LL Help (C++) Main Programs

//MAIN 1

int main() {

   LL ll1;
   cout << "length of empty list - " << ll1.list_length() << endl;
   ll1.display_list();
   ll1.push_front("aaaaa");
   ll1.push_back("bbbbb");
   ll1.push_front("before aaaaa");
   ll1.push_back("after bbbbb");
   cout << "length of list after 4 pushes - " << ll1.list_length() << endl;
   ll1.display_list();
   cout << endl;

   LL ll2;
   ll2.push_front("33333");
   ll2.push_front("22222");
   ll2.push_front("11111");
   ll2.push_back("44444");
   ll2.push_back("55555");
   ll2.push_back("66666");
   ll2.display_list();

   return 0;
}

//MAIN 2

int main() {

   LL ll1;
   cout << "main: length of empty list - " << ll1.list_length() << endl;
   cout << "main: trying to display empty list 1" << endl;
   ll1.display_list();
   cout << "main: trying to display initial size of ll1 - " << ll1.list_length() << endl;
   ll1.push_front("aaaaa");
   ll1.push_back("bbbbb");
   ll1.push_front("before aaaaa");
   ll1.push_back("after bbbbb");
   cout << "main: length of ll1 after 4 pushes - " << ll1.list_length() << endl;
   cout << "main: now trying to display ll1 after 4 push's" << endl;
   ll1.display_list();
   cout << "main: displaying final size of ll1 - " << ll1.list_length() << endl;
   cout << endl;

   LL ll2;
   ll2.push_front("33333");
   ll2.push_front("22222");
   ll2.push_front("11111");
   ll2.push_back("44444");
   ll2.push_back("55555");
   ll2.push_back("66666");
   cout << "main: now trying to display ll2 after 6 push's" << endl;
   ll2.display_list();

   return 0;
}

//MAIN 3

int main() {

   LL ll1;
   cout << "main: length of empty list - " << ll1.list_length() << endl;
   cout << "main: trying to display empty list 1" << endl;
   ll1.display_list();
   cout << "main: trying to display initial size of ll1 - " << ll1.list_length() << endl;
   ll1.push_front("aaaaa");
   ll1.push_back("bbbbb");
   ll1.push_front("before aaaaa");
   ll1.push_back("after bbbbb");
   cout << "main: length of ll1 after 4 pushes - " << ll1.list_length() << endl;
   cout << "main: now trying to display ll1 after 4 push's" << endl;
   ll1.display_list();
   cout << "main: displaying final size of ll1 - " << ll1.list_length() << endl;
   ll1.destroy_list();
   cout << "main: displaying size of list 1 after destroy - " << ll1.list_length() << endl;
   cout << endl;

   LL ll2;

   ll2.push_front("33333");
   ll2.push_front("22222");
   ll2.push_front("11111");
   ll2.push_back("44444");
   ll2.push_back("55555");
   ll2.push_back("66666");
   cout << "main: now trying to display ll2 after 6 push's" << endl;
   ll2.display_list();
   cout << "main: now searching for node 44444" << endl;
   if (ll2.search_list("44444"))
   {
       cout <<"main: found node 44444" << endl;
   }
   else
   {
       cout << "main: did not find node 44444" << endl;
   }
   cout << "main: now searching for node 44445" << endl;
   if (ll2.search_list("44445"))
   {
       cout <<"main: found node 44445" << endl;
   }
   else
   {
       cout << "main: did not find node 44445" << endl;
   }
   cout << "main: now trying to delete node 44444" << endl;
   if (ll2.delete_node("44444"))
   {
       cout <<"main: node 44444 deleted" << endl;
   }
   else
   {
       cout << "main: did not find 44444 for delete" << endl;
   }
   if (ll2.search_list("44444"))
   {
       cout <<"main: searched for 44444 after delete, found" << endl;
   }
   else
   {
       cout << "main: searched for 44444 after delete, not found" << endl;
   }
   cout << "main: displaying whole list after delete 44444" << endl;
   ll2.display_list();
   cout << "main: now trying to delete node 11111" << endl;
   if (ll2.delete_node("11111"))
   {
       cout <<"main: node 11111 deleted" << endl;
   }
   else
   {
       cout << "main: did not find node 11111 for delete" << endl;
   }
   cout << "main displaying whole list after delete 11111" << endl;
   ll2.display_list();
   ll2.destroy_list();

   return 0;
}