Program ends early after I set an integer's value

Question

string command;
int ZaneNightTrain;

NightTrain:

cin.ignore();
getline(cin, command);
transform(command.begin(), command.end(),command.begin(), ::toupper);
if (command == "TALK TO ZANE")
{

    if (ZaneNightTrain == 0)
    {
        cout << "\nZane: Blah Blah Blah 1\n\n";
        ZaneNightTrain++;

        goto NightTrain;
    }
}
else if (ZaneNightTrain == 1)
{
    cout << "\nZane: Blah blah blah 2\n" << endl;
    ZaneNightTrain++;
    goto NightTrain;
}
else if (ZaneNightTrain == 2)
{
    cout << "\nBlah blah blah 3\n" << endl;

    ZaneNightTrain = 0;

    goto NightTrain;
}

return 0;
}

I have no idea why ZaneNightTrain = 0; ends the program automatically. I could set the number to 2 and it does what it's supposed to be doing. I tried setting it up so the first thing he says is a 1 instead of a 0 and it starts ending the program as well. I had another version of this code where you enter a number instead of a string to talk and it has no problems.

Answer 1

You're not initializing the value of ZaneNightTrain

int ZaneNightTrain = 0;

This previous question may help you more fully understand what is happening. Why do I see strange values when I print uninitialized variables?

The TLDR is that the value of a declared variable is not guaranteed and you must set it to a default value if you're going to check that as the first operation in your program.