"Hello, world!" program using a class for printing
In addition to the other comments, I would also use a different naming convention for types and objects.

For example, this looks unconventional.

Print Obj;
Obj.print_();


I prefer:

Print obj;
obj.print();


It's just a convention but being able to easily spot names that denote types helps if you start to use more complex expressions. For example:

Print().print();


Personally, I would also avoid system("pause"). You need to #include either &lt;stdlib.h&gt; or &lt;cstdlib&gt; to use it. Although the system call itself is standard C++ (from the standard C library), what you pass to it is system dependent.

In general I don't believe you should make your programs stop artificially. If they are designed to run in a terminal then the terminal user will be able to see the output even after the program exits.