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`fwrite'--write array elements

     #include <stdio.h>
     size_t fwrite(const void *BUF, size_t SIZE,
         size_t COUNT, FILE *FP);
`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.
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.
ANSI C requires `fwrite'.
   Supporting OS subroutines required: `close', `fstat', `isatty',
`lseek', `read', `sbrk', `write'.