int main()
{
    int a, b, c, d;

    cout << "Enter the value of coefficient a: ";
    cin >> a;

    if (a == 0)
    {
        cout << "Error! The value of a is 0!\n";
        return 0;
    }
    else
    {
        cout << "Enter the value of coefficient b: ";
        cin >> b;

        cout << "Enter the value of coefficient c: ";
        cin >> c;
    }

    d = b * b - 4 * a * c;

    if (d < 0)
    {
        cout << "No real roots!\n";
        return 0;
    }
    else
    {
        cout <<"Real root 1: " <<(-b + d) / (2 * a) << endl;
        cout <<"Real root 2: " <<(-b - d) / (2 * a) << endl;
    }
    return 0;
}