so if there is NOTHING written, End of File, (EOF) is not returned automatically?
No, it's not. It should be sent by the user.
So is it that only the user can invoke EOF
in stdin
by pressing Ctrl+Z?
Yes, you can set the EOF
indicator for stdin
with a special key combination you can input in the console, for linux console that is Ctrl+D and for windows it's Ctrl+Z.
If so then what are some of the uses of EOF
in stdin
? I guess it tells the program to continue reading until the user user invokes end of file? is this it?
The use of it depends on whether you instruct the user to input the EOF
explicitly or not, for example, I think python
console will tell you something like Press Ctrl+D or type quit() to exit
.
And EOF
is not necessarily -1
it's a macro and you should always use it to test for the EOF
indicator. And more importantly EOF
is not a character, it's a special value that indicates that the End Of File indicator is set.
Also, getchar()
is equivalent to fgetc(stdin)
.
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