算法学习1 单链表

贴上源码记录下学习过程：

估计有很多不合适甚至错误的地方，欢迎指正：

单链表：

#define NodeType int 
class Node
{
public:
   Node()
   {
      next = NULL;
      value = 0;
   }
   ~Node()
   {
      
   }
   friend class LinkList;
private:
   NodeType value;
   Node *next;
};

class LinkList
{
public:
   LinkList()
   {
      head = new Node;
   }
   ~LinkList()
   {
      delete head;
   }
//function:    add node to the tail
//val:   the add node's value
//return: success or not
   bool addNode(NodeType val)
   {
      bool ret = false;
      Node *node = new Node;
      if (node)
      {
         node->value = val;
         node->next = NULL;
         if (!head->next)//first node
         {
            head->next = node;
         }
         else
         {
            Node *temp = head;
            while(temp->next)
            {
               temp = temp->next;
            }
            temp->next = node;
         }
            ret = true;
      }
      return ret;
   }

//function:   delete all the match node
//val:   delete value
//num:   the number of delete nodes
   void delNode(const NodeType val,int &num)
   {
      bool ret = false;
      Node *loop = head;
      Node *pre = NULL;
      num = 0;
      while(loop->next)
      {
         pre =loop;
         Node *temp = loop = loop->next;
         if(val == temp->value)//find the match node
         {
            pre->next = temp->next;
            loop = pre;
            num++;
            delete temp;
            ret = true;
         }
      }
      if(!ret)
      {
         cout<<"No match Node or Empty List"<<endl;
      }
   }
//function:    clear the linklist
   void clear()
   {
      bool ret = false;
      Node *loop = head;
      Node *pre = NULL;
      while(loop->next)
      {
         pre =loop;
         Node *temp = loop = loop->next;
         pre->next = temp->next;
         loop = pre;
         delete temp;
         ret = true;
      }
      if (!ret)
      {
         cout<<"Empty List"<<endl;
      }
   }
//function: output the linklist
   void output()
   {
      bool ret = false;
      Node *temp = head;
      while(temp->next)
      {
         temp = temp->next;
         cout<<temp->value<<" ";
         ret = true;
      }
      if (!ret)
      {
         cout<<"Empty List"<<endl;
      }
   }
private:
   Node *head;
};


void main()
{
   LinkList link;
   link.addNode(5);
   link.output();
   int delNum=0,delValue=5;
   link.delNode(delValue,delNum);
   cout<<"after del"<<"    delNUm"<<delNum<<endl;
   link.output();
   link.clear();
   cout<<"after clear"<<endl;
   link.output();
}