Support_needed_regarding_failure_"doest not name a type"

Hello,

could you support me in the failures of this task, I have included also the actual failures in Word-Doc.

Thank you in advance,

Code:

---

/*######################################################
    Einsendeaufgabe 5.2
###################################################### */

/* ##################################
    Doppelt verkettete Liste
  ################################## */

#include <iostream>
using namespace std;

//Die Struktur für die Listenelemente
struct listenelement
    {
    string daten;
    listenelement* next;
    listenelement* last;
    };

listenelement* listenanfang;
listenelement* listenende;
listenelement* hilfszeiger;


//Eine Funktion zum Anhängen von Elementen an die Liste
void anhaengen(string datenneu)
    {
    hilfszeiger = listenanfang;
    while (hilfszeiger->next != nullptr)
          hilfszeiger = hilfszeiger->next;
    }

    hilfszeiger->next = new(listenelement);
    listenelement* bisherLetzter = hilfszeiger;
    hilfszeiger = hilfszeiger->next;

    strcpy(hilfszeiger->daten,datenneu);
    hilfszeiger->next = NULL;
    hilfszeiger->last = bisherLetzter;
    listenende = hilfszeiger;
}


//Eine Funktion zum Ausgeben aller Elemente
void ausgeben()
    {
    hilfszeiger = listenanfang;
    cout << hilfszeiger->daten << '\n';

    while (hilfszeiger->next != nullptr)
        {
        hilfszeiger = hilfszeiger->next;
        cout << hilfszeiger->daten << '\n';
        }
    }


void ausgaberueckwaerts() {

        hilfszeiger = listenende;

        cout <<hilfszeiger->daten<<"\n";

        while (hilfszeiger->last != NULL) {

        hilfszeiger = hilfszeiger->last;
        cout << hilfszeiger->daten << "\n";
        }

}

void initialisieren() {

        listenanfang = new(listenelement);
        listenanfang->next = NULL;
        listenanfang->last = NULL;
        listenende = listenanfang;
        strcpy(listenanfang->daten,"Element 0");
}

//die Liste leeren und Speicher freigeben
void ende()
    {
    while (listenanfang != nullptr)
        {
        hilfszeiger = listenanfang;
        listenanfang = listenanfang->next;
        delete(hilfszeiger);
        }
    }

int main ()
    {
    initialisieren();
    anhaengen("Element 1");
    anhaengen("Element 2");
    anhaengen("Element 3");
    ausgeben();
    ausgaberueckwaerts();
    ende();

    return 0;
    }

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When posting code, please use code tags so that code is readable. Go Advanced, select the formatted code and click '#'.

Also it isn't recommended that .doc file etc are attached as these could contain viruses etc. If you need to attach a file - as opposed to pasting the required text which is recommended - can I suggest just a plain .txt file.

Code:

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    while (hilfszeiger->next != nullptr)
          hilfszeiger = hilfszeiger->next;
    }

---

Shouldn't this be

Code:

---

    while (hilfszeiger->next != nullptr) {
          hilfszeiger = hilfszeiger->next;
    }

---

Also

Code:

---

strcpy(hilfszeiger->daten, datenneu);

---

as both are of type string, this should be

Code:

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hilfszeiger->daten = datenneu;

---

and similar for other like statements.

You also need a #include <string> as well.

You are also sometimes using NULL and sometimes using nullptr for when no valid pointer is specified. These should be nullptr not NULL.

Hello,

thank you very much for your quick answers, I corrected the code and it works.
Yes, I should just include the code in txt file or directly.

Thanks in advance,
cprogcoder

I am also an newcomer in C++ Programming. I think I would use this forum for further questions.

cprogcoder