Stack eval gives wrong output

[gumbe4]

I wrote a program in C++ that requires my program to read a textfile which should only contain standard arithmetic operations and then to output the results of the operations into a new textfile. My program compiles and runs, but my output is wrong. I have been working on this program too long and think it's an easy fix, any help would be greatly appreciated here is the link to the program and a text file that can be used http://wikisend.com/download/299786/COSC2320-hw-stackFunctOps.zip