/*--------------------------------------------------
created by st10 at Sun Nov 16 23:55:26 PST 2003
--------------------------------------------------*/
#include <iostream>
#include "sumCostsI.h"
using namespace std;

/*--------------------------------------------------
 Contract: sumCostsI : MyNodePtr -> double
 Purpose: sum the costs of the nodes from the
          MyNode pointed to by nPtr to the end
          of the linked list

 Examples: if nPtr points to a node with cost 1.50,
           whose nextPtr points to a node with cost 2.30,
           whose nextPtr points to a node with cost 0.50,
           whose nextPtr points to a node with cost 1.13,
           whose nextPtr points to NULL, then

           sumCostsI(nPtr) == 5.43
--------------------------------------------------*/

double sumCostsI (MyNodePtr nPtr)
{
    double sumCosts = 0;
    MyNodePtr currPtr = nPtr;

    // "walk" through nodes from here to end of
    //    list, summing the costs seen;
    while (currPtr != NULL)
    {
        sumCosts += currPtr->get_cost();

        currPtr = currPtr->get_nextPtr(); 
    }

    return sumCosts;
}