Question

Write a loop that sets each array element to the sum of itself and the next element, except for the last element which stays the same. Be careful not to index beyond the last element. Ex:

Answer 1

Hi, you haven't provided the programing language in which you need the code, I'll explain how to do it using Python, and you can follow the same logic to make a program in the programing language that you need.

Answer:

#Python

array = [5,2,3,4,5,0,7,1,9,8,2,7]

for i in range(len(array)-1):

   array[i] = array[i]+array[i+1]

print(array)

Explanation:

First, we create an array, then a for loop that iterates from the beginning of the array to the penultimate value, this avoids changes in the last value of the array, we modify the array elements, except the last one, by adding the current element and the next element, finally, we print the result.

Answer 2

Answer:

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

    arr[i] = arr[i] + arr[i+1];

}

Explanation:

The above code has been written using Java.

Let the given array be arr.

To set each element in the array (except the last element) to the sum of itself and the next element, ;

=> first create a loop that cycles through the array from the first element (zeroth index) to the penultimate element as follows;

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

}

=> at each of the cycles of the loop, the array element at that position (dictated by the value of i) is assigned a new value equal to the sum of its old value and the value of the next element to it as follows;

arr[i] = arr[i] + arr[i+1]

where arr[i] is the current array element and arr[i+1] is the next array element to the current element.

Putting all of these together, we have

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

    arr[i] = arr[i] + arr[i+1];

}

Notice that the loop goes from i=0 to i < arr.length-1. This shows that the loop will not directly get to the last element (where i = arr.length-1), thereby leaving the last element unchanged.