Thread: Infix to postfix stack class problem

I am implementing a stack class to convert infix expressions to postfix expressions.
Program runs when I enter : (A*(B+C))
for example and gives me the correct ABC+*
But when I randomly entered (5+3)*3, I got a seg fault.

I suspect it's something in the actual algorithm.
Any ideas?
Here is the relevant code.

Edit: Code removed

Any ideas or pointers would be appreciated