C++ Program Code To Implement Singly Linked List Using Template Class

/* The Following C++ code is tested in MS Visual Studio 2010. The Given code simulates the concept of Singly linked list utilizing the concept of Template Class, First it asks the user to create a list, then after the user enters a '0', it displays other options of the list to process it further */

#include<iostream>

using namespace std;

#include<conio.h>

template<class T>

class node

{

     public:

              T data;

              node<T> *link;

};

template<class T>

class list

{

      private:

              node<T> *first;

      public:

      list();

      ~list();

      void createlist();

      void deletion();

      void insertion();

      void display();
     
      };

template<class T>

list<T>::list()

{

               first=NULL;

}

template<class T>

list<T>::~list()

{

                node<T> *next;

                while(first)

                {

                            next=first->link;

                            delete first;

                            first=next;

                }

}

template<class T>

void list<T>::createlist()

{

                     T a;
                    
                     node<T> *cur,*ptr;

                     cout<<"\nEnter data Of New Node (Enter 0 To Have other options):";

                     cin>>a;

                     while(a)

                     {

                             cur=new node<T>;

                             cur->data=a;

                             cur->link=NULL;

                             if(first==NULL)

                             first=cur;

                             else

                             ptr->link=cur;

                             ptr=cur;

                             cout<<"\nEnter data Of New Node (Enter 0 To Have other options):";

                             cin>>a;

                     }

}

template<class T>

void list<T>::insertion()

{
                node<T> *cur,*ptr;

                 T ele;
                  
                 char ch;
         
                 ptr=first;

                 cur=new node<T>;

                 cout<<"\nEnter data Of New Node:";

                 cin>>cur->data;

                 cur->link=NULL;

                 cout<<"\n Do u wish to insert at the start [y/n]:";

                 cin>>ch;

                 if(ch=='Y'||ch=='y')

                 {

                                     cur->link=first;

                                     first=cur;

                 }

                 else

                 {

                     cout<<"\n Specify after which element do u want to insert :";

                     cin>>ele;

                     while(ptr!=NULL)

                     {

                                     if(ptr->data==ele)

                                     {

                                                      cur->link=ptr->link;

                                                      ptr->link=cur;

                                                      break;

                                     }

                                     else

                                     {

                                         ptr=ptr->link;

                                     }

                     }

                 }

}

template<class T>

void list<T>::deletion()

{

                 T ele;

                 char ch;

                 node<T> *ptr,*ptr1;

                 if(first==NULL)

                 {

                                cout<<"\nSorry list is empty.";

                 }

                 else
                
                 {

                     ptr=first;

                     cout<<"\nDo u want to delete first element? [y/n]:";

                     cin>>ch;

                     if(ch=='y'||ch=='Y')

                     {

                                         first=first->link;

                                         delete ptr;

                     }

                     else

                     {

                         cout<<"\nSpecify which element do u want to delete :";

                         cin>>ele;

                         while(ptr!=NULL)

                         {

                                         if(ptr->link->data==ele)

                                         {

                                                                 ptr1=ptr->link;

                                                                 ptr->link=ptr1->link;

                                                                 delete ptr1;
                                                                
                                                                 return;

                                         }
                                       
                                        else

                                         {

                                             ptr=ptr->link;

                                         }

                         }

                     }

                 }

}

template<class T>

void list<T>::display()

{

     node<T> *ptr;

     if(first==NULL)

     {

                    cout<<"\n Sorry list is empty..";

     }

     else

     {

         ptr=first;

         while(ptr!=NULL)

         {
                        
                         cout<<ptr->data<<"   ";

                         ptr=ptr->link;

         }

     }

}

int main()

{

    int n;

    list <int> l;

    l.createlist();

    do

    {

                   cout<<"\n 1.Insertion \n2.Deletion \n3.Print List \n4.Exit \n";

                   cout<<"\n Enter your option : ";

                   cin>>n;

                   switch(n)

                   {

                            case 1: l.insertion();

                            break;

                            case 2: l.deletion();

                            break;

                            case 3: l.display();

                            break;

                            case 4:
                                 exit(0);

                            break;

                   }

    }while(n<=4);
   
    _getch();

    return 0;

}


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