filestream to read and write integer numbers

[jianma]

Hi,

I wrote a small program, which uses filestream to read and write integer numbers. The segment of code is as following:

int i, j;
while (!from.eof()) { // from is the input file
from >> i >> j;
std::cout << i <<j;
}

The input file includes int numbers 1 2 3 4. I expected that the output is 1 2 3 4. But it turns out to be 1 2 3 4 3 4.
I can't figure out why it produces wrong result. Can someone give some ideas?

Thanks!

[Philip Nicoletti]

Because eof() does not become true until you actually try reading past
the EOF (not after the last read).

Normally, you do not even check for eof() ...

while (from >> i >> j)
{
   std::cout << i <<j;
}

[jianma]

Hi Philip,

It works. Thanks!

Jianhttp://www.codeguru.com/forum/newreply.php?do=newreply&noquote=1&p=2020317