Question

Consider the following method, which is intended to return an array of integers that contains the elements of the parameter arr arranged in reverse order. For example array containing (-5, 3, 2, 7) then a new array (-5, 3, 2, 7) contains should be returned and the parameter are should be left unchanged .

public static int[] reverse(int) arr)
Intl new new intarr.length);
for (int k = 0; K arr.length: )
* Bissing statement / return newer;

Write down the statements that can be used to replace / Missing statement so that the method works as intended?

Answer 1

The missing statement for the Java method is a loop that copies the elements from the end of the input array 'arr' to the start of the new array 'newarr' thereby reversing the array.

Step-by-step explanation:

The student is tasked with completing a Java method which takes an integer array as a parameter and returns a new array that contains the elements of the input array in reverse order. The given array should remain unchanged. This problem relates to array manipulation in Java programming, specifically the concept of reversing an array.

To accomplish the task, we must iterate over the input array from the last element to the first, and copy each element into the new array starting from the first position. Here is the missing statement that should be placed inside the method to make it work as intended:

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

This loop goes through the array and assigns the elements to the newarr in reverse order.

Answer 2

Code:

public static int[] reverse(int [] arr){

Int [] newArr = new int[arr.length];

for (int k = 0; k<arr.length;k++){

/*Missing statement */

}

return newArr;

Answer:

Replace the comment with:

newArr[k] = arr[arr.length-k];

Step-by-step explanation:

Required

Complete the code

In the given code:

The first line of the given code defines the method

public static int[] reverse(int [] arr){

The next line declares array newArr withe same length as array arr

Int [] newArr = new int[arr.length];

The next line iterates through the elements of array arr

for (int k = 0; k<arr.length;k++){

The /* Missing statement */ is then replaced with:

newArr[k] = arr[arr.length-k];

The above statement gets the elements of array arr in reversed order.

This is so because, as the iteration iterates through array arr in ascending order, arr.length-k gets the element in reversed order