Students_binary

#include <iostream>
#include <fstream>
#define nmarks 2
#define nsessions 2
#define nstudent 3

using namespace std;
struct Tstudent
{
    char FIO[40], exam_name[10];
    unsigned int nkurs, ngroup, exam_mark;
    int marks[nsessions][nmarks];
    bool study_form;
};

Tstudent* Read_from_file(ifstream &f)
{
    Tstudent* temp = new Tstudent;
    f.read((char*)temp,sizeof(Tstudent));
    return temp;
}

unsigned int check(int m[nsessions][nmarks])
{
    bool otl = 1;
    for(int i=0;i<nsessions;i++)
    {
        for(int j=0; j<nmarks; j++)
            if(m[i][j]!=5)
            {
                otl=0;
                break;
            }
        if(!otl)
            break;
    }
    return otl;
}

int Task(ifstream &f)
{
    unsigned int countOtl=0, count_max=0, nk=0, ng=0, ng_max=0;
    unsigned int kurs_not_changed = 1;
    unsigned int group_not_changed = 1;
    Tstudent* temp = new Tstudent;
    cout<<"_____"<<endl;
    while(!f.eof())
    {
        f.read((char*)temp,sizeof(Tstudent));
        if(ng!= temp->ngroup)
        {
            if(count_max<countOtl)
            {
                ng_max=ng;
                count_max = countOtl;
            }
            if(ng!=0)
                group_not_changed = 0;
            ng=temp->ngroup;
            countOtl = 0;
        }
        if (nk==0)
            nk = temp->nkurs;
        if (nk!=temp->nkurs)
        {
            cout<<"|"<<nk<<"|"<<ng_max<<"|"<<endl;
            nk=temp->nkurs;
            countOtl = 0;
            count_max = 0;
            kurs_not_changed = 0;
        }
        countOtl = countOtl + check(temp->marks);

    }

    if(group_not_changed)
        ng_max = ng;
    if(count_max<countOtl)
    {
        ng_max = ng;
        cout<<"|"<<nk<<"|"<<ng_max<<"|"<<endl;
    }
    if(kurs_not_changed)
        cout<<"|"<<nk<<"|"<<ng_max<<"|"<<endl;
    cout<<"_____"<<endl;
    return 0;
}

int Write_to_file(Tstudent* st, ofstream &f)
{
    if(st!=NULL)
    {
        f.write((char*)st,sizeof(Tstudent));
        return 0;
    }
    else
        return 1;
}

Tstudent* Read_from_keyboard()
{
    Tstudent* temp = new Tstudent;
    cout << "Введите ФИО студента ";
    cin >> temp->FIO;
    cout << "Введите номер курса ";
    cin >> temp->nkurs;
    cout << "Введите номер группы ";
    cin >> temp->ngroup;
    cout << "Введите оценки ";
    for(int i=0;i<nsessions;i++)
        for(int j=0;j<nmarks;j++)
            cin >> temp->marks[i][j];
    cout << "Введите форму обучение(1 - очная, 0 - заочная) ";
    cin >> temp->study_form;
    cout << "Введите название экзамена ";
    cin >> temp->exam_name;
    cout << "Введите оценку за экзамен ";
    cin >> temp->exam_mark;
    return temp;
}

int main()
{
    setlocale(0,"");
    char answer;
    cout<<"Create new file?(y/n)";
    cin>>answer;
    if(answer=='y')
    {
        ofstream output_file("student.dat",ios::binary|ios::out);
        for(int i=0;i<nstudent;i++)
            Write_to_file(Read_from_keyboard(),output_file);

        output_file.close();
        ifstream input_file("student.dat",ios::binary|ios::in);
        Task(input_file);
        input_file.close();
        return 0;
    }
    else
    {
        ifstream input_file("student.dat",ios::binary|ios::in);
        Task(input_file);
        input_file.close();
        return 0;
    }
    //return 0;
}