Thread: coding practices

Hi, I'm trying to migrate to C++ from C (which I had a basic knowledge of). I'm just wondering, what should I use:

Code:

using namespace std;
char x[50];
cout << "Hello\n";
cin >> x;

as an example, or:

Code:

std::cout << "hello\n";
std::string x;
std::cin >> x;

or something like that?