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#include <iostream>
#include <string>
using namespace std;
 
class osoba{
protected:
    string* imie;
    string nazwisko;
public:
    osoba():imie(new string("brak ")),nazwisko("brak"){}
    osoba(const string& a1,const string& a2):imie(new string(a1)),nazwisko(a2){}
    osoba(const osoba& ob):imie(new string(*ob.imie)),nazwisko(ob.nazwisko){}
    virtual ostream& wypisz(ostream& out){out << *imie << " " << nazwisko;}
    friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
    virtual ~osoba(){delete imie;}
};
class student:public osoba{
    string kierunek;
    unsigned rok;
public:
    student():osoba(){}
    student(const osoba& ob):osoba(ob){}
    student(const osoba& ob,const string& a1,const unsigned& a2):osoba(ob),kierunek(a1),rok(a2){}
    ostream& wypisz(ostream& out){out << *imie << " " << nazwisko << " " << kierunek << " " << rok << endl;}
};
//osoba::ktory = 0;
int main()
{
    const osoba o1("Jan", "Kowalski");
    const osoba o2("Ewa", "Nowak");
 
    osoba* tab[5];
 
    tab[0] = new osoba;
    tab[1] = new student;
    tab[2] = new osoba("Ala", "Kot");
    tab[3] = new student(o1);
    tab[4] = new student(o2, "Informatyka",3);
 
    for(int i = 0; i < 5; i++)
        try
        {
            cout << *tab[i] << endl;
        }
        catch (const string& err)
        {
            cerr << err << endl;
        }
 
    cout << "**********" << endl;
 
    return 0;
}

prog.cpp: In function 'std::ostream& operator<<(std::ostream&, osoba&)':
prog.cpp:14:60: error: no match for 'operator<<' (operand types are 'std::ostream {aka std::basic_ostream<char>}' and 'std::ostream {aka std::basic_ostream<char>}')
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                            ^
prog.cpp:14:60: note: candidate: operator<<(int, int) <built-in>
prog.cpp:14:60: note:   no known conversion for argument 2 from 'std::ostream {aka std::basic_ostream<char>}' to 'int'
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:108:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ostream_type& (*)(std::basic_ostream<_CharT, _Traits>::__ostream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(__ostream_type& (*__pf)(__ostream_type&))
       ^
/usr/include/c++/5/ostream:108:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'std::basic_ostream<char>::__ostream_type& (*)(std::basic_ostream<char>::__ostream_type&) {aka std::basic_ostream<char>& (*)(std::basic_ostream<char>&)}'
/usr/include/c++/5/ostream:117:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__ios_type& (*)(std::basic_ostream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>; std::basic_ostream<_CharT, _Traits>::__ios_type = std::basic_ios<char>]
       operator<<(__ios_type& (*__pf)(__ios_type&))
       ^
/usr/include/c++/5/ostream:117:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'std::basic_ostream<char>::__ios_type& (*)(std::basic_ostream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}'
/usr/include/c++/5/ostream:127:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(ios_base& (*__pf) (ios_base&))
       ^
/usr/include/c++/5/ostream:127:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'std::ios_base& (*)(std::ios_base&)'
/usr/include/c++/5/ostream:166:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(long __n)
       ^
/usr/include/c++/5/ostream:166:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'long int'
/usr/include/c++/5/ostream:170:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(unsigned long __n)
       ^
/usr/include/c++/5/ostream:170:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'long unsigned int'
/usr/include/c++/5/ostream:174:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(bool __n)
       ^
/usr/include/c++/5/ostream:174:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'bool'
In file included from /usr/include/c++/5/ostream:638:0,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/ostream.tcc:91:5: note: candidate: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char; _Traits = std::char_traits<char>]
     basic_ostream<_CharT, _Traits>::
     ^
/usr/include/c++/5/bits/ostream.tcc:91:5: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'short int'
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:181:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(unsigned short __n)
       ^
/usr/include/c++/5/ostream:181:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'short unsigned int'
In file included from /usr/include/c++/5/ostream:638:0,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/ostream.tcc:105:5: note: candidate: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char; _Traits = std::char_traits<char>]
     basic_ostream<_CharT, _Traits>::
     ^
/usr/include/c++/5/bits/ostream.tcc:105:5: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'int'
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:192:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(unsigned int __n)
       ^
/usr/include/c++/5/ostream:192:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'unsigned int'
/usr/include/c++/5/ostream:201:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(long long __n)
       ^
/usr/include/c++/5/ostream:201:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'long long int'
/usr/include/c++/5/ostream:205:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(unsigned long long __n)
       ^
/usr/include/c++/5/ostream:205:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'long long unsigned int'
/usr/include/c++/5/ostream:220:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(double __f)
       ^
/usr/include/c++/5/ostream:220:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'double'
/usr/include/c++/5/ostream:224:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(float __f)
       ^
/usr/include/c++/5/ostream:224:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'float'
/usr/include/c++/5/ostream:232:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(long double __f)
       ^
/usr/include/c++/5/ostream:232:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'long double'
/usr/include/c++/5/ostream:245:7: note: candidate: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__ostream_type = std::basic_ostream<char>]
       operator<<(const void* __p)
       ^
/usr/include/c++/5/ostream:245:7: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'const void*'
In file included from /usr/include/c++/5/ostream:638:0,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/ostream.tcc:119:5: note: candidate: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>::__streambuf_type*) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_ostream<_CharT, _Traits>::__streambuf_type = std::basic_streambuf<char>]
     basic_ostream<_CharT, _Traits>::
     ^
/usr/include/c++/5/bits/ostream.tcc:119:5: note:   no known conversion for argument 1 from 'std::ostream {aka std::basic_ostream<char>}' to 'std::basic_ostream<char>::__streambuf_type* {aka std::basic_streambuf<char>*}'
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/basic_string.h:5170:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^
/usr/include/c++/5/bits/basic_string.h:5170:5: note:   template argument deduction/substitution failed:
prog.cpp:14:76: note:   'std::ostream {aka std::basic_ostream<char>}' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                            ^
In file included from /usr/include/c++/5/bits/ios_base.h:46:0,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/system_error:209:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)
     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
     ^
/usr/include/c++/5/system_error:209:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'const std::error_code&'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:497:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^
/usr/include/c++/5/ostream:497:5: note:   template argument deduction/substitution failed:
prog.cpp:14:76: note:   deduced conflicting types for parameter '_CharT' ('char' and 'std::basic_ostream<char>')
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                            ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:502:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^
/usr/include/c++/5/ostream:502:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'char'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:508:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^
/usr/include/c++/5/ostream:508:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'char'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:514:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^
/usr/include/c++/5/ostream:514:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'signed char'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:519:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^
/usr/include/c++/5/ostream:519:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'unsigned char'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:539:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^
/usr/include/c++/5/ostream:539:5: note:   template argument deduction/substitution failed:
prog.cpp:14:76: note:   mismatched types 'const _CharT*' and 'std::basic_ostream<char>'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                            ^
In file included from /usr/include/c++/5/ostream:638:0,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/ostream.tcc:321:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/5/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'const char*'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:556:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^
/usr/include/c++/5/ostream:556:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'const char*'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:569:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^
/usr/include/c++/5/ostream:569:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'const signed char*'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:574:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^
/usr/include/c++/5/ostream:574:5: note:   template argument deduction/substitution failed:
prog.cpp:14:72: note:   cannot convert '(& ob)->osoba::wypisz((* & out))' (type 'std::ostream {aka std::basic_ostream<char>}') to type 'const unsigned char*'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                        ^
In file included from /usr/include/c++/5/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/5/ostream:628:5: note: candidate: std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::basic_ostream<char>] <near match>
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^
/usr/include/c++/5/ostream:628:5: note:   conversion of argument 1 would be ill-formed:
prog.cpp:14:76: error: cannot bind 'std::ostream {aka std::basic_ostream<char>}' lvalue to 'std::basic_ostream<char>&&'
     friend ostream& operator<<(ostream& out,osoba& ob){out << ob.wypisz(out);}
                                                                            ^

Standard output is empty