why the output "Error opening file" does not display if i comment the commented lines in this code?

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in this code when i comment these two lines the output "Error opening file" does not display to the screen but when i do not comment these two below commented lines the output "Error opening file" is displayed by the program , why it is?

C++

int main()
{
    fstream f;
    //f.open("D:\\Test",ios::in);
    //f.close();
    
    if(!f)
          cout<<"Error opening file";
          
    getch();
    return 0;
}

Posted 16-Mar-12 8:03am

Ashutosh_g

Updated 16-Mar-12 8:20am

Nelek

v2

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enhzflep 16-Mar-12 14:11pm

Well, do you have a file named "Test", in the root directory of D drive?

Ashutosh_g 16-Mar-12 14:23pm

yes

Ashutosh_g 16-Mar-12 14:27pm

yes the file test is in directory D

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Nelek · Answer 1 · 2012-03-16T08:25:00

I recommend you to have a look here[^]

You are opening and closing the file. By closing you disassociate the file of the fstream.

quote from the site:
Once closed, the same file stream object may be used to open another file
[/quote]

On the other hand... open file does not necessary mean create file.

nv3 · Answer 2 · 2012-03-16T08:38:00

Looks like the open operation fails. Hence, the failbit flag gets set in the fstream object and that is what's tested in the !f expression.

When you comment the two lines out you have a brand new fstream object which has the failbit not set -- no error has occurred yet.

So my guess would be that you don't have a file named "D:\\Test". Perhaps you have a file "Test.<something>" with another file type in the root directory of drive D:?

why the output "Error opening file" does not display if i comment the commented lines in this code?

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