think of the style I programmed it in.
Thanks.
Gordon Vrdoljak
gvrdolja@nature.Berkeley.EDU
http://cafe.Berkeley.EDU/~gordon