Different files

[Saamwiil]

How do you get a file (get("text.txt")), but the file isn't defined in the programme but rather by user input. Example:
get(x) //doesn't work for me.x is a string.

[Moschops]

You can fetch input from a user to populate a string.

string x;
cin >> x;

What is get supposed to do? It's not a standard C++ function.