def print_results(score, num_questions, total_time):
    """Calculates and displays the final grade and feedback."""
    percentage = round((score / num_questions) * 100, 1)

    print("\n" + "=" * 40)
    print("           QUIZ RESULTS           ")
    print("=" * 40)
    print(f"Final Score : {score} out of {num_questions}")
    print(f"Accuracy    : {percentage}%")
    print(f"Time Taken  : {total_time} seconds")

    if percentage == 100:
        print("Feedback    : Perfect score! Outstanding job! 🎉")
    elif percentage >= 80:
        print("Feedback    : Great work! You know your tables well. 👍")
    elif percentage >= 50:
        print("Feedback    : Good attempt! Keep practicing. 💪")
    else:
        print("Feedback    : Don't give up! Practice makes perfect. 📚")


def start_quiz():
    """Runs the multiplication quiz loop."""
    print("=" * 40)
    print("  Welcome to the Multiplication Quiz!")
    print("=" * 40)

    min_val, max_val = select_difficulty()
    num_questions = get_positive_integer("\nHow many questions would you like? ")

    score = 0
    start_time = time.time()

    for i in range(1, num_questions + 1):
        num1 = random.randint(min_val, max_val)
        num2 = random.randint(min_val, max_val)
        correct_answer = num1 * num2

        print(f"\nQuestion {i}/{num_questions}: What is {num1} × {num2}?")
        user_answer = get_user_answer("Your answer: ")

        if user_answer == correct_answer:
            print("✨ Correct!")
            score += 1
        else:
            print(f"❌ Incorrect. The correct answer was {correct_answer}.")

    total_time = round(time.time() - start_time, 1)
    print_results(score, num_questions, total_time)