05/09/15 16:28:36
Incompatibilities Between ISO C and ISO C++, David R. Tribble
URLﾘﾝｸ(david.tribble.com)
・ Implicit function declarations
> C++ does not allow implicit function declarations. It is invalid to call a function
> that does not have a previous declaration in scope.
>
> C99 no longer allows functions to be implicitly declared.
> The code above is invalid in both C99 and C++.