calculation

I'm sick right now and my head is a little foggy. I'm trying to parse a string containing mathematical "commands" for a calculator. I already have a parser to do simple math operations, but now I want to add stuff like sqrt{}, sin{}, cos{}, etc. So what I am trying to accomplish with this code...

Hey guys, I am new to C# and am actually writing my bachelor-thesis. Therefore I need to implement a module that is able to calculate volumes inside a STL - 3D - model. I already got a mathematical essay that describes how to calculate the volume and could implement on my own. However I need to...