DSL_Assignment2
Pratham16
c_cpp
3 years ago
12 kB
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// Pratham Doke... SE-1... Rollno:- 21125
// Assignent 2:- BST
#include <iostream>
#include <string>
using namespace std;
// To avoid case issue while searching as well as while storing data
string convert(string s)
{
for (int i = 0; i < s.length(); i++)
{
s[i] = tolower(s[i]);
}
return s;
}
struct node // Structure of node
{
string data, meaning;
node *left, *right;
node()
{
data = "";
meaning = "";
left = NULL;
right = NULL;
}
};
class bst
{
node *root;
public:
bst()
{
root = nullptr;
}
node *return_node()
{
return root;
}
// To insert data in the tree
// Inserting a node.. according to the value which is entered
void insert(node *newnode)
{
string mean;
if (root == NULL)
{
root = newnode;
cout << "Enter meaning: ";
// cin.ignore();
getline(cin, mean);
newnode->meaning = mean;
cout << "\nData added successfully!!" << endl;
// cout << "\nRoot Created Successfully" << endl;
}
else
{
node *temp = root; // Traversing Node
while (true)
{
if (temp->data == newnode->data)
{
cout << "\nDuplicate data entered!!" << endl;
delete newnode;
break;
}
if (newnode->data < temp->data && temp->left == nullptr)
{
temp->left = newnode;
cout << "Enter the meaning: ";
// cin.ignore();
getline(cin, mean);
newnode->meaning = mean;
cout << "\nData added successfully!!" << endl;
break;
}
if (newnode->data > temp->data && temp->right == nullptr)
{
temp->right = newnode;
cout << "Enter the meaning: ";
// cin.ignore();
getline(cin, mean);
newnode->meaning = mean;
cout << "\nData added successfully!!" << endl;
break;
}
if (newnode->data > temp->data && temp->right != nullptr)
{
temp = temp->right;
}
if (newnode->data < temp->data && temp->left != nullptr)
{
temp = temp->left;
}
}
}
}
// Search and find the word in the tree
// Code is similar to binary search used in finding element in an array
// As data are sorted according to values in bst.. Binary search is best method to search an
// element in the tree..
void search_word(node *r, string word)
{
int count = 1;
if (r == nullptr)
{
cout << "Create Tree first" << endl;
}
else
{
bool b1 = true;
node *ptr = r;
while (ptr != nullptr)
{
if (ptr->data == word)
{
cout << "\nYour word: " << word << endl;
cout << "Meaning: " << ptr->meaning << endl;
cout << "\nNumber of comparision: " << count << endl;
b1 = false;
count = 0;
break;
}
if (word < ptr->data)
{
ptr = ptr->left;
count++;
}
else
{
ptr = ptr->right;
count++;
}
}
if (b1)
{
cout << "\nNo word exists in the dictionary!!!" << endl;
cout << "Total Number of comparison: " << count << endl;
count = 0;
}
}
}
// Update the meaning of the word
// Function used is searching method..
void update(node *r, string word)
{
if (r == nullptr)
{
cout << "Create Tree first" << endl;
}
else
{
string mean;
bool b1 = true;
node *ptr = r;
while (ptr != nullptr)
{
if (ptr->data == word)
{
cout << "\n**Your Word Found**" << endl;
cout << "\nCurrent Meaning: " << ptr->meaning << endl;
cout << "\nEnter the new meaning of the word" << endl;
getline(cin, mean);
ptr->meaning = mean;
cout << "\nMeaning of the word, updated successfully!!!" << endl;
b1 = false;
break;
}
if (word < ptr->data)
{
ptr = ptr->left;
}
else
{
ptr = ptr->right;
}
}
if (b1)
{
cout << "\n****No word exist in the dictionary!!****" << endl;
}
}
}
// Code for inorder traversal...
// Which display BST in ascending order
void ascending_order(node *r)
{
if (r == nullptr)
{
return;
}
else
{
ascending_order(r->left);
cout << r->data << "::" << r->meaning << endl;
ascending_order(r->right);
}
}
// A switch function, basically we can make mirror image of binary tree and display in inorder traversal
// So we can get our data printed in descending order
void mirror(node *r)
{
if (r == nullptr)
{
return;
}
else
{
node *temp = r->left;
r->left = r->right;
r->right = temp;
mirror(r->right);
mirror(r->left);
}
}
// A function which returns the node address which has lowest value in bst
node *minFunction(node *r)
{
node *temp = r;
while (temp->left != nullptr)
{
temp = temp->left;
}
return temp;
}
// A function which return the node address which has highest value in bst
node *maxFunction(node *r)
{
node *temp = r;
while (temp->right != nullptr)
{
temp = temp->right;
}
return temp;
}
//*****************To check the existence of searched word in the dictionary
int check_word(node *r, string word)
{
int count = 1;
node *ptr = root;
while (ptr != nullptr)
{
if (ptr->data == word)
{
cout << "\nNumber of comparision: " << count << endl;
return 1;
}
if (word < ptr->data)
{
ptr = ptr->left;
count++;
}
else
{
ptr = ptr->right;
count++;
}
}
return 0;
}
//*********
// ********************************To delete a node in BST.
node *deleteNode(node *r, string value)
{
node *temp;
if (r == NULL)
{
return r;
}
else if (value < r->data)
{
r->left = deleteNode(r->left, value);
}
else if (value > r->data)
{
r->right = deleteNode(r->right, value);
}
else
{
if (r->left == NULL)
{
temp = r->right;
delete r;
return temp;
}
if (r->right == NULL)
{
temp = temp->left;
delete r;
return temp;
}
else
{
temp = minFunction(r->right);
r->data = temp->data;
r->right = deleteNode(r->right, temp->data);
}
}
return r;
}
// Actual delete function.. which will delete the given data's node
void delete_a_word(node *r, string word)
{
if (check_word(r, word))
{
if(root->data == word && root->left == NULL && root->right == NULL)
{
node *temp = root;
delete temp;
root = nullptr;
}
else
{
deleteNode(r, word);
}
cout << "\nWord deleted Successfully!!!" << endl;
}
else
{
cout << "\nNo such word found in the dictionary!!!" << endl;
}
}
};
int main()
{
bst b1;
int option, p;
string search;
string val, mean;
while (option != -1)
{
node *newnode = new node();
cout << "\n1.Add a word.\n2.Search \n3.Display all Data in Ascending Order \n4.Display all Data in Descending Order." << endl;
cout << "5.Update a word. \n6.Delete a word \n-1.Exit" << endl;
cout << "Enter your choice: ";
cin >> option;
if(option == -1){
break;
}
switch (option)
{
case 1:
cout << "\nEnter the word: ";
cin.ignore();
getline(cin, val);
val = convert(val);
newnode->data = val;
b1.insert(newnode);
break;
case 2: // Searching a word in dicitonary
if (b1.return_node() == nullptr)
{
cout << "\nNo data Exists in the tree" << endl;
}
else
{
cout << "\nEnter the word you want to search: ";
cin.ignore();
getline(cin, search);
search = convert(search);
b1.search_word(b1.return_node(), search);
}
break;
case 3: // Ascending order
if (b1.return_node() == nullptr)
{
cout << "\nNo data exist in the tree to be displayed!!" << endl;
}
else
{
cout << "\n*****YOUR DATA**********" << endl;
b1.ascending_order(b1.return_node());
}
break;
case 4: // Descending Order
if (b1.return_node() == nullptr)
{
cout << "\nNo data exist in the tree be displayed!!" << endl;
}
else
{
cout << endl;
cout << "\n******YOUR DATA**********" << endl;
b1.mirror(b1.return_node());
b1.ascending_order(b1.return_node());
b1.mirror(b1.return_node());
}
break;
case 5: // Updating a word
if (b1.return_node() == nullptr)
{
cout << "\nNo data exist in the tree to be displayed!!" << endl;
}
else
{
cout << "\nEnter the word to be searched and update it's meaning: ";
cin.ignore();
getline(cin, search);
search = convert(search);
b1.update(b1.return_node(), search);
break;
}
case 6: // Deleting a word.
if(b1.return_node() != nullptr)
{
cout << "\nEnter a word to be deleted: ";
cin.ignore();
getline(cin, search);
search = convert(search);
b1.delete_a_word(b1.return_node(), search);
}
else
{
cout << "\nNo data exist in the tree to be displayed!!" << endl;
}
break;
default:
cout << "\nInvalid Choice!!!" << endl;
}
}
cout << "\nProgram Exited Successfully!!" << endl;
return 0;
}