#include <iostream.h>
#include <iomanip.h>
#include <assert.h>
#include <stdlib.h>
#include "plist.h"

List::~List()
{
   listPointer temp;

   while (list != NULL)
   {
      temp = list;
      list = list->next;   // unlink first item on list
      delete temp;         // delete it
      temp = NULL;
   }
}

void List::Insert(int newValue)
{
   listPointer temp = new listItem;
   assert (temp != NULL);

   temp->next = list;
   list = temp;
   temp->value = newValue;
}

int List::Delete(void)
{
   listPointer temp;
   int returnVal;   // value of first list item

   assert (list != NULL);
   returnVal = list->value;   // get value of first list item
   temp = list;
   list = list->next;   // unlink first list item
   delete temp;         // delete first list item
   temp = NULL;
   return returnVal;
}

void List::Print(void)
{

   for (listPointer i = list; i != NULL; i = i->next)
      cout << setw(10) << i->value << endl;
}