NOTE n is the size of the array

INSERTION
Array = {11, 12, 13, 14}; n = 4; insert 15 at position 2; posi = 2;
- FORWARD SHIFTING
for(int i = n - 1; i >= posi - 1; i--)
{
array[i+1] = array[i];
}
- assign value to be inserted at the target index

- n++

DELETION
Array = {11, 12, 13, 14}; n = 4;
DELETE position 2 Posi = 2;

- BACKWARD SHIFTING
for(int i = posi - 1; i< n; i++)
{
array[i] = array[i+1];
}