C program: infix to postfix

[gstercken]

p.s. this is due tomorrow at midnight (11/18 @ 11:59pm)

So it's probably too late by now... Anyway:

i don't know how to implement a switch in place of what i already have

Well, what do you already have? It would be easier to help if you posted the code (using code tags, please, and no bold type)...