Hello NG,
Is EOF an actual character with an ASCII code, or is it an implicit
character?
Thanks,
Dave 10 7528
Dave wrote: Hello NG,
Is EOF an actual character with an ASCII code, or is it an implicit character?
That is system dependant.
I think most modern system now indicate eof when there is no more data
to be read.
Earlier systems (like cpm and msdos) had a ^Z character to indicate end
of file.
Dave wrote
: Hello NG,
Is EOF an actual character with an ASCII code, or is it an implicit character?
No it is not part of ASCII code, it is a convention, the numeric value
returned/accepted by functions indicating that the end of a file is reached.
It is usually -1.
--
Ioannis Vranos http://www23.brinkster.com/noicys
Ioannis Vranos wrote: Dave wrote :
Hello NG,
Is EOF an actual character with an ASCII code, or is it an implicit character? No it is not part of ASCII code, it is a convention, the numeric value returned/accepted by functions indicating that the end of a file is reached.
It is usually -1.
And it's an *int*!
HTH,
--ag
--
Artie Gold -- Austin, Texas http://it-matters.blogspot.com (new post 12/5) http://www.cafepress.com/goldsays
On Sun, 23 Jan 2005 12:38:51 -0800 in comp.lang.c++, Gianni Mariani
<gi*******@mariani.ws> wrote, Earlier systems (like cpm and msdos) had a ^Z character to indicate end of file.
And all the way to current MS Windows systems. Likewise ^D indicates
end of file in some Unix contexts. However, that has no relation to
the C and/or C++ standard #define EOF
EOF is a special value returned from fgetc() etc. that specifically is
outside the range of values of a char.
David Harmon wrote: On Sun, 23 Jan 2005 12:38:51 -0800 in comp.lang.c++, Gianni Mariani <gi*******@mariani.ws> wrote, Earlier systems (like cpm and msdos) had a ^Z character to indicate end of file.
And all the way to current MS Windows systems. Likewise ^D indicates end of file in some Unix contexts. However, that has no relation to the C and/or C++ standard #define EOF
EOF is a special value returned from fgetc() etc. that specifically is outside the range of values of a char.
It's also the return value of char_traits<char>::eof(), and as such plays an
important (but not very exciting) role in the C++ iostreams framework.
Jonathan
David Harmon wrote: EOF is a special value returned from fgetc() etc. that specifically is outside the range of values of a char.
It usually is, but that's not required. On a platform where int and char
have the same size, it wouldn't be possible to find an int value that is
not also a valid value for a char. That's why there is also the function
feof().
> >Earlier systems (like cpm and msdos) had a ^Z character to indicate end of file.
And all the way to current MS Windows systems. Likewise ^D indicates end of file in some Unix contexts. However, that has no relation to the C and/or C++ standard #define EOF
It does have a relation, because some compilers generate an EOF when ^D or
^Z is encountered. The ASCII name for ^D is "End of transmission" and is
also used for indicating end of file on Macs.
Niels Dybdahl
> >Earlier systems (like cpm and msdos) had a ^Z character to indicate end of file.
And all the way to current MS Windows systems. Likewise ^D indicates end of file in some Unix contexts. However, that has no relation to the C and/or C++ standard #define EOF
It does have a relation, because some compilers generate an EOF when ^D or
^Z is encountered. The ASCII name for ^D is "End of transmission" and is
also used for indicating end of file on Macs.
Niels Dybdahl
> >Earlier systems (like cpm and msdos) had a ^Z character to indicate end of file.
And all the way to current MS Windows systems. Likewise ^D indicates end of file in some Unix contexts. However, that has no relation to the C and/or C++ standard #define EOF
It does have a relation, because some compilers generate an EOF when ^D or
^Z is encountered. The ASCII name for ^D is "End of transmission" and is
also used for indicating end of file on Macs.
Niels Dybdahl This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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