Equation solver algorithms

Anyone know of a DLL or something that lets you input a mathematical equation in the form of a string and it returns the numerical answer?

preferably freeware if possible.

[Chris]

Here just have a lot of Math stuffs & this may be the one that you looking for... But you need to modified a bit because it not a class module..

http://www.planet-source-code.com/vb...txtCodeId=5468