Why doesn't this code exit?

Question

Possible Duplicate:
EndOfFile in C - EOF

I was trying examples from K&R. I am not able to understand why this code does not exit unless ctrl+c is pressed.

int main ( )
{
    int c; 
    c = getchar(); 
    while(c!=EOF)
        {
            putchar(c);   
            c=getchar();
        }
}

Any help is appreciated. Thanks!

EDIT: Using Windows (Visual Studio 2010)

on which system are you trying this ? Windows ? Unix ? Linux ? How do you input EOF ? (usually Ctrl+D on linux boxes) — BigMike, Sep 17 '12 at 12:05

score 8 · Answer 1 · answered Sep 17 '12 at 12:07

8

In Windows, you generate end of file from the standard input stream by pressing Ctrl+Z. Depending on the buffering behavior, you might also need to press Return.

answered Sep 17 '12 at 12:07

unwind

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+1 concise, neat and correct. – BigMike Sep 17 '12 at 12:07
@BigMike Thanks, not correct enough to be accepted though, failed to read the original poster's mind. :) – unwind Sep 17 '12 at 12:35
OP asked how to trap EOF, not \n, thus this is the correct answer IMHO. If that program is used in a pipe, changing the test on EOF to a test on \n will simply break it. – BigMike Sep 17 '12 at 14:34

score 5 · Accepted Answer · answered Sep 17 '12 at 12:06

5

EOF is End of File. If you read from 'keyboard', you should compare to End of Line symbol which is equal to press Return

int main ( )
{
    int c; 
    c = getchar(); 
    while(c!= '\n')
    {
        putchar(c);   
        c=getchar();
    }
}

answered Sep 17 '12 at 12:06

Blood

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I think this is easier for me to use in code. Thanks! – Shash Sep 17 '12 at 12:13

Anshul garg · Answer 3 · 2012-09-17T12:22:12.247

-1

On Windows machine ctrl+c acts as delimiter of character scanning same as EOF 
on this loop gets broken otherwise it will keep looking for characters

edited Sep 17 '12 at 12:22

answered Sep 17 '12 at 12:14

Anshul garg

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sorry , ctrl+c should be there – Anshul garg Sep 17 '12 at 12:22

Why doesn't this code exit?

3 Answers3