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What are Head Files used in #include

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Last Modified: 2013-11-18
I have programming a little with C but have more knowlege with Pascal.

What it confused me is the head files usind in #include. When looking at them directly with the editor, seems like they are C language, not compiled libraries. That's why it confuses me...

For example the printf() is defined at the head file, but is that C language? Is it possible to change the definition to add more funtionality on it?

I think it is something like Uses clause at Pascal, but the Pascal libraries (obj) are compiled with assembly, C or even Pascal...

What about C? The libraries are not compiled at all and it is hard to understand them.

Thanks.
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