twoPointers.java

// Question: Reverse the elements of an array.
package arrays;
import java.util.Scanner;
public class twoPointers {
public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    System.out.println("Enter the number of elements: ");
    int n=sc.nextInt();
    int[] arr=new int[n];
    System.out.println("Enter the elements: ");
    for(int i=0; i<n; i++){
        arr[i]=sc.nextInt();
    }
    // METHOD 1:
    // for(int i=0; i<=n/2; i++){
    //     int j=n-1-i;
    //     int temp=arr[i];
    //     arr[i]=arr[j];
    //     arr[j]=temp;
    //    }
    
    // METHOD 2:
    int i=0, j=n-1;
    while (i<=j) {
        int temp=arr[i];
        arr[i]=arr[j];
        arr[j]=temp;
        i++;
        j--;
    }
    System.out.println("New array is: ");
     for(int a=0; a<n; a++){
    System.out.print(arr[a]+" ");
}
    }
}