Binary Search Tree for C++

b_search_tree.cp

#include <iostream>

struct node
{
	int key;
	struct node *left, *right;
};

// A utility function to create a new BST node
struct node *newNode(int item)
{
	struct node *temp = (struct node *)malloc(sizeof(struct node));
	temp->key = item;
	temp->left = temp->right = NULL;
	return temp;
}

// A utility function to do inorder traversal of BST
void inorder(struct node *root)
{
	if (root != NULL)
	{
		inorder(root->left);
		printf("%d \n", root->key);
		inorder(root->right);
	}
}

/* A utility function to insert a new node with given key in BST */
struct node* insert(struct node* node, int key)
{
	/* If the tree is empty, return a new node */
	if (node == NULL) return newNode(key);

	/* Otherwise, recur down the tree */
	if (key < node->key)
		node->left = insert(node->left, key);
	else if (key > node->key)
		node->right = insert(node->right, key);

	/* return the (unchanged) node pointer */
	return node;
}

// Driver Program to test above functions
int main()
{
	/* Let us create following BST
			50
		/	 \
		30	 70
		/ \ / \
	20 40 60 80 */
	struct node *root = NULL;
	root = insert(root, 50);
	insert(root, 30);
	insert(root, 20);
	insert(root, 40);
	insert(root, 70);
	insert(root, 60);
	insert(root, 80);

	// print inoder traversal of the BST
	inorder(root);

	return 0;
}