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 ? =)

>>32
I consider having no function prototype as having the arguments not yet specified. If somebody has written the prototype, and there are no arguments; why assume they ``are yet to be specified."