C++ :: Calling A String In One Function Into A New Function

How would I call a string that sits within a switch loop in the main function, into a separate function?

Like this:

void statistics() {
cout << "Here are the statistics for your entry: " << endl;
cout << "
The size of your entry is " << s.length() << " characters." << endl;
}

I am calling string s from this:

switch (toupper(myChoice)) {
case 'A': cin.ignore();
cout <<"
Please enter your text: ";
getline(cin, s);

[Code] ....