Compiling PhysCalc:

	PhysCalc is contained in the following source files:

	physcalc.h		Header: global stuctures, defines,
						includes & declarations
	physdecl.h		Header: function declarations
    physmain.c		Main program, functions to do commands
	physnode.c		Functions for manipulating tree nodes
    physsolv.c		Recursive descent parser & evaluator
	physconv.c		Code to do unit conversion &
						manipulation
	physoper.c		Code to perform operators & buit in
						functions
	physmlib.c		Stuff from my library of C functions
    makefile        Makefile for use with Borland's MAKE

	To create an executable file, compile each .C module and
link them all together with the standard libraries.

    PhysCalc is used to be compatible with DeSmet C 3.0 and
Turbo C 2.0.  I don't know if it is any more, since I am now
compiling it with Borland C 3.1, Microsoft Visual C++ 4.0
and GNU C 2.7.2.

Compatability points:

    * This program sticks close to standard K&R C.
    * enumerated types & function prototyping are not used.  For some
        compilers, prototyped forward declarations are declared.
	* Functions clrscr(), pause_for_user() [physmain.c], and
		initnodes() [physnode.c] will probably need
		alteration.  Initnodes() is called to do any memory
		setup routines needed.	This function should make
		sure there is enough stack, and do any setup that
		malloc() may require.
	* To evaluate larger expressions, a fair amount of stack
        space is needed. (No longer a worry on 32 bit machines.)
    * You will almost certainly get warning messages from
        modern C compilers.


    To compile properly under DeSmet C, the macro
__DESMETC__ must be defined.  I put the line:

		#define __DESMETC__ 0x303

in DeSmet's STDIO.H file.