Untitled

// 21143 Tanmay Karmarkar 
//DSAL Assignment-2
// A Dictionary stores keywords and its meanings. Provide facility for adding new keywords,
// deleting keywords, updating values of any entry.
// Provide facility to display whole data sorted in ascending/ Descending order.
// Also find how many maximum comparisons may require for finding any keyword.
// Use Binary Search Tree for implementation.
#include <iostream>
using namespace std;
int count=0;
struct Node
{
    string keyword, meaning;
    Node *left, *right;
};

Node *newNode(string keyword, string meaning)
{
    Node *newNode = new Node;
    newNode->keyword = keyword;
    newNode->meaning = meaning;
    newNode->left = NULL;
    newNode->right = NULL;
    return newNode;
};
bool correct(string a)
{
    bool op = true;
    for (int i = 0; i < a.length(); i++)
    {
        char ch = a[i];
        if (ch >= 97 && ch <= 122)
        {
            continue;
        }
        else if (ch == 32 || ch == 44 || ch == 39 || ch == 46) // 32 is space 44 is comma 39 is apostrophe 46 fullstop.
        {
            continue;
        }
        else
        {
            op = false;
        }
    }
    return op;
};



Node *insert(Node *root, string keyword, string meaning)
{
    if (root == NULL)
    {
        root = newNode(keyword, meaning);
    }
    else if (keyword <= root->keyword)
    {
        root->left = insert(root->left, keyword, meaning);
    }
    else
    {
        root->right = insert(root->right, keyword, meaning);
    }

    return root;
};

Node *create(Node *root)

{
    string keyword, meaning;
    bool x = true;
    bool y=true;
    while (x)
    {
        try
        {
            
            cout << "Enter keyword : ";
            cin>>keyword;
            if (correct(keyword) == false)
            {
                throw 1;
            }
            else
            {
                x = false;
            }
        }
        catch (...)
        {
            cout << "Enter valid string" << endl;
        }
    }
    while (y)
    {
        try
        {
            cout << "Enter meaning : ";
            getline(cin>>ws,meaning);
            if (correct(meaning) == false)
            {
                throw 1;
            }
            else
            {
                y = false;
            }
        }
        catch (...)
        {
            cout << "Enter valid string" << endl;
        }
    }

    root = insert(root, keyword, meaning);
    return root;
};

void inorder(Node *root)
{
    if (root != NULL)
    {
        inorder(root->left);
        
        cout << root->keyword << " : " << root->meaning << endl;
        inorder(root->right);
    }
}

void reverseorder(Node *root)
{
    if (root != NULL)
    {
        reverseorder(root->right);
        cout << root->keyword << " : " << root->meaning << endl;
        reverseorder(root->left);
    }
}

Node *searc(Node *root, string keyword)
{
    count+=1;
    if (root == NULL || root->keyword == keyword)
    {
        return root;
    }
    if (root->keyword < keyword)
    {
        return searc(root->right, keyword);
    }
    else
    {
    return searc(root->left, keyword);
    }
};

Node *s(Node *root)
{
    string search;
    bool x = true;
    while (x)
    {
        try
        {
            
        cout << "Enter Search element : ";
        cin >> search;    

        if (correct(search))
        {
            x = false;
        }
        else
        {
            throw 1;
        }
        }
        catch(...)
        {
            cout<<"Enter valid string"<<endl;
        }
        
    }
    Node *a;
    a= searc(root,search);
    return a;
}

void update(Node *root,string keyword,string up_meaning)
{
    Node *a;
    a=searc(root,keyword);
    if(a)
    {
        a->meaning=up_meaning;
        return;
        }
        else
        {
        cout<<"No element present"<<endl;
        return;
        }
}

int main()
{
    Node *root = NULL;
    Node *a;
    int ch;
    string up_keyword;
    do
    {
        cout << "MENU" << endl;
        cout << "1. Insert" << endl;
        cout << "2. Print in ascending order" << endl;
        cout << "3. Print in descending order" << endl;
        cout << "4. Search" << endl;
        cout<<"5.Update"<<endl;
        cout << "-1. Exit" << endl;
        cout << "Enter operation to be performed : ";
        cin >> ch;
        switch (ch)
        {
        case 1:
            root = create(root);
            break;
        case 2:
            if (root == NULL)
            {
                cout<<"**********************"<<endl;
                cout << "Tree is empty"<<endl;
                cout<<"**********************"<<endl;
            }else
            {
            cout<<"**********************"<<endl;
                inorder(root);
                cout<<"**********************"<<endl;
            }break;
        case 3:
            if (root == NULL)
            {cout<<"**********************"<<endl;
                cout << "Tree is empty"<<endl;
                cout<<"**********************"<<endl;
            }else
            {cout<<"**********************"<<endl;
                reverseorder(root);
                cout<<"**********************"<<endl;
            }break;
        case 4:
            if (root == NULL)
            {
            cout<<"**********************"<<endl;
                cout << "Tree is empty"<<endl;
                cout<<"**********************"<<endl;
            }else
            {
            a = s(root);
            if (a)
            {
                cout<<"**********************"<<endl;
                cout << "Found "<<endl;
                cout<< a->keyword<<" : "<<a->meaning<<endl;
                cout<<count<<endl;
                count=0;
            cout<<"**********************"<<endl;
            }
            else
            {
                cout<<"**********************"<<endl;
                cout << "Not found "<<endl;
                cout<<count<<endl;
                count=0;
                cout<<"**********************"<<endl;
            }
            }
            break;
        case 5:
        string keyword,up_meaning;
        cout<<"Original string : ";
        cin>>keyword;
        cout<<endl;
        cout<<"New meaning : ";
        cin>>up_meaning;
        update(root,keyword,up_meaning);
        break;
    }} while (ch != -1);
    cout << "Thank You";
    return 0;
}