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How is the working of file I/O error handling functions associated with error-status flags?

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The error-status flags store the information on the status of a file that is being currently used. The current state of the I/O system is held in an integer, in which the following flags are encoded:

Name Meaning
eofbit 1 when end-of-file is encountered, 0 otherwise.
failbit 1 when non-fatal I/O error has occurred, 0 otherwise. 
badbit 1 when fatal I/O error has occurred, 0 otherwise.
goodbit 0 value

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