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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.