代码如下。具体处理见注释。个人原创，非官方。

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#include

#include

#include

#define TREE_TYPE int

#define size 15

/**定义树形结构*/

typedef struct Tree

{

TREE_TYPE value;

struct Tree *left;

struct Tree *right;

}Tree_node;

/**根节点作为全局静态变量*/

static Tree_node *root;

/**初始化树*/

void create_tree()

{

root = NULL;

}

/**向树种插入数据*/

Tree_node* insert(Tree_node *node,TREE_TYPE value)

{

if(node == NULL)

{

node = (Tree_node*)malloc(sizeof(Tree_node) * 1);

node-> value = value;

node -> left = NULL;

node -> right = NULL;

if(root == NULL) //如果为根节点

root = node;

}

else

{

if(value < node->value) //比该节点值小，写向左子树

node->left = insert(node->left,value);

else //比该节点值大，写向右子树

node->right = insert(node->right,value);

}

return node;

}

/**显示树中所有节点内容*/

void show_all(Tree_node *node)

{

if(node != NULL)

{

if(node->left != NULL)

show_all(node->left);

printf("%d ",node->value);

if(node->right != NULL);

show_all(node->right);

}

}

/**根据值查找某一特定节点*/

Tree_node* search(Tree_node *node,TREE_TYPE value)

{

Tree_node *result = NULL;

if(node != NULL)

{

if(value == node->value)

result = node;

else if(value < node->value)

result = search(node->left,value);

else

result = search(node->right,value);

}

return result;

}

/**找到某一值对应节点的父节点*/

Tree_node* find_parent(Tree_node *parent,TREE_TYPE value)

{

Tree_node *result = NULL;

if(parent != NULL)

{

if(value < parent->value && parent->left != NULL) //比父节点值小，访问左子树

{

if(value == parent->left->value)

result = parent;

else

{

result = find_parent(parent->left,value);

if(result == NULL)

result = find_parent(parent->right,value);

}

}

if(value > parent->value && parent->right != NULL) //比父节点值大，访问右子树

{

if(value == parent->right->value)

result = parent;

else

{

result = find_parent(parent->left,value);

if(result == NULL)

result = find_parent(parent->right,value);

}

}

}

return result;

}

void delete(TREE_TYPE value)

{

Tree_node *parent = find_parent(root,value); //找到待删节点的父节点

Tree_node *node = search(root,value); //找到待删节点

if(node == NULL) //待删节点不存在

printf("没有待删节点\n");

else //待删节点存在

{

if(node->left == NULL && node->right == NULL) //如果待删节点是叶子节点

{

// assert(parent != NULL);

if(parent == NULL) //如果是根节点

root = NULL;

else //其他节点

{

if(node == parent->left)

parent->left = NULL;

else

parent->right = NULL;

}

}

else if(node->right == NULL) //如果待删节点只有左子树节点

{

if(parent == NULL) //如果是根节点

root = node->left;

else //其他节点

{

if(node == parent->left)

parent->left = node->left;

else

parent->right = node->left;

}

}

else if(node->left == NULL) //如果待删节点只有右子树节点

{

if(parent == NULL) //如果是根节点

root = node->right;

else //其他节点

{

if(node == parent->left)

parent->left = node->right;

else

parent->right = node->right;

}

}

else //如果带删节点左右子树节点都存在

{

Tree_node *new_node = node->right; //需要找到右子树的最左那个

Tree_node *new_node_parent = NULL;

while(new_node->left != NULL)

{

new_node_parent = new_node;

new_node = new_node->left;

}

if(new_node != node->left)

new_node->left = node->left;

if(new_node != node->right)

new_node->right = node->right;

if(parent == NULL)

root = new_node;

else

{

if(node == parent->left) //如果带删节点是父节点的左节点

parent->left = new_node;

else //如果待删节点是父节点的右节点

parent->right = new_node;

}

if(new_node_parent != NULL)//将原来的右子树最左节点删掉

new_node_parent->left = NULL;

}

}

}

int main()

{

/**初始化*/

create_tree();

/**插入*/

TREE_TYPE list[size] = {8,4,11,2,6,10,13,1,3,5,7,9,15,14,16};

int i;

for(i = 0; i < size; i++)

insert(root,list[i]);

/**显示全部*/

show_all(root);

putchar('\n');

/**根据值查找某节点*/

Tree_node *result = search(root,14);

if(result != NULL)

printf("To find %d,result is %d\n",14,result->value);

else

printf("Not find\n");

/**根据值查找其父节点*/

Tree_node *parent_result = find_parent(root,14);

if(parent_result != NULL)

printf("To find %d's parent,result is %d\n",14,parent_result->value);

else

printf("Cannot find %d's parent\n",14);

/**删除*/

delete(14); //删除叶子节点

show_all(root);

putchar('\n');

delete(13); //删除只有右子树的节点

show_all(root);

putchar('\n');

delete(11); //删除只有左子树的节点

show_all(root);

putchar('\n');

delete(4); //删除左右子树都有的节点

show_all(root);

putchar('\n');

return 0;

}