package asd;

import java.util.Scanner;

public class LabExer5B {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Initiating 10 questions in array
        String[] questions = {
            "Question 1: What does HTML stand for?\nA. Hyper Text Markup Language\nB. High Tech Markup Language\nC. Hyperlinks and Text Markup Language",
            "Question 2: Which programming language is commonly used for developing mobile applications?\nA. Java\nB. C++\nC. Swift",
            "Question 3: What does CSS stand for?\nA. Cascading Style Sheets\nB. Computer Style Sheets\nC. Creative Style Sheets",
            "Question 4: Which data structure uses LIFO (Last In, First Out) principle?\nA. Queue\nB. Stack\nC. Linked List",
            "Question 5: Which of the following is not a programming paradigm?\nA. Object-Oriented Programming\nB. Functional Programming\nC. Scripting Programming",
            "Question 6: What does IDE stand for?\nA. Integrated Development Environment\nB. Interactive Design Environment\nC. Intelligent Development Environment",
            "Question 7: Which of the following is not a primitive data type in Java?\nA. String\nB. int\nC. boolean",
            "Question 8: What is the purpose of the keyword \"break\" in programming?\nA. To exit a loop or switch statement\nB. To pause the program execution temporarily\nC. To skip to the next iteration of a loop",
            "Question 9: Which of the following sorting algorithms has the worst time complexity?\nA. Merge Sort\nB. Quick Sort\nC. Bubble Sort",
            "Question 10: What is the main advantage of using version control systems like Git?\nA. Automatic bug fixing\nB. Collaboration with multiple developers\nC. Improved program performance",
        };

        // Initiating the correct answers on all 10 questions
        String[] answers = {"A", "C", "A", "B", "C", "A", "A", "A", "C", "B"};

        int score = 0;

        // Loop all questions
        for (int i = 0; i < questions.length; i++) {
            // Printing the questions
            System.out.println(questions[i]);
            System.out.print("Your answer: ");
            String userInput = scanner.nextLine().trim().toUpperCase(); // Taking user on each questions

            try {
                if (userInput.isEmpty()) {
                    // Throw error when the answer is empty or whitespace
                    throw new IllegalArgumentException("Blank answer. Please try again.");
                }
                if (userInput.matches("[A-Za-z]") && !userInput.matches("[A-C]")) {
                    // Throw error when the answer is invalid letter
                    throw new IllegalArgumentException("Invalid letter. Please enter A, B, or C.");
                }
                if (!userInput.matches("[A-C]")) {
                    // Throw error when the answer is not an alphabet
                    throw new IllegalArgumentException("Invalid input. Please enter A, B, or C.");
                }
                // Check if the answer is correct
                if (userInput.equals(answers[i])) {
                    System.out.println("Correct answer.");
                    score++;
                } else {
                    System.out.println("Incorrect answer.");
                }
            } catch (IllegalArgumentException e) {
                // Printing the error message
                System.out.println("\n"+e.getMessage());
                System.out.println("You can answer again.");
                i--; // Decrease I to repeat the question
            }

            System.out.println();
        }

        System.out.println("Your score: " + score + "/" + questions.length);
    }
}