Tree Implementation
Tree can be implemented in 2 ways;
- Tree implementation Using Link List in C++
- Tree implementation Using Arrays in C++
Program to implement Tree with Link List and Pointers in C++
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#include <iostream> using namespace std; struct node{ int value; node *Left_Pointer; node *Right_Pointer; }; class Binary_Tree{ public: Binary_Tree(); ~Binary_Tree(); void Add(int key); node *search(int key); void Delete_tree(); void inorder_Display(); void postorder_Display(); void preorder_Display(); private: void Delete_tree(node *leaf); void Add(int key, node *leaf); node *search(int key, node *leaf); void inorder_Display(node *leaf); void postorder_Display(node *leaf); void preorder_Display(node *leaf); node *root; }; Binary_Tree::Binary_Tree(){ root = NULL; } Binary_Tree::~Binary_Tree(){ Delete_tree(); } void Binary_Tree::Delete_tree(node *leaf){ if(leaf != NULL){ Delete_tree(leaf->Left_Pointer); Delete_tree(leaf->Right_Pointer); delete leaf; } } void Binary_Tree::Add(int key, node *leaf){ if(key < leaf->value){ if(leaf->Left_Pointer != NULL){
Add(key, leaf->Left_Pointer); }else{ leaf->Left_Pointer = new node; leaf->Left_Pointer->value = key; leaf->Left_Pointer->Left_Pointer = NULL; leaf->Left_Pointer->Right_Pointer = NULL; } }else if(key >= leaf->value){ if(leaf->Right_Pointer != NULL){ Add(key, leaf->Right_Pointer); }else{ leaf->Right_Pointer = new node; leaf->Right_Pointer->value = key; leaf->Right_Pointer->Right_Pointer = NULL; leaf->Right_Pointer->Left_Pointer = NULL; } } } void Binary_Tree::Add(int key){ if(root != NULL){ Add(key, root); }else{ root = new node; root->value = key
; root->Left_Pointer = NULL; root->Right_Pointer = NULL; } } node *Binary_Tree::search(int key, node *leaf){ if(leaf != NULL){ if(key == leaf->value){ return leaf; } if(key < leaf->value){ return search(key, leaf->Left_Pointer); }else{ return search(key, leaf->Right_Pointer); } }else{ return NULL; } } node *Binary_Tree::search(int key){ return search(key, root); } void Binary_Tree::Delete_tree(){ Delete_tree(root); } void Binary_Tree::inorder_Display(){ inorder_Display(root); cout << "\n"; } void Binary_Tree::inorder_Display(node *leaf){ if(leaf != NULL){ inorder_Display(leaf->Left_Pointer); cout << leaf->value << ","; inorder_Display(leaf->Right_Pointer); } } void Binary_Tree::postorder_Display(){ postorder_Display(root); cout << "\n"; } void Binary_Tree::postorder_Display(node *leaf){ if(leaf != NULL){ inorder_Display(leaf->Left_Pointer); inorder_Display(leaf->Right_Pointer); cout << leaf->value << ","; } } void Binary_Tree::preorder_Display(){ preorder_Display(root); cout << "\n"; } void Binary_Tree::preorder_Display(node *leaf){ if(leaf != NULL){ cout << leaf->value << ","; inorder_Display(leaf->Left_Pointer); inorder_Display(leaf->Right_Pointer); } } int main(){ //Binary_Tree tree; Binary_Tree *tree = new Binary_Tree(); tree->Add(4); tree->Add(66); tree->Add(9); tree->Add(44); tree->Add(3); tree->Add(2); tree->Add(77); tree->preorder_Display(); tree->inorder_Display(); tree->postorder_Display(); delete tree; } |
Output
4, 2, 3, 9, 44, 66, 77
2, 3, 4, 9, 44, 66, 77
2, 3, 9, 44, 66, 77, 4,