image from www.codeproject.com On the last day of our class for the first semester, our instructor gave us an assignment about infix, postfix and prefix.  The assignment was to create a program that converts infix equations to its postfix form and prefix form.  I search around the net and the resources are so few that it took me days to have a sample program in C.  I am not that good in C programming but I can create C++ or