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─────Run-Time Library───────────────────────────────────────────────────────
 
     The fclose function closes the given <stream>. The _fcloseall
     function closes all open streams except stdin, stdout, and stderr
     (and in DOS, _stdaux, and _stdprn). It also closes and deletes
     any temporary files created by tmpfile.
 
     In both functions, all buffers associated with the stream are
     flushed to the operating system prior to closing. System-allocated
     buffers are released when the stream is closed. Buffers assigned
     with setbuf and setvbuf are not automatically released.
 
     Return Value
 
     The fclose function returns 0 if the stream is successfully
     closed. The _fcloseall function returns the total number of
     streams closed. Both functions return EOF to indicate an error.
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