Why std::cout instead of simply cout?

Question

I get these error messages for all cout and endl:

main.cc:17:5: error: ‘cout’ was not declared in this scope
main.cc:17:5: note: sugges         


        

Answer 1

If you are working in ROOT, you do not even have to write #include and using namespace std; simply start from int filename().

This will solve the issue.