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fwrite
[write array elements]

    SYNOPSIS
    #include <stdio.h>
    size_t fwrite(const void *buf, size_t size size_t count,|
                                                       FILE *fp);

DESCRIPTION
fwrite attempts to copy, starting from the memory location, buf, count elements (each of size, size) into the file or stream identified by fp. fwrite may copy fewer elements than count if an error intervenes.

fwrite also advances the file position indicator (if any) for fp by the number of characters actually written.

RETURNS
If fwrite succeeds in writing all the elements you specify, the result is the same as the argument, count. In any event, the result is the number of complete elements that fwrite copied to the file.

COMPLIANCE
ANSI C requires fwrite.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.