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using namespace std;
class node{
public:
int value;
node *left;
node *right;
};
class btree{
public:
btree();
~btree();
void insert(int key);
node *search(int key);
void destroy_tree();
void inorder();
void postorder();
void preorder();
private:
void destroy_tree(node *leaf);
void insert(int key, node *leaf);
node *search(int key, node *leaf);
void inorder_print(node *leaf, int level);
void postorder_print(node *leaf);
void preorder_print(node *leaf);
node *root;
};
btree::btree(){
root = NULL;
}
btree::~btree(){
destroy_tree();
}
void btree::destroy_tree(node *leaf){
if(leaf != NULL){
destroy_tree(leaf->left);
destroy_tree(leaf->right);
delete leaf;
}
}
void btree::insert(int key, node *leaf){
if(key < leaf->value){
if(leaf->left != NULL){
insert(key, leaf->left);
}else{
leaf->left = new node;
leaf->left->value = key;
leaf->left->left = NULL;
leaf->left->right = NULL;
}
}else if(key >= leaf->value){
if(leaf->right != NULL){
insert(key, leaf->right);
}else{
leaf->right = new node;
leaf->right->value = key;
leaf->right->right = NULL;
leaf->right->left = NULL;
}
}
}
void btree::insert(int key){
if(root != NULL){
insert(key, root);
}else{
root = new node;
root->value = key;
root->left = NULL;
root->right = NULL;
}
}
node *btree::search(int key, node *leaf){
if(leaf != NULL){
if(key == leaf->value){
return leaf;
}
if(key < leaf->value){
return search(key, leaf->left);
}else{
return search(key, leaf->right);
}
}else{
return NULL;
}
}
node *btree::search(int key){
return search(key, root);
}
void btree::destroy_tree(){
destroy_tree(root);
}
void btree::inorder(){
inorder_print(root,0);
cout << "n";
}
void btree::inorder_print(node *leaf, int level){
if(leaf != NULL){
level +=5;
inorder_print(leaf->left,level);
for(int i=0;i<level;i++)
cout<<" ";
cout << leaf->value<<endl;
// cout << leaf->value << ",";
inorder_print(leaf->right,level);
}
}
void btree::postorder(){
postorder_print(root);
cout << "n";
}
void btree::postorder_print(node *leaf){
if(leaf != NULL){
int level;
level += 5;
inorder_print(leaf->left, level);
for(int i=0;i<level;i++)
cout<<" ";
inorder_print(leaf->right, level);
cout << leaf->value <<endl;
}
}
void btree::preorder(){
preorder_print(root);
cout << "n";
}
void btree::preorder_print(node *leaf){
if(leaf != NULL){
int level;
level += 5;
cout << leaf->value<<endl;
inorder_print(leaf->left, level);
for(int i=0;i<level;i++)
cout<<" ";
inorder_print(leaf->right, level);
}
}
int main(){
btree tree;
int num;
int choice;
char ch='Y';
node n1;
while(1)
{
cout<<endl;
cout<<"1. Insert number in the tree."<<endl;
cout<<"2. Display the binary tree as inorder."<<endl;
cout<<"3. Display the binary tree as pre-order."<<endl;
cout<<"4. Display the binary tree as post-order."<<endl;
cout<<endl;
cout<<"Enter your choice: ";
cin>>choice;
switch(choice)
{
case 1:
{
while(ch=='Y'||ch=='y')
{
cout<<"Enter the number you want to add: ";
cin>>num;
tree.insert(num);
cout<<"Do you want to add another node?(Y/N)";
cin>>ch;
}
break;
}
case 2:
{
tree.inorder();
cout<<endl;
break;
}
case 3:
{
tree.preorder();
cout<<endl;
break;
}
case 4:
{
tree.postorder();
cout<<endl;
break;
}
default:
break;
}
}
return 0;
// tree->preorder_print();
// tree.inorder();
// tree->postorder_print();
// delete tree;
}
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