help analysing text

Hello, i am analysing text, and searching for some examplse of analysing text doing with windows from application,
I have a field in gui where i should type a math equatation like "7*(5+3)" and get the result. So i need to analyse it. Maybe anyone got an example?

I am a begginer of windows form application.
I've tried to explain how to write such thing in an older thread:
http://www.cplusplus.com/forum/beginner/36637/2/#msg201343

Hope this helps
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