Hey, Are you trying to convert an Infix notation to Prefix notation? Well, if that will be the case then, you must consider the priority of each element that will be involved in the stack simulation. I think you must also consider the precedence of each operator while pushing and/or pop'n elements from the stack. So, if you can actually get my point, well you will be needing 2 stacks...1 for the input and the other for the temporary storage..... regards 7900142
