public class ArraySum {
    public static void main(String[] args) {
        int[] numbers = {5, 2, 8, 1, 9};
        int sum = 0;

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

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

 
import java.util.Arrays;

public class ArraySorting {
    public static void main(String[] args) {
        
        int[] numbers = {5, 2, 8, 1, 9};
        System.out.println("Original numeric array: " + Arrays.toString(numbers));

        Arrays.sort(numbers);
        System.out.println("Sorted numeric array: " + Arrays.toString(numbers));







       
        String[] names = {"Alice", "Bob", "Charlie", "David", "Eve"};
        System.out.println("Original string array: " + Arrays.toString(names));

        Arrays.sort(names);
        System.out.println("Sorted string array: " + Arrays.toString(names));
    }
}

 
public class ArrayAverage {
    public static void main(String[] args) {
        int[] numbers = { 2, 4, 6, 8, 10 }; // Input array

        double average = calculateAverage(numbers);

        System.out.println("The average of the array elements is: " + average);
    }

    // Function to calculate the average of array elements
    public static double calculateAverage(int[] arr) {
        int sum = 0;
        for (int i = 0; i < arr.length; i++) {
            sum += arr[i];
        }
        double average = (double) sum / arr.length;
        return average;
    }
}

 
import java.util.Scanner;

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

        System.out.print("Enter the first string: ");
        String firstString = scanner.nextLine();

        System.out.print("Enter the second string: ");
        String secondString = scanner.nextLine();
'l
       
        if (firstString.equals(secondString)) {
            System.out.println("The strings are equal.");
        } else {
            System.out.println("The strings are not equal.");
        }

        System.out.println("Length of the first string: " + firstString.length());
        System.out.println("Length of the second string: " + secondString.length());
    }
}

 
public class StringPermutations {
    public static void main(String[] args) {
        String input = "abc";
        System.out.println("Permutations of the string: " + input);
        computePermutations("", input);
    }

    private static void computePermutations(String prefix, String remaining) {
        int length = remaining.length();

        if (length == 0) {
            System.out.println(prefix);
            return;
        }

        for (int i = 0; i < length; i++) 
        {
            char chosenChar = remaining.charAt(i);

            String newPrefix = prefix + chosenChar;
            String newRemaining = remaining.substring(0, i) + remaining.substring(i + 1);
            computePermutations(newPrefix, newRemaining);
        }
    }
}

 
public class VowelCounter {
    public static int countVowels(String str) {
        int count = 0;
        String vowels = "aeiouAEIOU";

        for (int i = 0; i < str.length(); i++) 
           {
            char c = str.charAt(i);
            if (vowels.indexOf(c) != -1) {
                count++;
            }
        }

        return count;
    }

    public static void main(String[] args) {
        String input = "Hello, World!";
        int vowelCount = countVowels(input);

        System.out.println("Number of vowels in the string:
                            " + vowelCount);
    }
}