table.cpp

#include <iostream>
#include <fstream>

using std::string;

#define MARKS_COUNT 5

struct student
{
    student(unsigned, string, int *);
    student();
    friend std::ostream &operator<<(std::ostream &l, const student &s);
    friend int operator>>(std::istream &l, student &s);

private:
    unsigned number;
    string name;
    int *marks;
};

student::student() {}

student::student(unsigned _number, string _name, int *_marks) : number(_number), name(_name), marks(_marks) {}

std::ostream &operator<<(std::ostream &l, const student &s)
{
    l << s.number << ';';
    l << s.name << ';';
    for (int i = 0; i < MARKS_COUNT - 1; ++i) l << s.marks[i] << ";";
    l << s.marks[MARKS_COUNT - 1] << '\n';
    return l;
}

int operator>>(std::istream &l, student &s)
{
    unsigned _number;
    string _name;
    int *_marks = new int[MARKS_COUNT];
    std::cout << "Enter num: \n";

    l >> _number;
    if (!_number)
        return 1;
    std::cout << "Enter name:\n";

    l >> _name;
    std::cout << "Grades:\n";

    for (int i = 0; i < MARKS_COUNT; ++i) l >> _marks[i];
    s = student(_number, _name, _marks);
    return 0;
}

int main()
{
    std::fstream table;
    table.open("students.csv", std::ios::out);
    student s;
    do {
        if (std::cin >> s) break;
        table << s;
    } while (true);

    table.close();


    return 0;
}