hey u guys i need a code for the following :

Some one writes a + or - or * or / into a text box there are

4 such text boxes and in between of those numbers like: (the [ ] stand for a text box):

example:
[ 2 ] [ - ] [ 3 ] [ + ] [ 5 ][ / ] [ 1 ]

now how do i get the computer to solve that?

im sure its easy cause i think i have done it before i just cant remember it now, thanks a lot

I hope i didn't make it confusing