How does printf really works?

Question

I don't mean the formatted printing.
I mean the "printing"!
How does it happen in printf or other functions (if there's a function)?

Answer 1

http://www.equestionanswers.com/c/c-printf-scanf-working-principle.php

Answer 2

Knowing more and more is always better AJ #Infinity Love

Answer 3

I don't think you need to know about how it works. The creator of langauge defined that this function will work for this purpose, that function will work for that purpose. So you just need to know how to use this functionality and where to use.