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─────Run-Time Library───────────────────────────────────────────────────────
 
     The ferror routine (implemented both as a function and as a macro)
     tests for reading or writing errors on the file associated with
     <stream>. If an error has occurred, the error indicator for the
     stream remains set until the stream is closed or rewound, or until
     clearerr is called against it.
 
     Return Value
 
     If no error has occurred on <stream>, ferror returns 0. Otherwise,
     it returns a nonzero value.
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