sos help for understanding

[yacson]

Hi everybody.
Sorry, I'm a  new user and i want to understand why this c code work (in
linux I'm worling on mandriva 2009 spring)?
main()
{printf("hello,world");}

why does not the compiler complain about the missing stdio.h ? it just gives
"warning:incompatible implicit declaration of built-in function printf" and
actually prints the string "hello,world".
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