bool RequestAnswer (const Fraction& result);

int main()
{
    srand(time(0));       

    const int NumberOfTest = 5;

    char op;
    int score = 0, chance = 3;

    cout << "\nChoose your arithmetic operator ( *, /, +, or - )\n"
            << "Your choice: ";
    cin  >> op;
    cin.ignore(1, '\n');

    if (op == '+' || op == '-' || op == '*' || op == '/')
    {

        Fraction first_input;
        Fraction second_input;
        Fraction result;

        for (int i = 0; i < NumberOfTest; i++)
        {
            int first_numerator = (rand() % 5) + 1;
            int second_numerator = (rand() % 5) + 1;

            first_input.set(first_numerator, 10);
            second_input.set(second_numerator, 10);

            cout << "\nQuestion number " << (i + 1) << ":\n";

            switch(op)
            {
                case '+':
                    cout << first_numerator << "/" << "10" << " + "
                            << second_numerator << "/" << "10";
                    result = first_input + second_input;
                    break;
                case '-':
                        cout << first_numerator << "/" << "10" << " - "
                               << second_numerator << "/" << "10";
                        result = first_input - second_input;
                        break;
                case '*':
                        cout << first_numerator << "/" << "10" << " * "
                               << second_numerator << "/" << "10";
                        result = first_input * second_input;
                        break;
                case '/':
                        cout << first_numerator << "/" << "10" << " / "
                                << second_numerator << "/" << "10";
                        result = first_input / second_input;
                        break;
                default:
                        break;
            }

            cout << "\n\nWhat is your answer?\n";

            if (RequestAnswer(result) == true)
            {
                cout << "\nYour answer is correct.\n\n";
                score++;
            }
        }

        cout << "\n\nYour total score is " << score << " out of 5!\n\n";
    }
    else
    {
        cout << "Operator is not define. Choose your operator again (*, /, +, or -):\n";
        cin  >> op;
        cin.ignore(1, '\n');
    }

    system("pause");
    return 0;
}

bool RequestAnswer (const Fraction& result)
{
    int NumberOfAttempt = 3;
    Fraction answer;

    for (int i = 0; i < NumberOfAttempt; i++)
    {
        if (answer.GetInput() == true)
        {
            if (result == answer)
            {
                return true;
            }
            else
            {
                NumberOfAttempt--;
                if (NumberOfAttempt != 1)
                {    cout << "\nYour answer is wrong.\n"
                              << "You have " << NumberOfAttempt
                              << " more chances to answer this problem. Try again!\n"
                              << "What is your answer?\n";
                    answer.GetInput();
                }
                else
                {
                    cout << "\nYour answer is still wrong. The correct answer is ";
                    result.display();
                    cout << "\n";
                }
            }
        }
        else
        {
            cout << "\nBad input. Try again!\n" << "Your answer is: ";
            i--;
        }
    }

    return false;
}