Кек

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
struct abitu {
    char name[21];
    int NumList;
    int matem, Rus, Physics;
};
void first(string filename)
{
    int LengthName = 20;
    ifstream fin(filename, ios::binary);
    abitu man;
    while (fin.peek() != EOF)
    {
        fin.read((char*)&man, sizeof(abitu));
        cout << man.name << " " << man.matem;
        if (man.Rus == 5)
        {
            cout << " " << "Русский язык";
        }
        if (man.Physics == 5)
        {
            cout << " " << "Физика";
        }
        cout << endl;
    }
    fin.close();
}
void second(string filename)
{
    int LengthName = 20;
    ifstream fin(filename, ios::binary);
    abitu man;
    while (fin.peek() != EOF)
    {
        fin.read((char*)&man, sizeof(abitu));
        cout << man.name << " " << man.NumList << " ";
        cout << (((double)(man.matem + man.Rus + man.Physics)) / 3);
        cout << endl;
    }
    fin.close();
}
void third(string filename)
{
    int LengthName = 20;
    const int n = 3;
    ifstream fin(filename, ios::binary);
    abitu man;
    double Marks[n] = { 0 };
    int count = 0;
    while (fin.peek() != EOF)
    {
        fin.read((char*)&man, sizeof(abitu));
        count++;
        Marks[0] += man.matem;
        Marks[1] += man.Rus;
        Marks[2] += man.Physics;
}
    cout  << "Математика"  << (Marks[0] / count) << endl;
    cout  << "Русский язык"  << (Marks[1] / count) << endl;
    cout << "Физика" << (Marks[2] / count) << endl;
    fin.close();
}
void fourth(string filename)
{
    const int n = 3;
    int LengthName = 20;
    ifstream fin(filename, ios::binary);
    abitu man;
    int Marks[n] = { 0 };
    int count = 0;
    while (fin.peek() != EOF)
    {
        fin.read((char*)&man, sizeof(abitu));
        count++;
        Marks[man.matem - 3]++;
    }
    cout << "Кол-во оценок по математике" << endl;
    cout << setw(LengthName) << "3 " << (Marks[0]) << endl;
    cout << setw(LengthName) << "4" << (Marks[1]) << endl;
    cout << setw(LengthName) << "5" << (Marks[2]) << endl;
    fin.close();
}
void fifth(string filename)
{
    int LengthName = 20;
    ifstream fin(filename, ios::binary);
    ofstream fout("out.bin", ios::binary);
    abitu man;
    while (fin.peek() != EOF)
    {
        fin.read((char*)&man, sizeof(abitu));
        if (man.matem + man.Rus + man.Physics >= 12)
            fout.write((char*)&man, sizeof(abitu));
    }
    fin.close();
    fout.close();
    fin.open("out.bin", ios::binary);
    while (fin.peek() != EOF)
    {
        fin.read((char*)&man, sizeof(abitu));
        cout << setw(LengthName) << man.name << " " << man.NumList << " ";
        cout << "Матем. " << man.matem << " Рус. " << man.Rus << " Физ. " << man.Physics;
        cout << endl;
    }
    fin.close();
}

int main()
{
    setlocale(LC_ALL, "Russian");
    ifstream fin("abitu.txt");
    ofstream fout("abitu.bin", ios::binary);
    if (!fin.is_open())
    {
        cout << "can't open file" << endl;
        exit(-1);
    }
    else
    {
        abitu man;
        while (fin.peek() != EOF)
        {
            fin >> man.name;
            fin >> man.NumList;
            fin >> man.matem >> man.Rus >> man.Physics;
            fout.write((char*)&man, sizeof(abitu));

        }
        fin.close();
        fout.close();
        third("abitu.bin");
    }
    system("pause");
    return 0;
}