вопрос

#include <iostream>
#include <fstream>

using namespace std;

const int sizeRating = 5;
char filePath[100];
bool firstRun = true;
int option;

struct Stud
{
    char name[20];
    int groupId;
    int rating[sizeRating];
};

void menu (Stud* groupMenu, int &sizeGroup);
void create(Stud* groupCreate, int &sizeGroup);
void add(Stud* groupWrite, int &sizeGroup);
void read(Stud* groupRead, int &sizeGroup);

int main ()
{
    int sizeGroup = 2;
    Stud* group = new Stud[sizeGroup];

    cout << "1. Create new database" << endl;
    cout << "2. Complete existing" << endl;
    cout << "3. Read existing" << endl;

    cout << endl;
    while (option <= 0 || option > 3)
    {
        cout << "Select an action 1 - 3: ";
        cin >> option;
    }

    menu(group, sizeGroup);

    return 0;
}

void menu (Stud* groupMenu, int &sizeGroup)
{
    if (!firstRun)
    {
        option = 0;
        cout << "1. Create another database" << endl;
        cout << "2. Complete existing" << endl;
        cout << "3. Read existing" << endl;
        cout << "4. Exit" << endl;
    }

    cout << endl;
    while (option <= 0 || option > 4)
    {
        cout << "Select an action 1 - 4: ";
        cin >> option;
    }

    switch (option)
    {
    case 1:
        create(groupMenu, sizeGroup);
        break;
    case 2:
        add(groupMenu, sizeGroup);
        break;
    case 3:
        read(groupMenu, sizeGroup);
        break;
    case 4:
        break;
    }
}

void create(Stud* groupCreate, int &sizeGroup)
{
    cout << endl;
    cout << "Specify a destination and filename:" << endl;
    cin >> filePath;
    cout << "Students to create: ";
    cin >> sizeGroup;

    FILE* fileCreate = fopen(filePath, "w+b");

    cout << endl;
    for (int i = 0; i < sizeGroup; i++)
    {
        cout << "Student " << i + 1 << endl;
        cout << "Name: ";
        cin >> groupCreate[i].name;
        cout << "Group Id: ";
        cin >> groupCreate[i].groupId;
        cout << "Rating: " << endl;
        for (int j = 0; j < sizeRating; j++)
        {
            cout << j + 1 << ". ";
            cin >> groupCreate[i].rating[j];
        }
        cout << endl;

    }

    fwrite(groupCreate, sizeof(Stud), sizeGroup, fileCreate);

    fclose(fileCreate);
    firstRun = false;
    menu(groupCreate, sizeGroup);
}

void add(Stud* groupWrite, int &sizeGroup)
{
    int addStud = 0;

    cout << endl;
    cout << "Specify a destination and filename:" << endl;
    cin >> filePath;
    cout << "Students to add: ";
    cin >> addStud;

    FILE* fileAdd = fopen(filePath, "a+b");

    cout << endl;
    for (int i = 0; i < addStud; i++)
    {
        cout << "Student " << i + 1 << endl;
        cout << "Name: ";
        cin >> groupWrite[i].name;
        cout << "Group Id: ";
        cin >> groupWrite[i].groupId;
        cout << "Rating: " << endl;
        for (int j = 0; j < sizeRating; j++)
        {
            cout << j + 1 << ". ";
            cin >> groupWrite[i].rating[j];
        }
        cout << endl;
    }

    fwrite(groupWrite, sizeof(Stud), addStud, fileAdd);

    fclose(fileAdd);
    firstRun = false;
    menu(groupWrite, sizeGroup);
}

void read(Stud* groupRead, int &sizeGroup)
{
    cout << endl;
    cout << "Specify a destination and filename:" << endl;
    cin >> filePath;

    FILE* fileRead = fopen(filePath, "r+b");
    int i = 0;
    while (fread(&groupRead[i], sizeof(Stud), 1, fileRead))
    {
        cout << endl;
        cout << "Student: " << i + 1 << endl;
        cout << "Name: "<< groupRead[i].name << endl;
        cout << "Group ID: " << groupRead[i].groupId << endl;
        cout << "Rating: ";
        for (int j = 0; j < sizeRating; j++)
        {
            cout << groupRead[i].rating[j] << " ";
        }
        cout << endl;
        i++;
    }
    cout << endl;

    fclose(fileRead);
    firstRun = false;
    menu(groupRead, sizeGroup);
}