video linked list creating cerr commands

[n30n]

How do i make my code works so that if i insert a list of video and then try to insert another list with the exact same title, it prompts some cerr message to say i have already entered the same title?

the lookup command has the cerr message that works exactly fine as I want


this is what i have

main.cpp 

31   while (getline(cin, command))
 32   {
 33 
 34     if(command=="insert")
 35     {
 36 
 37       getline(cin, title);
 38       getline(cin, url);
 39       getline(cin, comment);
 40       cin >> length;
 41       cin >> rating;
 42       cin.ignore();
 43 
 44       myVideo = new Video(title, url, comment, length,rating);
 45 
 46       list.insert(myVideo);
 47       // list.print();
 48       counter++;
 49 
 50      if(list.lookup(title)->get_title() == myVideo->get_title())
 51       {
 52 
 53         cerr << "Title is already in the list" << endl;
 54       }
 55     }



 83     else if(command == "lookup")
 84     {
 85       getline(cin, title);
 86       Video *myVideo = list.lookup(title);
 87 
 88       if(myVideo!=NULL)
 89       {
 90         myVideo->print();
 91       }
 92       else
 93       {
 94         cerr << "Title" << " " << "<" << title << ">" << " " << "is not in list." <<endl;
 95       }
 96 
 97     }
 98 

videolist.cpp


 27 bool Vlist::insert(Video *video)
 28 {
 29   if(m_head==NULL)
 30   {
 31     m_head=new Node(video, NULL);
 32     return true;
 33   }
 34 

 39   if(m_head->m_video->get_title() >= video->get_title())
 40   {
 41     if(m_head->m_video->get_title() == video->get_title())
 42     {
 43 
 44       return false;
 45     }
 46 
 47     m_head=new Node(video, m_head);
 48     return true;
 49   }
 50 
 51   Node *ptr=m_head;
 52   while( (ptr->m_next!=NULL) && ( video->get_title()>ptr->m_video->get_title() ) )
 53     //checking if first title is bigger than last
 54   {
 55     if(( video->get_title() == ptr-> m_video->get_title() ) )
 56     {
 57       //error if same title
 58       return false;
 59     }
 60     ptr=ptr->m_next;
 61   }
 62   ptr->m_next=new Node(video, ptr->m_next);
 63 
 64   return true;
 65 }


 86 Video* Vlist::lookup(string title)
 87 {
 88   Node *ptr = m_head;
 89 
 90   while(ptr!=NULL)
 91   {
 92     if(title == ptr->m_video->get_title())
 93       return ptr->m_video;
 94     ptr = ptr->m_next;
 95   }
 96 
 97   return NULL;
 98 }
 99 

[Zhuge]

I'm not really sure what the issue actually is, but perhaps you only want to insert into the list after you've done the lookup and noted the video doesn't already exist?