Short: Floating point expression evaluation.V1.12

Eval		A full-featured floating point expression evaluator that
		can assign variables, has many built-in functions and
		constants, allows input and output in any number base, and
		uses a C-like syntax for expression evaluation.  Full ANSI
		C source is included and easily portable to other platforms.
		Version 1.12, includes source.
		Author:  Will Menninger