Sashka:)

#include <iostream>
#include <string>
#include <fstream>
#include <Windows.h>

using namespace std;

struct Student {
    string name{};
    string surname{};
    string patronymic{};
    int number_group{};
    int birthYear{};
    int physics{};
    int math{};
    int informatics{};
    int chemistry{};
    double gap = (physics + math + informatics + chemistry) / 4.;
} spisok[5], student;
int n = 0;

void menu();
void add() {
    ofstream fout("File.txt", ios::app);
    string temp;
    int temp_int = 0;
    int middle = 0;
    cout << "Enter name : ";
    cin >> temp;
    fout << temp << " ";
    cout << "Enter surname : ";
    cin >> temp;
    fout << temp << " ";
    cout << "Enter patronymic : ";
    cin >> temp;
    fout << temp << " ";
    cout << "Enter number of group : ";
    cin >> temp_int;
    fout << temp_int << " ";
    cout << "Enter year of birth : ";
    cin >> temp_int;
    fout << temp_int << " ";
    cout << "Enter mark of physics : ";
    cin >> temp_int;
    middle += temp_int;
    fout << temp_int << " ";
    cout << "Enter mark of math : ";
    cin >> temp_int;
    middle += temp_int;
    fout << temp_int << " ";
    cout << "Enter mark of informatics : ";
    cin >> temp_int;
    middle += temp_int;
    fout << temp_int << " ";
    cout << "Enter mark of chemistry : ";
    cin >> temp_int;
    middle += temp_int;
    fout << temp_int << " ";
    fout << middle / 4.;
    fout << endl;
}

void show() {
    ifstream fin("File.txt", ios::in);
    string temp;
    int t = 0;
    double tt = 0;
    while (!fin.eof()) {
        fin >> temp;
        if (temp == "") break;
        cout<< "Name : " << temp << endl;
        fin >> temp;
        cout << "Surname : " << temp << endl;
        fin >> temp;
        cout << "Patronymic : " << temp << endl;
        fin >> t;
        cout << "Group : " << t << endl;
        fin >> t;
        cout << "Year of birth : " << t << endl;
        fin >> t;
        cout << "Physics : " << t << endl;
        fin >> t;
        cout << "Math : " << t << endl;
        fin >> t;
        cout << "Informatics : " << t << endl;
        fin >> t;
        cout << "Chemistry : " << t << endl;
        fin >> tt;
        cout << "Middle mark : " << tt << endl;
        temp = "";
        t = 0;
        tt = 0;
    }
}
void individual() {
    system("cls");
    ifstream fin("File.txt", ios::in);
    n = 0;
    while (!fin.eof()) {
        fin >> spisok[n].name;
        fin >> spisok[n].surname;
        fin >> spisok[n].patronymic;
        fin >> spisok[n].number_group;
        fin >> spisok[n].birthYear;
        fin >> spisok[n].physics;
        fin >> spisok[n].math;
        fin >> spisok[n].informatics;
        fin >> spisok[n].chemistry;
        fin >> spisok[n].gap;
        n++;
    }

    ofstream fout("File1.txt", ios::app);
    for (int i = 0; i < n; i++) {
        if (spisok[i].math >= 4 && spisok[i].informatics >= 4) {
            fout << endl;
            fout << spisok[i].surname << " ";
            cout << spisok[i].surname << endl;
            fout << spisok[i].name << " ";
            cout << spisok[i].name << endl;
            fout << spisok[i].patronymic << " ";
            cout << spisok[i].patronymic << endl;
            fout << spisok[i].number_group << " ";
            cout << spisok[i].number_group << endl;
            fout << spisok[i].birthYear << " ";
            cout << spisok[i].birthYear << endl;
            fout << spisok[i].physics << " ";
            cout << spisok[i].physics << endl;
            fout << spisok[i].math << " ";
            cout << spisok[i].math << endl;
            fout << spisok[i].informatics << " ";
            cout << spisok[i].informatics << endl;
            fout << spisok[i].chemistry << " ";
            cout << spisok[i].chemistry << endl;
            fout << spisok[i].gap;
            cout << spisok[i].gap << endl;
        }
    }
}
void edit() {
    system("cls");
    cout << "Vvedite nomer studenta korogo nuzhno izmenit: ";
    int num;
    cin >> num;
    num = num - 1;
    ifstream fin("File.txt", ios::in);
    n = 0;
    while (!fin.eof()) {
        fin >> spisok[n].name;
        if (spisok[n].name == "") break;
        fin >> spisok[n].surname;
        fin >> spisok[n].patronymic;
        fin >> spisok[n].number_group;
        fin >> spisok[n].birthYear;
        fin >> spisok[n].physics;
        fin >> spisok[n].math;
        fin >> spisok[n].informatics;
        fin >> spisok[n].chemistry;
        fin >> spisok[n].gap;
        n++;
    }
    cout << "Viberite chto vam nyzhno izmenit: " << endl;
    cout << "1 - Name" << endl;
    cout << "2 - Surname" << endl;
    cout << "3 - patronymic" << endl;
    cout << "4 - nember_group" << endl;
    cout << "5 - birthYear" << endl;
    cout << "6 - physics" << endl;
    cout << "7 - math" << endl;
    cout << "8 - informatics" << endl;
    cout << "9 - chemistry" << endl;
    int kl = 0;
    cin >> kl;
    system("cls");
    if (kl == 1) {
        cout << "Vvedite imya: ";
        string nam;
        cin >> nam;
        spisok[num].name = nam;
    }
    else
        if (kl == 2) {
            cout << "Vvedite famil: ";
            string nam;
            cin >> nam;
            spisok[num].surname = nam;
        }
        else
            if (kl == 3) {
                cout << "Vvedite otchestv: ";
                string nam;
                cin >> nam;
                spisok[num].patronymic = nam;
            }
            else
                if (kl == 4) {
                    cout << "Vvedite nomer_group: ";
                    int nam;
                    cin >> nam;
                    spisok[num].number_group = nam;
                }
                else
                    if (kl == 5) {
                        cout << "Vvedite data rozhdeniya: ";
                        int nam;
                        cin >> nam;
                        spisok[num].birthYear = nam;
                    }
                    else
                        if (kl == 6) {
                            cout << "Vvedite ocenky po fizike: ";
                            int nam;
                            cin >> nam;
                            spisok[num].physics = nam;
                        }
                        else
                            if (kl == 7) {
                                cout << "Vvedite ocenky po mat: ";
                                int nam;
                                cin >> nam;
                                spisok[num].math = nam;
                            }
                            else
                                if (kl == 8) {
                                    cout << "Vvedite ocenky po informat: ";
                                    int nam;
                                    cin >> nam;
                                    spisok[num].informatics = nam;
                                }
                                else
                                    if (kl == 9) {
                                        cout << "Vvedite ocenky po himii: ";
                                        int nam;
                                        cin >> nam;
                                        spisok[num].chemistry = nam;
                                    }
    ofstream fout("File.txt", ios::out);
    for (int i = 0; i < n; i++) {
        fout << spisok[i].name << " ";
        fout << spisok[i].surname << " ";
        fout << spisok[i].patronymic << " ";
        fout << spisok[i].number_group << " ";
        fout << spisok[i].birthYear << " ";
        fout << spisok[i].physics << " ";
        fout << spisok[i].math << " ";
        fout << spisok[i].informatics << " ";
        fout << spisok[i].chemistry << " ";
        fout << spisok[i].gap << endl;
    }
    system("cls");
    cout << "Izmenino!!!" << endl;
}

bool isGood(Student &s)
{
    if (s.informatics > 4 && s.math > 4)
        return true;
    return false;
}


void showGood()
{
    ifstream fin("File.txt", ios::in);
    string temp;
    int t = 0;
    double tt = 0;
    while (!fin.eof()) {
        fin >> temp;
        if (temp == "") break;
        student.name = temp;
        fin >> temp;
        student.surname = temp;
        fin >> temp;
        student.patronymic = temp;
        fin >> t;
        student.number_group = t;
        fin >> t;
        student.birthYear = t;
        fin >> t;
        student.physics = t;
        fin >> t;
        student.math = t;
        fin >> t;
        student.informatics = t;
        fin >> t;
        student.chemistry = t;
        fin >> tt;
        student.gap = tt;
        temp = "";
        t = 0;
        tt = 0;
        if (isGood(student))
        {
            cout << "Name : " << student.name << endl;
            cout << "Surname : " << student.surname << endl;
            cout << "Patronymic : " << student.patronymic << endl;
            cout << "Group : " << student.number_group << endl;
            cout << "Year of birth : " << student.birthYear << endl;
            cout << "Physics : " << student.physics << endl;
            cout << "Math : " << student.math << endl;
            cout << "Informatics : " << student.informatics << endl;
            cout << "Chemistry : " << student.chemistry << endl;
            cout << "Middle mark : " << student.gap << endl;
        }
    }
}


int main()
{
    while (true)
    {
        system("cls");
        int choise = 0;
        menu();
        cin >> choise;
        switch (choise)
        {
        case 1: show(); break;
        case 2: edit(); break;
        case 3: add(); break;
        case 4: individual(); break;
        case 5: showGood(); break;
        case 0: return 0;
        default:"ERROR!";
        }
        system("pause");
    }
}

void menu()
{
    cout << "Enter , what do you want :" << endl;
    cout << "1 - Show all data " << endl;
    cout << "2 - Edit " << endl;
    cout << "3 - Add " << endl;
    cout << "4 - Individual task " << endl;
    cout << "5 - Show good students" << endl;
    cout << "0 - Exit" << endl;
}