fwrite
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The fwrite function writes up to <count> items, each of <length>
size, from <buffer> to the output stream. The file pointer
associated with <stream> (if there is one) is incremented by the
number of bytes actually written.
If <stream> is opened in text mode, each carriage return is
replaced with a carriage-return──line-feed pair. The replacement
has no effect on the return value.
Return Value
The fwrite function returns the number of full items actually
written, which may be less than <count> if an error occurs. Also,
if an error occurs, the file-position indicator cannot be
determined.
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