This category contains C Interview Questions and Answers

How can I determine the byte offset of a field within a structure?

ANSI C defines the offsetof() macro, which should be used if available;
If you don't have it, one possible implementation is

#define offsetof(type, mem) ((size_t) \ ((char *)&((type *)0)->mem - (char *)(type *)0))

This implementation is not 100% portable; some compilers may legitimately refuse to accept it.

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