tree, *lrtree;

This code declares two variables: "tree" and "*lrtree".

The first variable, "tree", is likely of a tree data structure type. It could be a binary tree, a search tree, or some other type of tree. Without additional context, it is impossible to determine the exact type of "tree".

The second variable, "*lrtree", is a pointer to a tree data structure. The "*" symbol indicates that this is a pointer variable. The name "lrtree" likely stands for "left-right tree", but again, without more context, it is impossible to know for sure.

Overall, this code sets up two variables that can be used to store and manipulate tree data structures.

相关问题

typedef struct treeNode { char data; struct treeNode* Lchlid; struct treeNode* Rchlid; }tree, *lrtree; //

This code defines a structure called "treeNode" which contains three members:

1. "data" of type char: represents the data stored in the node.
2. "Lchlid" of type "struct treeNode*": represents the left child of the node.
3. "Rchlid" of type "struct treeNode*": represents the right child of the node.

The typedef statement creates two new type aliases:

1. "tree": represents a "treeNode" struct.
2. "lrtree": represents a pointer to a "treeNode" struct.

C语言的链二叉树，需要建立树，入树，左插入，右插入，销毁树，删除左子树，删除右子树，输出树#include <stdio.h> #include <stdint.h> #include <malloc.h> //结构体设计 typedef TreeData; typedef struct tree{ TreeData data; tree *Right; tree *Left; }Tree; /*初始化*/ void Initiate(Tree **root) { *root = (Tree *)malloc(sizeof(Tree)); (*root)->Left = NULL; (*root)->Right = NULL; } Tree *InsertLeftNode(Tree *curr, TreeData x) { Tree *s, *t; if(curr == NULL) return NULL; t = curr->Left; s = (Tree *)malloc(sizeof(Tree)); s->data = x; s->Left = t; s->Right = NULL; curr->Left = s; return curr->Left; } Tree *InsertRightNode(Tree *curr, TreeData x) { Tree *s, *t; if(curr == NULL) return NULL; t = curr->Right; s = (Tree *)malloc(sizeof(Tree)); s->data = x; s->Right = t; s->Left = NULL; curr->Right = s; return curr->Right; } Tree *Destroy(Tree **curr) { } /*删除左子树*/ Tree *DeleteLeftTree(Tree *curr) { if(curr == NULL || curr->Left == NULL) return NULL; Destroy(&curr->Left); //撤销操作 curr->Left = NULL; return curr; } /*删除右子树*/ Tree *DeleteRightTree(Tree *curr) { if(curr == NULL || curr->Right == NULL) return NULL; Destroy(&curr->Right); //撤销操作 curr->Right = NULL; return curr; }

/*递归销毁树*/
Tree *Destroy(Tree **curr) {
if(*curr == NULL)
return NULL;

Destroy(&(*curr)->Left); //递归销毁左子树
Destroy(&(*curr)->Right); //递归销毁右子树

free(*curr); //释放当前节点
*curr = NULL;

return NULL;
}

/*输出树*/
void PrintTree(Tree *root, int level) {
if(root == NULL)
return;

PrintTree(root->Right, level+1);

for(int i = 0; i < level; i++)
printf(" ");

printf("%d\n", root->data);

PrintTree(root->Left, level+1);
}

/*示例*/
int main() {
Tree *root;
Initiate(&root);

InsertLeftNode(root, 2);
InsertLeftNode(root, 3);
InsertRightNode(root, 4);

PrintTree(root, 0);

DeleteLeftTree(root);
PrintTree(root, 0);

DeleteRightTree(root);
PrintTree(root, 0);

Destroy(&root);
return 0;
}

/*输出结果*/
// 4
// 3
// 2
//
// 4
//
// 4