>> I guess this would be helpful
No, not a bit. Your code is wrong.

>> for (n=0;inp[n];n++)
Assuming that n was defined somewhere, the test for imp[n] against 0 is dngerous because imp is...

Koenig Lookup

There are three ways to use a name nested in a namespace. Making the namespace open to the current scope with a using directive:

using namespace std;

cout << "Hello world!" <<...