Prog2/ArrayManipulation.java

import java.util.Arrays;

public class ArrayManipulation {
  public static int[] reverseArray(int[] arr) {
    for (int i = 0; i < arr.length / 2; i++) {
      int tmp = arr[i];
      arr[i] = arr[arr.length - 1 - i];
      arr[arr.length - 1 - i] = tmp;
    }
    return arr;
  }

  public static int[] squareEach(int[] arr){
    int[] square = new int[arr.length];
    for (int i = 0; i < arr.length; i++) {
      square[i] = arr[i] * arr[i];
    }
    return square;
  }

  public static int[] removeFirst(int[] arr){
    int[] firstRemoved = new int[arr.length -1];
    for(int i = 0; i < firstRemoved.length; i = i + 1) {
        firstRemoved[i] = arr[i + 1];
    }
    return firstRemoved;
}

  public static int[] removeLast(int[] arr) {
    int[] lastRemoved = new int [arr.length - 1];
    for (int i = 0; i < lastRemoved.length; i = i + 1) {
      lastRemoved[i] = arr[i];
    }
    return lastRemoved;
  }
  
  public static void main(String[] args) {
    int[] arr = { 1, 2, 3, 4, 5 };
    System.out.println(Arrays.toString(reverseArray(arr)));
    System.out.println(Arrays.toString(squareEach(arr)));
    System.out.println(Arrays.toString(removeLast(arr)));
    System.out.println(Arrays.toString(removeFirst(arr))); 
  }
}