about including header files

[yacson]

Hi everybody.
what happens if a "header include" is missing? because I unexpectedly notice
that  this code:
main()
{printf("hello");}

works in linux(at least on my (mandriva spring 2007 )box) while it does not
in windows(turbo C++).
so finally, can I say :  #include <stdio.h> is not always necessary!

another question is : where does the compiler (or the linker) find the
actual code of printf (whether or not one has written its prototype)
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