People starting to learn C++ might suffer if they aren't familiar with cin >> and getline() and what happens if you use both of them together. Using cin leaves an end of line character which is then read by your getline(); It is best not to mix different types of input.

The solution one could use to overcome this problem is to use a different input method. On the other hand, it is always nice to get familiar with problems one might come across while coding, so take a look. It is possible to overcome this problem while keeping all of your code and just adding a single line.

Here is an excerpt from the input code:

cin >> doubleNumber;
cin.ignore();  //ignores an end of line character 
getline(cin, stringName);

This will read you string correctly, it will also read the whole line. It will just ignore a character and continue from that.

I could be wrong, I'm still a complete novice myself but this is the way I understand it. Cheers.