What is EOF in stdin?

[Majoni]

When reading characters from standard input what does it mean when you are asked to sop on hitting EOF in the input?

[Aia]

End Of File.
It is operating system depended.
In Windows for example is iqual to the value -1.

[Majoni]

Thanks,
Any idea what is the value of EOF in Linux

[Aia]

In Windows if you enter the keys Control + Z you get EOF, in Linux is Control + D I believe.
So, do a little code like

char ch = getchar();

and enter the EOF. Then

printf("%d", ch );

will display the value.

[Majoni]

Thanks,
I just checked it out it is Control+d in Linux

[Salem]

> char ch = getchar();
It should be
int ch = getchar();

char holds all possible chars. To hold all possible chars and EOF, you need a bigger data type, thus int.

Nor is the returned value guaranteed to be -1, which is why there is a constant EOF declared for this purpose.

Eg.

int ch;
while ( (ch=getchar()) != EOF ) {
  /* do stuff */
}

[dwks]

Also see this FAQ: http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1048865140&id=1043284351

[gourav1]

> char ch = getchar(); It should be int ch = getchar();

char holds all possible chars. To hold all possible chars and EOF, you need a bigger data type, thus int.

Nor is the returned value guaranteed to be -1, which is why there is a constant EOF declared for this purpose.

Eg.

int ch;
while ( (ch=getchar()) != EOF ) {
  /* do stuff */
}

good answer!! this is the solution