LAB 8 Classwork

//classwork one

import java.util.Scanner;

public class ClassworkOne {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("N = ");
        int N = sc.nextInt();

        int[] array = new int[N];



        for (int i = 0; i < N; i++) {
            System.out.print("Enter a number: ");
            array[i] = sc.nextInt();
        }


        System.out.println("The elements of the array are: ");
        for (int i = 0; i < N; i++) {
            System.out.println(i + ": " + array[i]);
        }


        System.out.print("Enter another number: ");
        int newNum = sc.nextInt();


        int[] resizedArray = new int[N + 1];
        for (int i = 0; i < N; i++) {
            resizedArray[i] = array[i];
        }
        resizedArray[N] = newNum;


        System.out.println("After resizing the array:");
        for (int i = 0; i < resizedArray.length; i++) {
            System.out.print(resizedArray[i] + " ");
        }
    }
}


//classwork two

public class ClassworkTwo {
    public static void main(String[] args) {
        int[] array = {9, -5, 7, 9, -5, 5, 7};

        System.out.println("Before removing duplicates:");
        for (int i = 0; i < array.length; i++) {
            System.out.print(array[i] + " ");
        }

        for (int i = 0; i < array.length; i++) {
            if (array[i] != 0) {
                for (int j = i + 1; j < array.length; j++) {
                    if (array[i] == array[j]) {
                        array[j] = 0;
                    }
                }
            }
        }

        System.out.println("\nAfter replacing duplicates with 0:");
        for (int i = 0; i < array.length; i++) {
            System.out.print(array[i] + " ");
        }
        System.out.println();
    }
}


//classwork three

import java.util.Scanner;

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

        System.out.print("Enter the length of the array: ");
        int length = sc.nextInt();

        int[] array = new int[length];



        for (int i = 0; i < length; i++) {
            System.out.print("Enter a number: ");
            array[i] = sc.nextInt();
        }


        int[] reversedArrayOutOfPlace = new int[length];
        for (int i = 0; i < length; i++) {
            reversedArrayOutOfPlace[length - 1 - i] = array[i];
        }
        System.out.println("Reversed Array using a new array:");
        for (int i = 0; i < length; i++) {
            System.out.print(reversedArrayOutOfPlace[i] + " ");
        }
        System.out.println();


        for (int i = 0; i < length / 2; i++) {
            int temp = array[i];
            array[i] = array[length - 1 - i];
            array[length - 1 - i] = temp;
        }
        System.out.println("Reversed the original array:");
        for (int i = 0; i < length; i++) {
            System.out.print(array[i] + " ");
        }
        System.out.println();
    }
}