Rezumat problemă

SumaPare

#46

Să se scrie un program care citește numărul natural n și determină suma 2+4+..+(2n).

Consola Candale Silviu (silviu) ușoară

Clasa 9 Algoritmi elementari Sume, produse, numărări

Rezolvă

Detalii

Problema	SumaPare	Operații I/O	tastatură/ecran
Limita timp	0.1 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#64610924	Utilizator	Georoceanu Ingrid (IngrIDJHEFlAvia)
Fișier	sumapare.cpp	Dimensiune	212 B
Data încărcării	18 Mai 2026, 15:49	Scor/rezultat	Eroare de compilare

Evaluare

Mesaj compilare

sumapare.cpp: In function ‘int main()’:
sumapare.cpp:14:10: error: no match for ‘operator>>’ (operand types are ‘std::ostream’ {aka ‘std::basic_ostream<char>’} and ‘const char [11]’)
   14 |     cout >> "Suma este " << S;
      |     ~~~~ ^~ ~~~~~~~~~~~~
      |     |       |
      |     |       const char [11]
      |     std::ostream {aka std::basic_ostream<char>}
In file included from /usr/include/c++/13/string:55,
                 from /usr/include/c++/13/bits/locale_classes.h:40,
                 from /usr/include/c++/13/bits/ios_base.h:41,
                 from /usr/include/c++/13/ios:44,
                 from /usr/include/c++/13/ostream:40,
                 from /usr/include/c++/13/iostream:41,
                 from sumapare.cpp:1:
/usr/include/c++/13/bits/basic_string.tcc:827:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
  827 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/usr/include/c++/13/bits/basic_string.tcc:827:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<_CharT, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
In file included from /usr/include/c++/13/istream:1106,
                 from /usr/include/c++/13/iostream:42:
/usr/include/c++/13/bits/istream.tcc:975:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT&)’
  975 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/usr/include/c++/13/bits/istream.tcc:975:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<_CharT, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
/usr/include/c++/13/istream:846:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char&)’
  846 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/usr/include/c++/13/istream:846:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<char, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
/usr/include/c++/13/istream:851:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char&)’
  851 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/usr/include/c++/13/istream:851:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<char, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
/usr/include/c++/13/istream:893:5: note: candidate: ‘template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT*)’
  893 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/13/istream:893:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<_CharT, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
/usr/include/c++/13/istream:936:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char*)’
  936 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/13/istream:936:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<char, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
/usr/include/c++/13/istream:942:5: note: candidate: ‘template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char*)’
  942 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/13/istream:942:5: note:   template argument deduction/substitution failed:
sumapare.cpp:14:13: note:   ‘std::ostream’ {aka ‘std::basic_ostream<char>’} is not derived from ‘std::basic_istream<char, _Traits>’
   14 |     cout >> "Suma este " << S;
      |             ^~~~~~~~~~~~
/usr/include/c++/13/istream:1096:5: note: candidate: ‘template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&)’
 1096 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
/usr/include/c++/13/istream:1096:5: note:   template argument deduction/substitution failed:
/usr/include/c++/13/istream: In substitution of ‘template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::basic_ostream<char>&; _Tp = const char (&)[11]]’:
sumapare.cpp:14:13:   required from here
/usr/include/c++/13/istream:1096:5: error: no type named ‘type’ in ‘struct std::enable_if<false, void>’

Cum funcționează evaluarea?