Apparantly you've not gotten far in your C++ studies

Your choices are either to:
1) add on to your cout statement to say cout << "this is a test << endl;
The endl is endline, which starts a new line.
2) add on to your "this is a test" to say "this is a test\n"
The \n is an escape character (you'll learn about those) that makes a new line. Both do the same and work in different situations, it's really all personal preference.