How to deal with an array of strings in c, c++?

Question

C++ / C#

bool in_list(char *l1[],char *l2,int kolvo) {
      int i;
      for (i = 0; i < kolvo; i++) {
        if (strcmp(l1[i], l2) == 0) {
          return true;
        }
      }
      return false;
    }
int func(){
                FILE *f;
    int nom;
    char gr[8];
    char fam[12];
    int oc[3];;
    int k=0,i;
    char *f_n;
    char  *grps[] = {""};

    f_n = (char*)(void*)Marshal::StringToHGlobalAnsi(openFile1->FileName->ToString());
    f = fopen(f_n, "r");
    while (fscanf(f,"%d",&nom)!=EOF) {
      fscanf(f, "%s%s", gr,fam);
      for (i = 0; i < 3; i++) fscanf(f, "%d", &oc[i]);
      if (!(in_list(grps, gr, k))) {
        grps[k] = new char[8];
        strcpy(grps[k],gr);
        k++;
        String ^p = gcnew String(gr);
        this->comboBox1->Items->Add(p);

      }
      String^ st = gcnew String("");
      String ^q = gcnew String(gr);
      String ^p = gcnew String(fam);
      st = st + nom;
      if (st->Length == 1)
        st = " " + st;
      st = st + "  " + q + "  " + p + "  " + oc[0] + "  " + oc[1]
        + "  " + oc[2] + "\n";
      this->richTextBox1->AppendText(st);

    }
    fclose(f);
    //f = fopen(f_n, "r");
    //fclose(f);
  }
  else
    MessageBox::Show("Ошибка открытия файла");
  flag = 0;
}

It is necessary to make sure that all gr are collected in grps, moreover, once each, create a list of groups.
But it turns out that only the first gr is stored in grps, and subsequent ones are not recorded.

Answer 1

char *grps[] = {""};
But it turns out that only the first gr is stored in grps, and the subsequent ones are not written.

Do you understand that you have a single element in the grps array, and the recording of all elements after the first one goes past this array, somewhere on the stack, spoiling other data?

grps[k] = new char[8];
...
String^ st = gcnew String("");

And if your question is not about C, then correct the tags.

Answer 2

Use andstd::stringstd::vector