Untitled

public class Course{
    public String cName;
    public String code;
    public int credit;

    public void createCourse(String a, String b, int c) {
        cName = a;
        code = b;
        credit = c;
    }

    public void displayCourse() {
        System.out.println("Course Name: " + cName + "\n" +
                "Course Code: " + code + "\n" +
                "Course Credit: " + credit);
    }

    public void updateCourse(String a, String b, int c) {
            cName = a;
            code = b;
            credit = c;

    }



}







public class Dog {
    String name = "A dog";
    String color;

    public void changeName(String a) {
        name = a;
    }

    public String bark() {
        if (color == null || name.equals("White dog"))
        {return name + " is barking";}
        else {
            return name + " the " + color + " dog is barking";
        }

    }

    public void changeColor(String a) {
        color = a;
        if(name.equals("A dog")) {
            name = a + " dog";
            System.out.println("This dog is " + a);
        }
        else {
            System.out.println(name + " is " + a);
        }
    }
}








public class Employee {
    String name;
    double salary = 30000.0;
    String designation = "junior";
    double tax = 0.0;

    public void newEmployee(String a) {
        name = a;
    }

    public void displayInfo() {
        System.out.println("Employee Name: " + name + "\n" +
                "Employee Salary: " + salary + "Tk" + "\n" +
                "Employee Designation: " + designation);

    }

    public void calculateTax() {
        if (salary > 50000.0) {
            tax = salary * 0.30;
            System.out.println(name + " Tax Amount: " + tax + " Tk");
        } else if (salary > 30000) {
            tax = salary * 0.10;
            System.out.println(name + " Tax Amount: " + tax + " Tk");
        }
        else {
            System.out.println("No need to pay tax");
        }
    }

    public void promoteEmployee(String a) {
        if(a.equals("senior")) {
            salary+= 25000;
            designation = a;
            System.out.println(name + " has been promoted to " + designation);
            System.out.println("New Salary: " + salary);
        }
        else if(a.equals("lead")) {
            salary += 50000;
            designation = a;
            System.out.println(name + " has been promoted to " + designation);
            System.out.println("New Salary: " + salary);
        } else if(a.equals("manager")) {
            salary += 75000;
            designation = a;
            System.out.println(name + " has been promoted to " + designation);
            System.out.println("New Salary: " + salary);
        }
    }


}







public class Employee {
    String name;
    double salary = 30000.0;
    String designation = "junior";
    double tax = 0.0;

    public void newEmployee(String a) {
        name = a;
    }

    public void displayInfo() {
        System.out.println("Employee Name: " + name + "\n" +
                "Employee Salary: " + salary + "Tk" + "\n" +
                "Employee Designation: " + designation);

    }

    public void calculateTax() {
        if (salary > 50000.0) {
            tax = salary * 0.30;
            System.out.println(name + " Tax Amount: " + tax + " Tk");
        } else if (salary > 30000) {
            tax = salary * 0.10;
            System.out.println(name + " Tax Amount: " + tax + " Tk");
        }
        else {
            System.out.println("No need to pay tax");
        }
    }

    public void promoteEmployee(String a) {
        if(a.equals("senior")) {
            salary+= 25000;
            designation = a;
            System.out.println(name + " has been promoted to " + designation);
            System.out.println("New Salary: " + salary);
        }
        else if(a.equals("lead")) {
            salary += 50000;
            designation = a;
            System.out.println(name + " has been promoted to " + designation);
            System.out.println("New Salary: " + salary);
        } else if(a.equals("manager")) {
            salary += 75000;
            designation = a;
            System.out.println(name + " has been promoted to " + designation);
            System.out.println("New Salary: " + salary);
        }
    }


}







public class MagicItem {
    String name;
    int level;
    String[] magicitem = new String[3];
    int count;

    public void newCharacter(String a) {
        name = a;
    }

    public void displayInfo() {
        System.out.println("Character Name: " + name + "\n" +
                "Energy Level: " + level + "\n" +
                "Item 1: " + magicitem[0] +  "\n" +
                "Item 2: " + magicitem[1] + "\n" +
                "Item 3: " + magicitem[2]);
    }

    public void findItem(String a) {
        if(count < magicitem.length) {
            magicitem[count++] = a;
            System.out.println(name + " found a " + a);
        } else {
            System.out.println("All item slots occupied");
        }

    }


    public void useItem(String a) {
        boolean found = false;
        for (int i = 0; i < magicitem.length; i++) {
            if (magicitem[i] != null && magicitem[i].equals(a)) {
                found = true;
                if (a.equals("Potion")) {
                    level += 50;

                } else if (a.equals("Elixir")) {
                    level += 100;

                } else if (a.equals("Amulet")) {
                    level += 200;

                }
                System.out.println(name + " used a " + a);
                System.out.println("Energy Level after using item: " + level);
                magicitem[i] = null;
                break;
            }
        }
        if (!found) {
            System.out.println("Item not in inventory.");
        } else {
            count = 0;
        }
    }


}








public class Cart {
    int cartNum;
    int count;
    String[] item = new String[3];
    double[] price = new double[3];
    double sum;
    double discount;
    double subMoney;

    public void create_cart(int a) {
        cartNum = a;
    }

    public void addItem(String a, double b) {
        if (count < 3) {
            item[count] = a;
            price[count] = b;
            count++;
            System.out.println(a + " added to cart " + cartNum);
            System.out.println("You have " + count + " item(s) in your cart now.");
        } else {
            System.out.println("You already have 3 item(s) in your cart.");
        }



    }

    public void cartDetails () {
        System.out.println("Your cart " + "(c" + cartNum + "):");
        for (int i = 0; i < 3; i++) {
            if (item[i] != null) {System.out.println(item[i] + " - " + price[i]);}

            sum += price[i];


        }  System.out.println("Discount Applied: " + discount + "%");
        System.out.println("Total price: " + subMoney);  }


    public void giveDiscount(int a) {
        discount = a;
        subMoney = sum - (sum * a/100.0);
    }



}







public class Reader {
    String name;
    int capacity;
    String[] books;
    int count;

    public void createReader(String a, int b) {
        name = a;
        capacity = b;
        books = new String[capacity];
    }

    public void readerInfo() {
        System.out.println("Name: " + name);
        System.out.println("Capacity: " + capacity);
        System.out.println("Books: ");
        if (count > 0) {
            for (int i = 0; i < books.length; i++) {
                if(books[i] != null) {
                System.out.println("Book " + (i+1) + ": " + books[i]);}
            }

        } else {
            System.out.println("No books added yet");
        }


    }


    public void addBook (String a) {
        if (count < books.length) {
            books[count++] = a;
        } else {
            System.out.println("No more space for new book");
        }
    }

    public void increaseCapacity(int a) {
        String[] newBooks = new String[a];
        for (int i = 0; i < count; i++) {
            newBooks[i] = books[i];
        }
        books = newBooks;
        capacity = a;
        System.out.println(name + "'s capacity increased to " + capacity);
    }
}







public class UberApp {
    String name;
    String phone;
    int age;
    int rides = 3;
    double fare;
    double newfare;
    String[] visited = new String[3];
    int count = 0;
    public void createProfile(String a, int b, String c) {
        name = a;
        age = b;
        phone = c;
    }

    public void showProfile() {
        System.out.println("Hello! This is your Profile:");
        System.out.println("Name: " + name + "\n" +
                "Age: " + age + "\n" +
                "Phone number: " + phone);

    }

    public int remainingRides() {
        return rides;
    }

    public void bookRide(String a, double b) {
        if (rides > 0) {
            visited[count++] = a;
            fare = 30 * b;
            System.out.println(name + " has booked a ride!");
            System.out.println("Destination: " + a);
            System.out.println("Fare: " + fare + " Taka");
            rides--;
        } else {
            System.out.println(name + " ,please update your plan to premium " +
                    "or wait till next month!");
        }

    }

    public void changeLocation(String a, double b) {
        visited[--count] = a;
        fare = 30 * b;
        newfare = fare + (0.2 * fare);
        System.out.println(name + " has changed the destination of the current ride" +
                " to " + a);
        System.out.println("New fare after adding 20% charge");
        System.out.println("Fare: " + newfare + " Taka");
    }

    public void ridingHistory() {
        if (rides == 3) {
            System.out.println(name + " , you haven't visited anywhere this month");
        }

        else {
            System.out.print(name + " , you have visited ");
            for(int i = 0; i < visited.length; i++) {
                if(visited[i] != null) {
                    System.out.print(visited[i] + ", ");
                }
            }
            System.out.println(" this month.");
        }
    }

    public void resetMonth() {
        rides = 3;
        count = 0;
        for (int i = 0; i < visited.length; i++) {
            visited[i] = null;
        }
    }




}