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justhomework/ex5/list.cpp

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2021-10-21 16:13:46 +00:00
#include "list.h"
List::List()
{
_size = 0;
header->data = 0;
header->succ = trailer;
header->pred = NULL;
trailer->succ = NULL;
trailer->pred = header;
}
Node List::predInsert(Node Old, int New)
{
Node T = new node;
T->data = New;
T->succ = Old;
T->pred = Old->pred;
Old->pred = T;
_size++;
return T;
}
Node List::succInsert(Node Old, int New)
{
Node T = new node;
T->data = New;
T->pred = Old;
T->succ = Old->succ;
Old->succ = T;
_size++;
return T;
}
void List::firstInsert(int New)
{
Node T = new node;
T->data = New;
T->pred = header;
T->succ = header->succ;
header->succ = T;
_size++;
}
void List::lastInsert(int New)
{
Node T = new node;
T->data = New;
T->succ = trailer;
T->pred = trailer->pred;
trailer->pred = T;
_size++;
}
Node List::predInsertN(Node Old, Node New)
{
Node T = new node;
T = New;
T->succ = Old;
T->pred = Old->pred;
Old->pred = T;
_size++;
return T;
}
Node List::succInsertN(Node Old, Node New)
{
Node T = new node;
T = New;
T->pred = Old;
T->succ = Old->succ;
Old->succ = T;
_size++;
return T;
}
Node List::firstInsertN(Node New)
{
Node T = new node;
T = New;
T->pred = header;
T->succ = header->succ;
header->succ = T;
_size++;
return T;
}
Node List::lastInsertN(Node New)
{
Node T = new node;
T = New;
T->succ = trailer;
T->pred = trailer->pred;
trailer->pred = T;
_size++;
return T;
}
Node List::find(int i)
{
Node ans = first();
for (int i = 0; i < _size; i++)
{
ans = ans->succ;
}
return ans;
}
int List::get(int i)
{
return find(i)->data;
}