[c-prog] File open problem

[Jimmy Johnson]

Using visual studio 2008 express...

I can not open a file; f.is_open() is false.

ifstream f;
int num_patches;

f.open ("teapot.txt");
if (f.is_open()) {
        while (! (f.eof())) {
                f >> num_patches;
...

So where do I put the "teapot.txt" file?  I have tried several directories.

Perhaps there's another problem?  I'm new to c.

thanks,

jjj