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#include <stdlib.h>
struct node
{
int key;
struct node *left, *right;
};
struct node *newNode(int item)
{
struct node *temp = (struct node *)malloc(sizeof(struct node));
temp->key = item;
temp->left = temp->right = NULL;
return temp;
}
void inorder(struct node *root)
{
if (root != NULL)
{
inorder(root->left);
printf("%dt", root->key);
inorder(root->right);
}
}
struct node *insert(struct node *node, int key)
{
if (node == NULL)
return newNode(key);
if (key < node->key)
node->left = insert(node->left, key);
else
node->right = insert(node->right, key);
return node;
}
void preorder(struct node *root)
{
if (root != NULL)
{
printf("%dt", root->key);
preorder(root->left);
preorder(root->right);
}
}
void postorder(struct node *root)
{
if (root != NULL)
{
postorder(root->left);
postorder(root->right);
printf("%dt", root->key);
}
}
struct node* deleteNode(struct node* root, int key)
{
if (root == NULL)
return root;
if (key < root->key)
root->left = deleteNode(root->left, key);
else if (key > root->key)
root->right = deleteNode(root->right, key);
else
{
if (root->left == NULL)
{
struct node *temp = root->right;
free(root);
return temp;
}
else if (root->right == NULL)
{
struct node *temp = root->left;
free(root);
return temp;
}
}
return root;
}
int main()
{
struct node *root = NULL;
root=newNode(5);
printf("Inorder traversal: ");
inorder(root);
root = insert(root, 8);
root = insert(root, 3);
root = insert(root, 1);
root = insert(root, 6);
printf("nInorder traversal:n");
inorder(root);
printf("nPreorder traversal:n");
preorder(root);
printf("nPostorder traversal:n");
postorder(root);
printf("nDeleting node 1");
deleteNode(root,1);
printf("nInorder traversal:n");
inorder(root);
printf("nPreorder traversal:n");
preorder(root);
printf("nPostorder traversal:n");
postorder(root);
return 0;
}
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