Search:

Hmm... I cannot replicate your error. However, my compiler does complain about this line:

float Speed[];
Did you forget to specify the size of the array?

Post the smallest and simplest program that you expect will compile but which demonstrates the error. At the moment, I could ask if say, you placed the prototype in the wrong place, but having to...

Is your program in just one source file? If not, the problem is probably that you did not compile and link all your source files, e.g., because you forgot to include them when running the compiler,...