Exemplo n.º 1
0
void printList(List& source, bool direction) {
  // if (source.size() > 0) {
  if (direction) {
    ListItr iter = source.first();
    for (int n=0; n<source.size(); n++) {
      cout << iter.retrieve() << endl;
      iter.moveForward();
    }
  }
  
  else {
    ListItr iter = source.last();
    for (int n=0; n<source.size(); n++) {
      cout << iter.retrieve() << endl;
      iter.moveBackward();
    }
  } 
  // }
  //else {
  //cout << "The list is empty" << endl;
  //}
} 
Exemplo n.º 2
0
int   main ()
/*
**  This main driver program interactively exercises a
**   list package.
**  It assumes a linked list implementation, and its real
**   purpose is to exercise the underlying list manipulation
**   procedures.
**  It uses a menu to accept commands from the terminal,
**   then performs the indicated command.
*/
{
    int      command;
    string   response;
    List     *list = NULL;
    ListItr  *itr = NULL;
    // Initialize this run
    cout << "--------------------------------------------------\n";
    cout << "\tThis test harness operates with one List\n"
         << "\tobject and one ListItr object.\n\n"
         << "\tUse the menu options to manipulate these\n"
         << "\tobjects.\n";

    while (1) {
        command = menu(option, n_choice);

        switch (command) {
            case 1:                        // Quit
                cout << "\tDo you really want to quit? (y/n) > ";
                cin  >> response;

                if (response[0] == 'y' || response[0] == 'Y') {                 // Normal Exit
                    return 0;
                }

                break;

            case 2:                        // New list
                if (list != NULL) delete list;
                list = new List;

                cout << "\tYou have created an empty list\n";
                cout << "\tDo you want to initialize it with elements? (y/n) > ";
                cin  >> response;

                if (response[0] != 'y' && response[0] != 'Y')
                    break;
                // accept elements
                cout << "\t\tEnter elements one by one as integers.\n";
                cout << "\t\tAny non-numeric character, e.g. #, ";
                cout << "will terminate input\n";

                cout << "\tEnter first element: ";
                cin >> response;

                while (isdigit(response[0])) {
                    int element = atoi(response.c_str());
                    list->insertAtTail(element);

                    cout << "\tEnter next element: ";
                    cin >> response;
                }

                cout << endl << "The elements in forward order: " << endl;
                printList(*list, true);
                break;

            case 3:                      // show elements
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }
                cout << "\tPrint the list forwards or backwards? (f/b) > ";
                cin  >> response;

                if (response[0] == 'b' || response[0] == 'B') {
                    cout << endl << "The elements in reverse order:" << endl;
                    printList(*list, false);
                } else {
                    cout << endl << "The elements in forward order:" << endl;
                    printList(*list, true);
                }
                break;

            case 4:                      // test first()
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }
                cout << "\tSetting the ListItr to the first element..." << endl;
                itr = new ListItr((list->first()));
                break;

            case 5:                      // test find()
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }
                cout << "\tEnter element to find: ";
                cin >> response;

                if (isdigit(response[0])) {
                    int element = atoi(response.c_str());
                    itr = new ListItr((list->find(element)));
                    cout << "\tSetting the ListItr to find("
                         << element << ")..." << endl;
                } else {
                    cout << "\tPlease enter an integer." << endl;
                }
                break;

            case 6:                      // test last()
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                }
                cout << "\tSetting the ListItr to the last element..." << endl;
                itr = new ListItr((list->last()));
                break;

            case 7:                      // test moveForwards()
                if (itr == NULL) {
                    cout << endl << "\tCreate a ListItr first." << endl;
                    break;
                }
                cout << "\tMoving the ListItr forwards..." << endl;
                itr->moveForward();
                break;

            case 8:                      // test move_backwards()
                if (itr == NULL) {
                    cout << endl << "\tCreate a ListItr first." << endl;
                    break;
                }
                cout << "\tMoving the ListItr backwards..." << endl;
                itr->moveBackward();
                break;

            case 9:                      // test retrieve()
                if (itr == NULL) {
                    cout << endl << "\tCreate a ListItr first." << endl;
                    break;
                }

                if (itr->isPastBeginning())
                    cout << "\tThe ListItr is past the beginning." << endl;
                else if (itr->isPastEnd())
                    cout << "\tThe ListItr is past the end." << endl;
                else
                    cout << "\tElement retrieved: " << itr->retrieve() << endl;
                break;

            case 10:                        // Insert element before
                if (list == NULL || itr == NULL) {
                    cout << endl << "\tCreate a List and ListItr first." << endl;
                    break;
                }

                cout << "\tEnter element to insert: ";
                cin >> response;

                if (isdigit(response[0])) {
                    int element = atoi(response.c_str());
                    list->insertBefore(element, *itr);
                    cout << "\tInserting " << element
                         << " before the current ListItr" <<endl;
                } else {
                    cout << "\tPlease enter an integer." << endl;
                    break;
                }

                cout << endl << "The elements in forward order: " << endl;
                printList(*list, true);
                break;

            case 11:                        // Insert element after
                if (list == NULL || itr == NULL) {
                    cout << endl << "\tCreate a List and ListItr first." << endl;
                    break;
                }

                cout << "\tEnter element to insert: ";
                cin >> response;

                if (isdigit(response[0])) {
                    int element = atoi(response.c_str());
                    list->insertAfter(element, *itr);
                    cout << "\tInserting " << element
                         << " after the current ListItr" <<endl;
                } else {
                    cout << "\tPlease enter an integer." << endl;
                    break;
                }

                cout << endl << "The elements in forward order: " << endl;
                printList(*list, true);
                break;

            case 12:                        // Insert element at tail
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }

                cout << "\tEnter element to insert: ";
                cin >> response;

                if (isdigit(response[0])) {
                    int element = atoi(response.c_str());
                    list->insertAtTail(element);
                    cout << "\tInserting " << element
                         << " at the tail of the list" <<endl;
                } else {
                    cout << "\tPlease enter an integer." << endl;
                    break;
                }

                cout << endl << "The elements in forward order: " << endl;
                printList(*list, true);
                break;

            case 13:                        // Remove element
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }

                cout << "\tEnter element to remove: ";
                cin >> response;

                if (isdigit(response[0])) {
                    int element = atoi(response.c_str());
                    list->remove(element);
                    cout << "\tRemoving " << element
                         << " from list" <<endl;
                } else {
                    cout << "\tPlease enter an integer." << endl;
                    break;
                }

                cout << endl << "The elements in forward order: " << endl;
                printList(*list, true);
                break;

            case 14:                      // test size()
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }

                cout << "\tSize of list: " << list->size() << endl;
                break;

            case 15: {                    // test copy constructor
                List* old_list=list;
                list=new List(*old_list);
                old_list->makeEmpty();

                cout << "The new list is (forward ): " ;
                printList(*list, true);
                cout << "The new list is (backward): " ;
                printList(*list, false);
                cout << "The old list was made empty (forward ): ";
                printList(*old_list, true);
                cout << "The old list was made empty (backward): ";
                printList(*old_list, false);
                cout << "The old list should be destroyed now." << endl;
                delete old_list;
                break;
            }
            case 16: {                    // test equals operator
                List* old_list=list;
                list=new List();
                *list=*old_list;
                old_list->makeEmpty();

                cout << "The new list is (forward ): " ;
                printList(*list,true);
                cout << "The new list is (backward): " ;
                printList(*list,false);
                cout << "The old list was made empty (forward ): " ;
                printList(*old_list,true);
                cout << "The old list was made empty (backward): " ;
                printList(*old_list,false);
                cout << "The old list should be destroyed now." << endl;

                delete old_list;
                break;
            }

            case 17:                      // test makeEmpty()
                if (list == NULL) {
                    cout << endl << "\tCreate a List first." << endl;
                    break;
                }

                cout << "The list is (forward ): " ;
                printList(*list,true);
                cout << "The list is (backward): " ;
                printList(*list,false);
                list->makeEmpty();
                cout << "The list was made empty (forward ): " ;
                printList(*list,true);
                cout << "The list was made empty (backward): " ;
                printList(*list,false);
        }               // end of switch (command)
    }            // end of while (1)
}     // end of main()