Lab 4 (Solved)

Question 1

• diamond (aka rhombus or losange)
• paralelogrammes
• dynamic connectors
• rectangles
• Yes/No arrows
• Circle
• True/False

Question 2

import java.util.Scanner;

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

        System.out.print("Enter your age: \n");
        int age = scanner.nextInt();

        System.out.println("You entered: " + age);

        final int YOUNG_AGE = 21;
        if (age < YOUNG_AGE) {
            System.out.println("It's great to be young!");
        }
    }
}

Question 2

import java.util.Scanner;

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

        System.out.print("Enter your age: \n");
        int age = scanner.nextInt();

        System.out.println("You entered: " + age);

        final int YOUNG_AGE = 21;
        if (age < YOUNG_AGE) {
            System.out.println("It's great to be young!");
        }
    }
}

Question 3

import java.util.Scanner;

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

        System.out.print("Enter your age: \n");
        int age = scanner.nextInt();

        System.out.println("You entered: " + age);

        final int YOUNG_AGE = 21;
        if (age < YOUNG_AGE) {
            System.out.println("It's great to be young!");
        } else {
            System.out.println("Age is a state of mind!");
        }
    }
}

Question 4

import java.util.Scanner;

public class PasswordChecker {
    private static final String CORRECT_PASSWORD = "C0RR3CT";

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

        System.out.print("Please enter password: \n");
        String password = scanner.nextLine();

        if (password.equals(CORRECT_PASSWORD)) {
            System.out.println("You have gained access to the system!");
        } else {
            System.out.println("Your password is incorrect!");
        }
    }
}

Question 5

import java.util.Scanner;

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

        System.out.println("Choose an option to display the corresponding piece of information:");
        System.out.println("1.Capital of Bahrain");
        System.out.println("2.Population of Bahrain");
        System.out.println("3.Climate of Bahrain");
        System.out.println("4.GDP of Bahrain");
        System.out.println("5.Size of Bahrain (square km)");

        int choice = scanner.nextInt();

        switch (choice) {
            case 1:
                System.out.println("Your choice was 1. The capital of Bahrain is Manama.");
                break;
            case 2:
                System.out.println("Your choice was 2. The population of Bahrain: 1,039,297.");
                break;
            case 3:
                System.out.println("Your choice was 3. Bahrain has two seasons: an extremely hot summer and a relatively mild winter.");
                break;
            case 4:
                System.out.println("Your choice was 4. Bahrain's GDP was 35.31 billion USD in 2017.");
                break;
            case 5:
                System.out.println("Your choice was 5. Bahrain is 765.3 square km.");
                break;
            default:
                System.out.println("You entered a wrong choice.");
        }
    }
}

Question 6

import java.util.Scanner;

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

        System.out.println("Please enter your exam mark ");
        int mark = scanner.nextInt();

        if (mark >= 85 && mark <= 100) {
            System.out.println("Your grade is A");
        } else if (mark >= 70 && mark <= 84) {
            System.out.println("Your grade is B");
        } else if (mark >= 60 && mark <= 69) {
            System.out.println("Your grade is C");
        } else if (mark >= 0 && mark <= 59) {
            System.out.println("Your grade is D");
        } else {
            System.out.println("Invalid mark entered");
        }
    }
}

Question 7

import java.util.Scanner;

public class Unit4 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String password = "C0RR3CT";
        int phoneNumber = 1234;

        System.out.print("Please enter password: \n");
        String inputPassword = scanner.nextLine();

        if (inputPassword.equals(password)) {
            System.out.print("Please enter the last 4 digits of your phone number: \n");
            int inputPhoneNumber = scanner.nextInt();

            if (inputPhoneNumber == phoneNumber) {
                System.out.println("You have gained access to the system!");
            } else {
                System.out.println("Your phone number is incorrect!");
            }
        } else {
            System.out.println("Your password is incorrect!");
        }
    }
}

Question 8

import java.util.Scanner;

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

        System.out.println("Choose an option to display the corresponding piece of information:");
        System.out.println("1.Capital of Bahrain");
        System.out.println("2.Population of Bahrain");
        System.out.println("3.Climate of Bahrain");
        System.out.println("4.GDP of Bahrain");
        System.out.println("5.Size of Bahrain (square km)");

        int choice = scanner.nextInt();

        switch (choice) {
            case 1:
                System.out.println("Your choice was 1. The capital of Bahrain is Manama.");
                break;
            case 2:
                System.out.println("Your choice was 2. The population of Bahrain: 1,039,297.");
                break;
            case 3:
                System.out.println("Your choice was 3. Bahrain has two seasons: an extremely hot summer and a relatively mild winter.");
                break;
            case 4:
                System.out.println("Your choice was 4. Bahrain's GDP was 35.31 billion USD in 2017.");
                break;
            case 5:
                System.out.println("Your choice was 5. Bahrain is 765.3 square km.");
                break;
            default:
                System.out.println("You entered a wrong choice.");
        }
    }
}