Error handling (CRT)

Use these routines to handle program errors.

Error-handling routines

Routine	Use
`assert` macro	Test for programming logic errors; available in both the release and debug versions of the run-time library.
`_ASSERT`, `_ASSERTE` macros	Similar to `assert`, but only available in the debug versions of the run-time library.
`clearerr`	Reset error indicator. Calling `rewind` or closing a stream also resets the error indicator.
`_eof`	Check for end of file in low-level I/O.
`feof`	Test for end of file. End of file is also indicated when `_read` returns 0.
`ferror`	Test for stream I/O errors.
`_RPT`, `_RPTF` macros	Generate a report similar to `printf`, but only available in the debug versions of the run-time library.
`_set_error_mode`	Modifies `__error_mode` to determine a non-default location where the C run time writes an error message for an error that will possibly end the program.
`_set_purecall_handler`	Sets the handler for a pure virtual function call.