JAVA

import java.util.Scanner;

public class ReverseString {

    public static void main(String[] args) {

        // Create a Scanner object for input

        Scanner scanner = new Scanner(System.in);

        // Ask the user to enter a string

        System.out.println("Enter a string to reverse:");

        String input = scanner.nextLine();

        // Reverse the string

        String reversed = reverseString(input);

        // Print the reversed string

        System.out.println("Reversed string: " + reversed);

        // Close the scanner

        scanner.close();

    }

    // Method to reverse a string

    public static String reverseString(String str) {

        StringBuilder sb = new StringBuilder(str);

        return sb.reverse().toString();

    }

}

Example Input and Output

If the user inputs:

Enter a string to reverse:

hello

The output will be:

Reversed string: olleh

import java.util.Scanner;

public class LargestElement {

    public static void main(String[] args) {

        // Create a Scanner object for input

        Scanner scanner = new Scanner(System.in);

        // Ask the user for the number of elements in the array

        System.out.println("Enter the number of elements in the array:");

        int n = scanner.nextInt();

        // Create an array to hold the elements

        int[] array = new int[n];

        // Ask the user to input the elements of the array

        System.out.println("Enter the elements of the array:");

        for (int i = 0; i < n; i++) {

            array[i] = scanner.nextInt();

        }

        // Find the largest element in the array

        int largest = findLargest(array);

        // Print the largest element

        System.out.println("The largest element in the array is: " + largest);

        // Close the scanner

        scanner.close();

    }

    // Method to find the largest element in the array

    public static int findLargest(int[] array) {

        int max = array[0];  // Assume the first element is the largest

        for (int i = 1; i < array.length; i++) {

            if (array[i] > max) {

                max = array[i];  // Update max if current element is greater

            }

        }

        return max;

    }

}

Explanation:

1. Import the Scanner class:

   • We import the Scanner class from java.util to take input from the user.

2. Define the class LargestElement:

   • The main class is named LargestElement and contains the logic for finding the largest element in an array.

3. Define the main method:

   • This is the entry point for the program. It reads input from the user and calls the helper method findLargest to find the largest element.

4. Create a Scanner object and get array size:

Scanner scanner = new Scanner(System.in);

System.out.println("Enter the number of elements in the array:");

int n = scanner.nextInt();

• We create a Scanner object to accept user input. The variable n stores the number of elements in the array.

Create the array and populate it:

int[] array = new int[n];

System.out.println("Enter the elements of the array:");

for (int i = 0; i < n; i++) {

    array[i] = scanner.nextInt();

}

int[] array = new int[n];

System.out.println("Enter the elements of the array:");

for (int i = 0; i < n; i++) {

    array[i] = scanner.nextInt();

}

int[] array = new int[n];

System.out.println("Enter the elements of the array:");

for (int i = 0; i < n; i++) {

    array[i] = scanner.nextInt();

}

• We declare an integer array array with n elements. The for loop is used to populate the array by reading each element from the user.

Call the findLargest method:

int largest = findLargest(array);

• The findLargest method is called to find the largest element in the array. The result is stored in the variable largest.

Define the findLargest method:

public static int findLargest(int[] array) {

    int max = array[0]; // Assume the first element is the largest

    for (int i = 1; i < array.length; i++) {

        if (array[i] > max) {

            max = array[i]; // Update max if current element is greater

        }

    }

    return max;

}

• The findLargest method iterates through the array and compares each element with the current largest value (max). If a larger element is found, max is updated.

Print the largest element:

System.out.println("The largest element in the array is: " + largest);

• The largest element found is printed to the console.

Close the Scanner:

scanner.close();

1. • The Scanner object is closed to free resources.

Example Input and Output:

Input:

Enter the number of elements in the array:

5

Enter the elements of the array:

10 25 17 9 30

Output:
The largest element in the array is: 30

Summary:

• The program reads an array of integers from the user.

• It iterates through the array to find the largest element.

• Finally, it prints the largest element.

Let me know if you'd like further clarification or any modifications!