void * pointers
C allows pointers to be declared as of type void *, which means
that they can be pointed at any type of item. This is useful in defining
calloc, malloc etc. but is clearly unsafe if widely used
in user programs.
Before a void * pointer can be dereferenced, it must be
cast to a pointer of known type, using the usual
casting operator (). C makes no check to ensure that this is done
consistently and great care must be taken at this point.
Next - Accessing structs and unions via pointers.
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