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664: Sidetrip

Of course, you always include other header files, such as stdio.h, for functions supplied by C standard libraries. Consequently, when the C compiler links object files to create an executable program, it encounters functions for which it has seen function prototypes but no corresponding function definitions. Whenever that happens, the C compiler looks for the appropriate object code in a standard library file. The location of this standard library file generally is provided to the compiler when the compiler is installed.