I can tell just by reading that my implementation won't compile this. My implementation has no <cs50.h>. In addition, I've never seen a built-in GetFloat().
I have reason to believe that cs50.h is a project file. If this is the case, it doesn't belong between <these brackets> but instead between "these quotation marks".
I have reason to believe that GetInt() is declared and defined in cs50.h. Code shouldn't be defined in .h (header) files, but in .c files. Furthermore, "GetFloat()" seems a horrible Java-esque practise. The reason it's horrible in C is that C has no exceptions. By masking the return value of scanf, you are making error handling extremely difficult. I suggest studying this scanf manual
carefully before answering the following questions:
1. How would you describe the value that scanf returns on match failure?
2. How would you describe the value that scanf returns when stdin is EOF-marked, or some other error occurs?
3. What would be the only successful return value of a scanf call that is expected to write to 4 items?
Once you've studied that manual carefully, you shouldn't need to mask it behind GetFloat.