How to display text from a C++ file on button click?

Question

C++ / C#

Hello!
I started learning how to work with files in C++ and ran into a problem with text output.
My code:

ifstream fin;
    fin.open("myFile.txt");

    string arr_char;

    for (int i = 0; fin.eof() == false ; i++)
    {
        fin >> arr_char;
        cout << arr_char << endl;
    }

Question: how to display one word from a file by pressing the enter button?