Declaration:
size_t fwrite(const void * ptr,
size_t size, size_t
nmemb, FILE * stream);
Writes data from the array pointed to by ptr to the given
stream. It writes nmemb number of elements of size
size. The total number of bytes written is (size*nmemb ).
On success the number of elements written is returned. On
error the total number of elements successfully written (which
may be zero) is returned.
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