do,while problems

here is my code:

Code:

int menu(void)
{
    int answer = 0;
    
    do {
        cout << "----Menu----" << endl
             << "1 Add two fractions" << endl
             << "2 Multiply two fractions" << endl
             << "3 Exit the program" << endl
             << "Please select an option (1, 2, or 3): ";
        cin >> answer;
    } while (answer != 1);
    
return answer;
}

for some reason when i change,

Code:

    } while (answer != 1);

// to this

    } while (answer != 1 || 2);

// or this

    } while (answer != '1' || '2');

i can not seem to get the loop to stop once the correct answer is input.

I have looked at both the do, while and || operator and cant seem to find where the problem is because it causes no errors.
Thanks to anyone that can help.

You can't say (answer == a || b).
You have to do each one on its own:

Code:

while ( (answer != 1) && (answer != 2) )

When the answer is either 1 or 2, the while loop will end.

Thank you.