Arrays

Find the max element in an array

import java.util.Scanner;

public class FindMaxInArray {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of elements in the array: ");
        int n = scanner.nextInt();

        int[] numbers = new int[n];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < n; i++) {
            numbers[i] = scanner.nextInt();
        }
        scanner.close();

        int max = numbers[0];

        for (int i = 1; i < numbers.length; i++) {
            if (numbers[i] > max) {
                max = numbers[i];
            }
        }

        System.out.println("Maximum number in the array: " + max);
    }
}

************************************************************
Reversing an Array

import java.util.Scanner;

public class ReverseArray {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of elements in the array: ");
        int n = scanner.nextInt();

        int[] numbers = new int[n];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < n; i++) {
            numbers[i] = scanner.nextInt();
        }
        scanner.close();

        int[] reversed = new int[numbers.length];

        for (int i = 0; i < numbers.length; i++) {
            reversed[i] = numbers[numbers.length - 1 - i];
        }

        System.out.print("Original array: ");
        for (int num : numbers) {
            System.out.print(num + " ");
        }

        System.out.println("\nReversed array: ");
        for (int num : reversed) {
            System.out.print(num + " ");
        }
    }
}

***************************************************
Sorting The array (using bubble sort)

import java.util.Scanner;

public class BubbleSort {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of elements in the array: ");
        int n = scanner.nextInt();

        int[] numbers = new int[n];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < n; i++) {
            numbers[i] = scanner.nextInt();
        }
        scanner.close();

        for (int i = 0; i < numbers.length - 1; i++) {
            for (int j = 0; j < numbers.length - i - 1; j++) {
                if (numbers[j] > numbers[j + 1]) {
                    // Swap numbers[j] and numbers[j + 1]
                    int temp = numbers[j];
                    numbers[j] = numbers[j + 1];
                    numbers[j + 1] = temp;
                }
            }
        }

        System.out.println("Sorted array: ");
        for (int num : numbers) {
            System.out.print(num + " ");
        }
    }
}

*****************************************************
Sum and Average of Elements in the array

import java.util.Scanner;

public class ArraySumAverage {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of elements in the array: ");
        int n = scanner.nextInt();

        int[] numbers = new int[n];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < n; i++) {
            numbers[i] = scanner.nextInt();
        }
        scanner.close();

        int sum = 0;

        for (int num : numbers) {
            sum += num;
        }

        double average = (double) sum / numbers.length;

        System.out.println("Sum of elements: " + sum);
        System.out.println("Average of elements: " + average);
    }
}

*************************************************
Searching for an element in the array ( Linear Search)

import java.util.Scanner;

public class ArraySearch {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of elements in the array: ");
        int n = scanner.nextInt();

        int[] numbers = new int[n];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < n; i++) {
            numbers[i] = scanner.nextInt();
        }
       
        System.out.print("Enter the number to search for: ");
        int target = scanner.nextInt();
        boolean found = false;

        for (int i=0;i<n;i++) {
            if (numbers[i] == target) {
                found = true;
                break;
            }
        }

        if (found) {
            System.out.println("Element " + target + " found at pos"+ i + "in the array.");
        } else {
            System.out.println("Element " + target + " not found in the array.");
        }
    }
}

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