C strange warning.

http://pastebin.com/3js28CTR
$> gcc main.c
If tata(char|short|float c) => warning
If tata(int|long|double c) => nothing

Does somebody could explain why exactly ? =)

(void) looks better than () because, as functions take arguments, it clearly shows that the function's arguments are a total lack of arguments, or, there is a void where arguments would otherwise be.

(), on the other hand, just looks like the arguments are yet to be specified.