Траблы с указателями

struct Enterprisiz
{
    char secondName[20];
    char firstName[20];
    char therdName[20];
    int earOfBirthday;
    char gender[20];
    char sityOfBirthday[20];
    char workPothison[20];
    int selary;
    Enterprisiz *adr, *previousPointer;
    Enterprisiz() {
        adr = NULL;
        previousPointer = NULL;
    }
 
};
 
Enterprisiz *first, *top, *nextPointer;

Enterprisiz* searchElementOfQueue(Enterprisiz *nextPointer, int number) {
 
 
    int siz = -1;
    
    nextPointer = first;
 
    do {
 
        if (nextPointer->adr == NULL) break;
        nextPointer = nextPointer->adr;
        siz++;
    } while (siz!=number);
 
 
    return nextPointer;
}

void correctOfData(Enterprisiz* nextPointer) {
 
    
    int number;
    char fild[20];
    char yesNo;
 
 
    do {
 
        do {
            cout << "Enter number of people of which you want changing whis interval 0 to " << sizeQueue(nextPointer) << " ->";
            cin >> number;
            cout << endl << endl;
            if ((number > sizeQueue(nextPointer)) || (number < 0))system("cls");
        } while ((number > sizeQueue(nextPointer)) || (number < 0));
 
        system("cls");
 
        nextPointer = searchElementOfQueue(nextPointer ,number);
 
        do {
            cout << "Number of people of which you want changingwhis interval 0 to " << sizeQueue(nextPointer) << " -> " << number << endl;
            cout << endl << endl;
            cout << "Enter name of struct field of which you want correkt-> ";
            cin >> fild;
            cout << endl << endl;
 
 
 
 
 
            if (!strcmp(fild, "secondName")) {
                cout << "second NAME-> ";
                cin >> nextPointer->secondName;
            }
 
            if (!strcmp(fild, "firstName")) {
                cout << "first NAME-> ";
                cin >> nextPointer->firstName;
            }
 
            if (!strcmp(fild, "therdName")) {
                cout << "therd NAME-> ";
                cin >> nextPointer->therdName;
            }
 
            if (!strcmp(fild, "earOfBirthday")) {
                cout << "ear of Birthday-> ";
                cin >> nextPointer->earOfBirthday;
            }
 
            if (!strcmp(fild, "gender")) {
                cout << "gender-> ";
                cin >> nextPointer->gender;
            }
 
            if (!strcmp(fild, "sityOfBirthday")) {
                cout << "sity of Birthday-> ";
                cin >> nextPointer->sityOfBirthday;
            }
 
            if (!strcmp(fild, "workPothison")) {
                cout << "work Pothison-> ";
                cin >> nextPointer->workPothison;
            }
 
            if (!strcmp(fild, "selary")) {
                cout << "selary-> ";
                cin >> nextPointer->selary;
            }
 
            cout << "If you end correct FILD of " << number << " people list pres -y- if you want changing somthing else in this list press -n- -> ";
            cin >> yesNo;
 
            if (yesNo == 'y') {
                system("cls");
                break;
            }
 
        } while (1);
 
        cout << "If you end correct STRUCT pres -y- if you want changing some STRUCT press -n- -> ";
        cin >> yesNo;
 
        if (yesNo == 'y') {
            system("cls");
            break;
        }
    } while (1);
}