在二叉搜索树中插入节点时堆栈溢出
Stack Overflow when inserting a node in a Binary Search Tree
我是 C++ 编程的新手,但我正在尝试创建二叉搜索树。
该程序似乎编译正常,但它给了我这个错误:
Unhandled exception at 0x009229B7 in Lab001_CS3.exe: 0xC00000FD: Stack
overflow (parameters: 0x00000001, 0x00AD2FBC).
当我尝试 运行 时。错误发生在这行代码:
void insert(int value) {
...
}
我不确定我做错了什么,而且我以前从未遇到过这个错误。
代码如下:
#include <iostream>
using namespace std;
//create a node struct
struct node {
//member variables
int key;
node* left;
node* right;
//default constructor
node() {
key = 0;
left = NULL;
right = NULL;
cout << "a new node is created" << endl;
}
//constructor so can create a node in one line
node(int k) {
key = k;
left = NULL;
right = NULL;
cout << "a new node is created" << endl;
}
};
class Tree {
public:
//root node
node root;
//default constructor
Tree() {
root.key = 0;
root.left = NULL;
root.right = NULL;
}
//constructor to create the root node
Tree(int data) {
//set the data to the key
//set the right and left pointers to null
root.key = data;
root.left = NULL;
root.right = NULL;
}
//print the root node
void printRootNode() {
cout << "Root Node - Key: " << root.key << endl;
}
//insert functions
void insert(int value) {
/* If the newNode's key is less than the root key, traverse left
*/
if (value < root.key) {
/* if the left node is NULL */
if (root.left == NULL) {
root.left = new node(value);
cout << "assigned left" << endl;
}
else {
/* if the left node is important */
insert(value);
cout << "recurse" << endl;
}
}
if (value > root.key) {
/* if the right node is NULL */
if (root.right == NULL) {
root.right = new node(value);
cout << "assigned right" << endl;
}
else {
/* if the right node is important */
insert(value);
cout << "recurse" << endl;
}
}
}
};
//print inorder
void inorder(node* rt) {
//base
if (rt == NULL) {
return;
}
inorder(rt->left);
cout << " " << rt->key << endl;
inorder(rt->right);
}
int main() {
//create a tree for a root node
Tree t(16);
t.printRootNode();
//create newNode
node n1(20);
node n2(31);
//insert the new nodes
t.insert(20);
t.insert(31);
//keep the window from closing
system("pause");
}
感谢您的帮助。
在你的 insert()
if (value < root.key) {
/* if the left node is NULL */
if (root.left == NULL) {
root.left = new node(value);
cout << "assigned left" << endl;
}
else {
/* if the left node is important */
insert(value);
cout << "recurse" << endl;
}
}
以这个向左走的代码为例,如果root.left != NULL 代码会进入else块,永远递归调用insert(value),导致栈溢出,正确的操作是make current node移动到 root.left,然后递归调用 insert(value)。
而且你根本不需要节点 class,树 class 可以做所有的事情。
再次强调,这里不是帮助您调试的好地方,您需要自己学习如何调试:-)。
我是 C++ 编程的新手,但我正在尝试创建二叉搜索树。
该程序似乎编译正常,但它给了我这个错误:
Unhandled exception at 0x009229B7 in Lab001_CS3.exe: 0xC00000FD: Stack
overflow (parameters: 0x00000001, 0x00AD2FBC).
当我尝试 运行 时。错误发生在这行代码:
void insert(int value) {
...
}
我不确定我做错了什么,而且我以前从未遇到过这个错误。
代码如下:
#include <iostream>
using namespace std;
//create a node struct
struct node {
//member variables
int key;
node* left;
node* right;
//default constructor
node() {
key = 0;
left = NULL;
right = NULL;
cout << "a new node is created" << endl;
}
//constructor so can create a node in one line
node(int k) {
key = k;
left = NULL;
right = NULL;
cout << "a new node is created" << endl;
}
};
class Tree {
public:
//root node
node root;
//default constructor
Tree() {
root.key = 0;
root.left = NULL;
root.right = NULL;
}
//constructor to create the root node
Tree(int data) {
//set the data to the key
//set the right and left pointers to null
root.key = data;
root.left = NULL;
root.right = NULL;
}
//print the root node
void printRootNode() {
cout << "Root Node - Key: " << root.key << endl;
}
//insert functions
void insert(int value) {
/* If the newNode's key is less than the root key, traverse left
*/
if (value < root.key) {
/* if the left node is NULL */
if (root.left == NULL) {
root.left = new node(value);
cout << "assigned left" << endl;
}
else {
/* if the left node is important */
insert(value);
cout << "recurse" << endl;
}
}
if (value > root.key) {
/* if the right node is NULL */
if (root.right == NULL) {
root.right = new node(value);
cout << "assigned right" << endl;
}
else {
/* if the right node is important */
insert(value);
cout << "recurse" << endl;
}
}
}
};
//print inorder
void inorder(node* rt) {
//base
if (rt == NULL) {
return;
}
inorder(rt->left);
cout << " " << rt->key << endl;
inorder(rt->right);
}
int main() {
//create a tree for a root node
Tree t(16);
t.printRootNode();
//create newNode
node n1(20);
node n2(31);
//insert the new nodes
t.insert(20);
t.insert(31);
//keep the window from closing
system("pause");
}
感谢您的帮助。
在你的 insert()
if (value < root.key) {
/* if the left node is NULL */
if (root.left == NULL) {
root.left = new node(value);
cout << "assigned left" << endl;
}
else {
/* if the left node is important */
insert(value);
cout << "recurse" << endl;
}
}
以这个向左走的代码为例,如果root.left != NULL 代码会进入else块,永远递归调用insert(value),导致栈溢出,正确的操作是make current node移动到 root.left,然后递归调用 insert(value)。
而且你根本不需要节点 class,树 class 可以做所有的事情。
再次强调,这里不是帮助您调试的好地方,您需要自己学习如何调试:-)。