lb8

#include <iostream>              //Фамилии на  V, G, D
#include <string>
#include <fstream>


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("Show.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 thirdname: ";
    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("Show.txt", ios::in);

    string temp;
    int t = 0;
    double tt = 0;

    while (!fin.eof()) {
        fin >> temp;
        if (temp == "") break;
        cout << "\n\nName: " << temp << endl;
        fin >> temp;
        cout << "Surname: " << temp << endl;
        fin >> temp;
        cout << "Thirdname: " << temp << endl;
        fin >> t;
        cout << "Group: " << t << endl;
        fin >> t;
        cout << "Date of birth: " << t << endl;
        fin >> t;
        cout << "Physics: " << t << endl;
        fin >> t;
        cout << "Mathematics: " << t << endl;
        fin >> t;
        cout << "Informatics: " << t << endl;
        fin >> t;
        cout << "Chemistry: " << t << endl;
        fin >> tt;
        cout << "Average 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++;
    }
    int group = 0;

    cout << "Enter number of group,which students data you want to see : ";
    cin >> group;

    ofstream fout("special.txt", ios::app);

    for (int i = 0; i < n; i++) {

        if ((spisok[i].surname[0] == 'G' || spisok[i].surname[0] == 'D' || spisok[i].surname[0] == 'V') && spisok[i].number_group == group) {
            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 menu()
{
    cout << "\tChoose what you want:" << endl;
    cout << "\n\t1. View all data. " << endl;
    cout << "\t2. Change the information about the student. " << endl;
    cout << "\t3. Add student. " << endl;
    cout << "\t4. Individual task. " << endl;
    cout << "\t0. Exit. " << endl;
}


void edit() {

    system("cls");
    cout << "Enter the number of the student you want to change: ";
    int num;

    cin >> num;
    num = num - 1;

    ifstream fin("Show.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 << "Choose what you want to change: " << endl;

    cout << "1. Name." << endl;
    cout << "2. Surname." << endl;
    cout << "3. Thirdname." << endl;
    cout << "4. Number of group." << endl;
    cout << "5. Date of birth." << endl;
    cout << "6. Physics." << endl;
    cout << "7. Mathematics" << endl;
    cout << "8. Informatics" << endl;
    cout << "9. Chemistry" << endl;


    int kl = 0;
    cin >> kl;
    system("cls");

    if (kl == 1) {
        cout << "Enter new name: ";
        string name;
        cin >> name;
        spisok[num].name = name;
    }
    else
        if (kl == 2) {
            cout << "Enter new surname: ";
            string nam;
            cin >> nam;
            spisok[num].surname = nam;
        }
        else
            if (kl == 3) {
                cout << "Enter new patronymic: ";
                string nam;
                cin >> nam;
                spisok[num].patronymic = nam;
            }
            else
                if (kl == 4) {
                    cout << "Enter new number of group: ";
                    int nam;
                    cin >> nam;
                    spisok[num].number_group = nam;
                }
                else
                    if (kl == 5) {
                        cout << "Enter new date of birth: ";
                        int nam;
                        cin >> nam;
                        spisok[num].birthYear = nam;
                    }
                    else
                        if (kl == 6) {
                            cout << "Enter new a physics grade: ";
                            int nam;
                            cin >> nam;
                            spisok[num].physics = nam;
                        }
                        else
                            if (kl == 7) {
                                cout << "Enter new a math grade: ";
                                int nam;
                                cin >> nam;
                                spisok[num].math = nam;
                            }
                            else
                                if (kl == 8) {
                                    cout << "Enter new an informatics grade: ";
                                    int nam;
                                    cin >> nam;
                                    spisok[num].informatics = nam;
                                }
                                else
                                    if (kl == 9) {
                                        cout << "Enter new a chemistry grade: ";
                                        int nam;
                                        cin >> nam;
                                        spisok[num].chemistry = nam;
                                    }

    ofstream fout("Show.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 << "Changes have been made." << endl;
}


int main()
{
    while (true)
    {
        system("color 07");
        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 0: return 0;

        default:"ERROR!";
        }
        system("pause");
    }
}