if i'm out of all purpose flour can i use wheat flour instead?

You should be aware, however, that all-purpose flour IS wheat flour--wheat flour that has been refined and had the bran and germ removed. The other kind of flour that you're talking about is whole-wheat flour. But both are made from wheat.

Sure, you can use whole wheat instead of all purpose. The end product will be heavier. For delicate pastries--not optimal. For many other treats, you may actually like the nuttiness of whole wheat.