#include <stdio.h> int ferror(FILE *f);
ferror tests whether the error flag has been set for the FILE
object addressed by f. This flag is set whenever an I/O function
fails for any reason. The error flag for a file remains set after an error
until it is cleared with clearerr.
ferror returns 0 if the error flag is not set and a nonzero value if the
error flag is set.
ferror(f) (where f addresses a FILE object for a file closed by
fclose) is nonzero. Other implementations may return 0 if ferror
is used on a closed file.
ferror is illustrated in the example for ftell.
clearerr, clrerr,feof
Copyright (c) 1998 SAS Institute Inc. Cary, NC, USA. All rights reserved.