Step 2: Count elements of the singly linked list
To count all elements of the linked list, we will need a loop to traverse through the linked list. We will let a pointer (i) of ListElem type to point to the pfirst then move the pointer to its next element and increase the number of item(t) one at a time by using a while loop until the end of the linked list(indicated by NULL value) is reached.
template <class Type>
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