二叉树链表结构表示法

二叉树链表的结构声明：

  struct  tree

{

         int data;

         struct tree *left;

         stryct tree *right;

};

        typedef struct tree treenode;

        typedef  treenode *btree;

#include"iostream"
using namespace std;

struct tree              //二叉树结构声明
{
    int data;
    struct tree *left;
    struct tree *right;

};
typedef  struct  tree treenode;
typedef  treenode *btree;
/*----插入二叉树的结点-------*/


btree  insertnode(btree root,int value)
{
    btree newnode;               //树根指针
    btree current;               //目前树结点指针
    btree back;                  //父结点指针

    /*-----创建结点内存----*/
    newnode=(btree)malloc(sizeof(treenode));  
    /*-------初始化-----*/
    newnode->data=value;
    newnode->left=NULL;
    newnode->right=NULL;

    if(root == NULL) //是否为根结点      
    {
        return newnode;
    }
    else 
    {
        current =root;            //保留目前树指针
        while(current!=NULL)
        {
            back=current;
            if(current->data>value)
                  current =current->left;
              else 
                  current=current->right;
        }
        if(back->data>value)
             back->left=newnode;
        else 
            back->right=newnode;

    }
    return root;
    
}
/*----创建二叉树---*/
  btree  createbtree( int *data,int len)
  {

      btree root=NULL;
      int i;

      for(i=0;i<len;i++)
        root=insertnode(root,data[i]);
      return root;
  }
  /*-------儿二叉树的输出-------*/
void  printbtree(btree root)
{
    btree ptr;
    ptr=root->left;
    printf("输出左子树：\n");
    while(ptr!=NULL)
    {
        printf("[%2d]\n",ptr->data);
        ptr=ptr->left;
    }
    ptr=root->right;
    printf("输出右子树：\n");
    while(ptr!=NULL)
    {
        printf("[%2d]\n",ptr->data);
        ptr=ptr->right;
    }

}
/*------链表二叉树---------*/
  int main()
  { 
      btree root =NULL;
      int data[10]={5,6,4,8,2,3,7,1,9};
    root=createbtree(data,9);

    printf("树的结点内容：\n");
    printbtree(root);
          
}