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#include <iostream>

 * Just another way to do it.
int main()
        // Say it now.
        std::cout << "Greetings, local planet!" 
                  << std::endl;

        return 0;

This just a couple of different things. In particular, instead of saying using namespace std;, I have used the std:: qualifier on the the names from the libraries. This is essentially the full name: std::cout is cout of the family std, which is the standard C++ library.

I've also put the print across two lines. You probably already figured out that that would work.

The other thing is the return statement from main. In C++, main returns an integer, so it is most correct to have a return statement at the end. There is a long story here which I will avoid right now. For the present:

So usually folks just leave it out.