There is no add function in standard C. If a tutorial includes a function call like add(3,4), then either they have defined the function somewhere in the tutorial (like Frank Caggiano has done in his example), or they defined it in a previous tutorial and are simply assuming that you are using everything previous done (which is poor practice in my opinion...)
The mathematical functions provided in standard C are defined in the header file math.h. In the terminal, you can type "man math" to get teh manual page describing this header. Otherwise, the binary math operators +, -, etc, etc are used exactly as they would be in normal infix arithmetic.
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