EOF - end of file or error indicator

       Programs can't pass this value to an output function to "write" the end of a  file.   That  would  likely
       result in undefined behavior.  Instead, closing the writing stream or file descriptor that refers to such
       file is the way to signal the end of that file.

EOF represents the end of an input file, or an error indication.  It is a negative value, of type int.

       EOF  is  not  a  character  (it  can't  be represented by unsignedchar).  It is instead a sentinel value
       outside of the valid range for valid characters.

       C89, POSIX.1-2001.

       Standard C library (libc)

       EOF - end of file or error indicator

feof(3), fgetc(3)

Linux man-pages 6.9.1                              2024-05-26                                        EOF(3const)

       C11, POSIX.1-2008.

#include<stdio.h>#defineEOF  /* ... */