File I/O Question

[solartimba]

I am having a file I/O problem that I can't seem to solve. The
following code is used to read in a file and write the same data:

CODE
while(infile)
{
infile >> num1 >> num2;
cout << num1 << " " << num2 << endl;
outfile << num1 << " " << num2 << endl;
}

INFILE
1 11
2 22
3 33
4 44
5 55
6 66
7 77

OUTFILE
1 11
2 22
3 33
4 44
5 55
6 66
7 77
77

Why is this repeating half of the final line of data?

[Ron Natalie]

"solartimba" <ka*****@hotmail.com> wrote in message news:1a**************************@posting.google.c om...

I am having a file I/O problem that I can't seem to solve. The
following code is used to read in a file and write the same data:

CODE
while(infile)

Why is this repeating half of the final line of data?

Because the stream doesn't enter an error state until AFTER
you do an input that fails.

Try this:
while(infile >> num1 >> num2) {
cout << ...
outfile << ...
}

[user]

solartimba wrote:

I am having a file I/O problem that I can't seem to solve. The
following code is used to read in a file and write the same data:

CODE
while(infile)
You should write while (infile >> num1 >> num2) {
...
}

{
infile >> num1 >> num2;
cout << num1 << " " << num2 << endl;
outfile << num1 << " " << num2 << endl;
}

INFILE
1 11
2 22
3 33
4 44
5 55
6 66
7 77

OUTFILE
1 11
2 22
3 33
4 44
5 55
6 66
7 77
77

Why is this repeating half of the final line of data?