c - implicit declaration of function itoa is invalid in c99

Question

When I try use the function itoa(), I get the warning:

implicit declaration of function is invalid in c99.

I have included stdlib.h on my header. I'm trying to call this function inside a function, I'm not sure if this is allowed.

Answer 1

The problem is that itoa() isn't a standard function.

You should take a look at this link which gives you some alternative implementations