How to make user input declare the size of string array?

Question

something like

ifstream myfile ("example.txt");
        if (myfile.is_open())
        {
            while ( getline (myfile,line) )
            {
                nr++; //how many lines in a text file
            }
        }

string y[nr] = {};

only works when I specify actual number like y[10].

Answer 1

You cannot declare arrays with an unknown size unless you are using a non portable compiler extension. The standard way to accomplish this is to use a vector.

int x;
cout << "Size of your array: ";
cin >> x;
vector<string> y(x);