Throughout the entire program -1 will always be zero. 0 will be the same as a blank. Cheat a bit and make the amount -2 and you should get a good result. 

I realize that... I tried -2 and it comes out as -2. I even tried -.459 to see what that would do. Not really sure how to make this truly print -1. It's annoying. But thanks for the tip! Truly appreciate it!