Dictionary using linklist in cpp

#include <iostream>
#include <fstream>
#include <bits/stdc++.h>
#include <string>
using namespace std;


/////////////////STUCTURE OF LINK LIST////////////////////////////
class node
{
    public:
        string word; //word to be inserted or searched
        string mean;//meaning of word to be inserted or searched
        node* next;//next pointer
        node* prev;// previous pointer

};
///////////////ADDING WORD TO LINK LIST AT LAST/////////////////////////
void add_to_dictionary(node* &head,node* &tail)
{
    string word1;
    string mean1;
    cout<<"ALERT! Use '/_'/ For Spaces"<<endl;
    cout<<"Enter Your Word"<<endl;
    cin>>word1;
    cout<<"Enter  The Meaning Of Your Word"<<endl;
    cin>>mean1;
    ///////CREATING A NEW NODE//////
    node* temp=head;
    node* new_node=new node;
    new_node->word=word1;
    new_node->mean=mean1;
    new_node->next=NULL;
    new_node->prev=NULL;
    if(head==NULL)
    {
        head=new_node;
        tail=new_node;
    }
    else
    {
        while(temp->next!=NULL)
        {
            temp=temp->next;
        }
        temp->next=new_node;
        new_node->prev=temp;
        tail=new_node;
    }
}
///////////////////////ADDING WORD AT TOP///////////////////////
void add_at_top(node* &head ,node* &tail)
{
     string word5;
    string mean5;
    cout<<"ALERT! Use '_'For Spaces"<<endl;
    cout<<"Enter Your Word"<<endl;
    cin>>word5;
    cout<<"Enter  The Meaning Of Your Word"<<endl;
    cin>>mean5;
     ///////CREATING A NEW NODE//////
    node* temp=head;
    node* new_node=new node;
    new_node->word=word5;
    new_node->mean=mean5;
    new_node->next=head;
    new_node->prev=NULL;
     if(head!=NULL)
        {
        head->prev=new_node;
        }
    new_node->prev=NULL;
    head=new_node;


}
////////////////////////TO SEARCH IN DICTIONARY/////////////////
void search_in_dictionary(node*&head,node* &tail)
{
    node*temp = NULL;
    int flag =1;
    string word2;
    cout<<"Enter The Word You Want To Search"<<endl;
    cin>>word2;
    while(temp->next!=NULL)
    {
        if(temp->word==word2)
        {
             cout<<"Oh Yeah We Got Your Word"<<endl;
             cout<<temp->word<<"---"<<temp->mean<<endl;
             flag = 0;
             break;
        }

        temp=temp->next;


    }
    if (flag==1)
    {
    cout<<"Oops We Were Not Able TO Find!"<<endl;
    }
}
///////////////////////DELETE WORD////////////////////////////
void delete_word(node* &head, node* &tail)
{
    node* temp= head;
    string word4;
    cout<<"Enter A Word You Want To Delete"<<endl;
    cin>>word4;
    ////////WHEN WORD IS PRESENT AT FRONT//////
    if(head->word==word4)
    {
        node*del_h=head;
        head=head->next;
        head->next->prev=NULL;
        delete del_h;
        return;
    }
    ////////WHEN WORD IS PRESENT AT END//////
    else if(tail->word==word4)
    {
        node*del_last=tail;
        node* store1=tail->prev;
        tail->prev->next=NULL;
        tail=store1;
        delete del_last;
    }
    while(temp->next->word!=word4)
    {
        temp=temp->next;
    }
    node* store = temp;
    node* to_del=temp->next;
    temp->next=temp->next->next;
    temp->next->next->prev=store;
    delete to_del;
}
////////////////////SHOW DICTIONARY//////////////////////////
void show_dictionary(node* &head,node* &tail)
{
    node* temp=head;
    cout<<"Displaying Dictionary :"<<endl;
    while(temp!=NULL)
    {
        cout<<temp->word<<"---"<<temp->mean<<endl;
        temp=temp->next;
    }
}



int main()
{
    ////////////////CODE RELATED FOR MAKING OF FILE////////////
   // ofstream of_f;
  //  ifstream if_f;
  //  fstream f_f;


   /* of_f.open("DICTIONARY.txt");
    of_f<<"\nthis is my first text file\n";
    of_f.close();*/

    //////////////////////////END////////////////////////////////////
    node*head=NULL;
    node*tail=NULL;

    ////////////////////MENU FOR DICTIONARY/////////////////////
    int ch;
    while(1)
    {
       // clrscr( ) ;
        cout<< "\n\t\tDictionary"<<endl ;
        cout<<"\n\t\t 1.Add A Word At Last." <<endl;
        cout<<"\t\t 2.Search A Word."<<endl ;
        cout<<"\t\t 3.Show Dictionary."<<endl ;
        cout<<"\t\t 4.Delete A Word"<<endl;
        cout<<"\n\t\t 5.Add A Word At Top." <<endl;
        cout<<"\t\t 0.Exit."<<endl;
        cout<< "\n\n\t\t Your Choice From 0 1 2 3"<<endl; ;
       cin>>ch;
       switch(ch)
       {
        case 1:
           add_to_dictionary(head,tail);
           break;
       case 2 :
            search_in_dictionary(head,tail);
           break;
       case 3 :
            show_dictionary(head,tail);
           break;
       case 4 :
           delete_word(head,tail);
           break;
       case 5:
           add_at_top(head,tail);
        break;
        case 0:
           break;
       default:
        cout<<"Wrong CHOICE Buddy!"<<endl;
        break;
        }
        if(ch == 0)
        {
            cout<<"Thanks For Using Dictionary!"<<endl;
            break;
        }
    }
/////////////////////////////////MENU END//////////////////////

    return 0;
}