Data Structures (INE2011)
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1 Data Structures (INE2011) Electronics and Communication Engineering Hanyang University Haewoon Nam Lecture 5 1
2 Linked List A chain of nodes Nodes are linked together using pointers NULL a b c d e A node has Zero or more data fields One or more pointer fields link or pointer field of node data fields of node 2
3 A Node Class node class Node int data; Node *link; ; Node data link Node data link 3
4 Singly Linked List A chain of nodes Null Class node class Node int data1; data1 55 data1 82 char data2; data2 c data2 f float data3; Node *link; data data ; 4
5 Class Node Class Node class Node friend class linkedlist; int i32data; node *pnext; public: Node(); Node(int val); Node(int val, Node *next); ; Node::Node() pnext = NULL; Node::Node(int val) i32data = val; pnext = NULL; Node::Node(int val, Node*next) i32data = val; pnext = next; 5
6 Class Linked List val NULL class linkedlist /* pointer of node */ Node *p; public: linkedlist(void); linkedlist(int val); ~linkedlist(void); void addnode(int val); void delnode(int val); ; linkedlist::linkedlist() p = NULL; linkedlist::linkedlist(int val) node *ptemp; if (val > 0) p = new Node(INIT_VALUE); ptemp = p; for (int i=1;i<val;i++) ptemp->pnext = new Node(INIT_VALUE); ptemp = ptemp->pnext; linkedlist::~linkedlist() delete[] p; 6
7 Class Linked List val val NULL void linkedlist::addnode(int val) node *pnewnode; node *ptemp; void linkedlist::delnode(void) node *ptemp, *pprev; node *pnextnode; pnewnode = new Node(val); ptemp = p; ptemp = p; if (ptemp!= NULL) while (ptemp->pnext!= NULL) ptemp = ptemp->pnext; ptemp->pnext = pnewnode; p = pnewnode; if (ptemp!= NULL) if (ptemp->pnext == NULL) p = NULL; do pprev = ptemp; ptemp = ptemp->pnext; while (ptemp->pnext!= NULL); pprev->pnext = NULL; 7
8 Singly Linked List Insert a node Null Null 8
9 Singly Linked List Insert a node void linkedlist::insertnode(node *pnode) node *pnewnode; if (pnode == NULL) p = new Node(INIT_VALUE); if (pnode->pnext == NULL) pnewnode = new Node(INIT_VALUE); pnode->pnext = pnewnode; pnewnode = new node(init_value, pnode->pnext); pnode->pnext = pnewnode; 9
10 Singly Linked List Delete a node Null Delete Null 10
11 Singly Linked List Delete a node void linkedlist::deletenode(node *pnode, Node *pprev) if (pprev->pnext == pnode) if (pnode == NULL) pprev->pnext = NULL; pprev->pnext = pnode->pnext; std::cout << "[Error] Check the first and second nodes!!" << std::endl; 11
12 Circular Linked List A circular chain of nodes Class node class Node data1 55 data1 82 int data1; char data2; float data3; data2 data3 c 3.14 data2 data3 f 0.53 Node *link; ; 12
13 A Node for Doubly Linked List Class node class Node int data1; char data2; float data3; Node *prev; Node *next; ; Node data prev next Node data prev next Node data prev next 13
14 Doubly Linked List A chain of nodes Class node class Node int data1; data1 55 data1 82 char data2; data2 c data2 f float data3; Node *prev; data data Node *next; ; 14
15 Class Node for Doubly Linked List Class Node class Node friend class linkedlist; int i32data; Node *pprev; Node *pnext; public: Node(); Node(int val); Node(int val, Node *next, Node *prev); ; Node::Node() pnext = NULL; pprev = NULL; Node::Node(int val) i32data = val; pnext = NULL; pprev = NULL; Node::Node(int val, Node*next, Node *prev) i32data = val; pnext = next; pprev = prev; 15
16 Class Doubly Linked List val NULL NULL tail class dlinkedlist node *p; node *ptail; public: dlinkedlist(); dlinkedlist(int val); ~dlinkedlist(); node * get(); node * gettail(); void addnode(int val); void delnode(void); ; dlinkedlist::dlinkedlist() p = NULL; ptail = NULL; dlinkedlist::dlinkedlist(int val) node *ptemp; if (val > 0) p = new Node(INIT_VALUE); ptemp = p; for (int i=1;i<val;i++) ptemp->pnext = new Node(INIT_VALUE); ptemp->pnext->pprev = ptemp; ptemp = ptemp->pnext; ptail = ptemp; p = NULL; ptail = NULL; 16
17 Class Doubly Linked List void dlinkedlist::addnode(int val) node *pnewnode; node *ptemp; ptemp = ptail; if (ptemp!= NULL) if (ptemp->pnext!= NULL) std::cout << No null pointer!!" << std::endl; pnewnode = new Node(val, ptemp, NULL); ptemp->pnext = pnewnode; ptail = ptail->pnext; ptail = pnewnode; p = ptail; val NULL val NULL void dlinkedlist::delnode(void) if (ptail!= NULL) if (ptail->pnext!= NULL) std::cout << No null pointer!!" << std::endl; ptail = ptail->pprev; ptail->pnext = NULL; std::cout << No node to delete!!" << std::endl; tail 17
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