Question

What is the difference between endl; and \n.

Answer 1

They are two different types:
"\n" is a character constant, meanwhile "std::endl()" is a function.
Performance wise \n better. This is because std::endl() flushes the stream after adding the new-line character, it also adds a new-line character to the out-put stream.
Note: If you want to flush the stream instead of using std::endl() you can call std::cout.flush().
Here is a link:
http://stackoverflow.com/questions/213907/c-stdendl-vs-n
So in all there isn't much of a difference.

Answer 2

Also, Welcome to Openstudy.
Enjoy your stay.

Answer 3

And "std::endl()" can't be used inside quotes... so If you want a quick two line thing, you can do that inside a single thing:
cout << "Please remember that capitalization matters!\nEnter your password here: " ;