jacys tam uczniaki

#include <iostream>

const int SLEN = 30;

struct student {
char fullname[SLEN];
char hobby[SLEN];
int ooplevel;
};
int getinfo(student pa[], int n);
void display1(student st);
void display2(const student * ps);
void display3(const student pa[], int n);

int main()
{
    std::cout << "Podaj wielkosc grupy: ";
    int class_size;
    std::cin >> class_size;
    while (std::cin.get()!= '\n')
        continue;
    student * ptr_stu = new student[class_size];
    int entered = getinfo(ptr_stu, class_size);
    for(int i = 0; i < entered; i++)
    {
        display1(ptr_stu[i]);
        display2(&ptr_stu[i]);
    }
    display3(ptr_stu, entered);
    delete []ptr_stu;
    std::cout << "gotowe!\n";
    return 0;
}

int getinfo(student pa[], int n)
{
    int i = 0;
    while(i<n)
    {
        std::cout << "Podaj imie i nazwisko ucznia: ";
        std::cin.getline(pa[i].fullname, SLEN);
        std::cout << "Podaj hobby ucznia: ";
        std::cin.getline(pa[i].hobby, SLEN);
        std::cout << "Podaj, w ktorej klasie jest uczen(cyfra): ";
        std::cin >> pa[i].ooplevel;
        std::cin.ignore();
        i++;
    }
    return i;
}
void display1(student st)
{
    std::cout << st.fullname << ", "
              << st.hobby << ", klasa "
              << st.ooplevel << " | ";
}
void display2(const student * ps)
{
    std::cout << ps->fullname << ", "
              << ps->hobby << ", klasa "
              << ps->ooplevel << "\n";
}
void display3(const student pa[], int n)
{
    for(int i = 0; i<n; i++)
    {
        std::cout << pa[i].fullname << ", "
                  << pa[i].hobby << ", klasa "
                  << pa[i].ooplevel << "\n";
    }
}