C/C++ :: Pointer Values Into Pythagoras Calculation

I have a doubly linked list, which reads in a set of coordinates x and y.

I need to pass these coordinates into a method called calculateImportance and execute Pythagoras on them. With this in mind I need to be able to access the pointers current, next and prev.

The issue I am having, is that I am unable to pass the pointers through to the method?

This is the list.h

#include <iostream>
class List {
private:
typedef struct node {
int xCoord;
int yCoord;
float importanceFactor;

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