Support all common mathematical expressions Support arithmetic, logic and bitwise operations Report syntax error in expressions Support common control flow in programming languages like for, while, if etc. Return value is numeric value or string Allow custom variables and functions Have many built-in functions Support long integers Comes with documentation full of examples, as well as ready-to-compile/run sample programs Visit Plenty of Software http://www.plentyofsoft.com/, you can review and download a lot of newest shareware or free software!