We want to add a function sum() to the class Node that implements user defined lists of

Fantastic news! We've Found the answer you've been seeking!

Question:

We want to add a function sum() to the class Node that implements user defined lists of numbers which will compute the sum of the values in a list. An incomplete implementation of sum() given below. You have to provide an expression to put in place of *** on the last line. You may assume that the quantities