[Johnny got his gun]

You have a lot of tag mismatch.

You do this: float:variable, when you really should do: Float:variable.
Not the big F. :-)

Also the functions that should return floats should be created like this:

Float:thisfunctionreturnsafloat() {
    return 5.0;
}

anotherfunctino() {
    new Float:floatvalue = thisfunctionreturnsafloat()
}