The equation parser-calculator for COMPLEX number math expressions with parse-tree builder and user-friendly interface for parsing and calculation a run-time defined math complex expression.
The math expressions is represented as string in a function style
F(x1, x2,..., xn) =f(x1, x2,..., xn)
F(x1, x2,..., xn) - declares number and names of the variables;
f(x1, x2,..., xn) - math expression may contain: