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Original.cpp
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Original.cpp
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#include "LinkedList.h"
#include "ItemType.h"
LinkedList::LinkedList()
{
length = 0;
listData = NULL;
}
LinkedList::~LinkedList()
{
MakeEmpty();
}
bool LinkedList::IsEmpty() const
{
return(listData == NULL)? true: false;
}
int LinkedList::GetLength() const
{
return length;
}
void LinkedList::InsertItem(ItemType item)
{
NodeType* location;
location = new NodeType;
location->info = item;
location->next = listData;
listData = location;
length++;
}
void LinkedList::MakeEmpty()
{
NodeType *tempPtr;
while(listData != NULL)
{
tempPtr = listData;
listData = listData->next;
delete tempPtr;
}
length = 0;
listData = NULL;
}
void LinkedList::RetrieveItem(ItemType& item, bool& found)
{
bool moreToSearch;
NodeType* location;
location = listData;
found = false;
moreToSearch = (location != NULL);
while (moreToSearch && !found)
{
if (item.ComparedTo(location->info))
{
found = true;
item = location->info;
}
else
{
location = location->next;
moreToSearch = (location != NULL);
}
}
}
void LinkedList::PrintList(LinkedList& list)
{
int length;
ItemType item;
list.ResetList();
length = list.GetLength();
for(int counter =1; counter<=length;counter++)
{
list.GetNextItem(item);
item.Print();
}
}
void LinkedList::DeleteItem(ItemType item)
{
NodeType* location = listData;
NodeType* tempLocation;
if(item.ComparedTo(listData->info) == EQUAL)
{
tempLocation = location;
listData = listData->next;
}
else
{
while (item.ComparedTo((location->next)->info) != EQUAL)
location = location->next;
tempLocation = location->next;
location->next = (location->next)->next;
}
delete tempLocation;
length--;
}
void LinkedList::ResetList()
{
currentPos = NULL;
}
void LinkedList::GetNextItem(ItemType& item)
{
if (currentPos == NULL)
currentPos = listData;
else
currentPos = currentPos->next;
item = currentPos->info;
}