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End-of-File
It is a macro constant definition. It expands to a negative integral constant expression.
It is used as the value returned by several <cstdio> functions to indicate failure, either because the End-of-File has been reached in a reading operation or because an error happened.
See also
| feof | Check End-of-File indicator (function) |
| ferror | Check error indicator (function) |
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