Rezumat problemă

Expresie3

#335

Să se scrie un program care citește numărul natural n și determină suma S=1*2-2*3+3*4-...±n*(n+1).

Consola Candale Silviu (silviu) ușoară

Clasa 9 Algoritmi elementari Sume, produse, numărări

Rezolvă

Detalii

Problema	Expresie3	Operații I/O	tastatură/ecran
Limita timp	0.1 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#57658478	Utilizator	Prigorianu Denisa (Denisa_Prigorianu)
Fișier	expresie3.cpp	Dimensiune	279 B
Data încărcării	09 Aprilie 2025, 12:40	Scor / rezultat	Eroare de compilare

Evaluare

Mesaj compilare

expresie3.cpp: In function 'int main()':
expresie3.cpp:17:29: error: no match for 'operator>>' (operand types are 'std::basic_ostream<char>' and 'int')
     cout<<"Rezultatul este ">>s;

                             ^
expresie3.cpp:17:29: note: candidates are:
In file included from /usr/include/c++/4.8/string:53:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/bits/basic_string.tcc:996:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&)
     operator>>(basic_istream<_CharT, _Traits>& __in,
     ^
/usr/include/c++/4.8/bits/basic_string.tcc:996:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/istream:882:0,
                 from /usr/include/c++/4.8/iostream:40,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/bits/istream.tcc:955:5: note: template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
     ^
/usr/include/c++/4.8/bits/istream.tcc:955:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/istream:882:0,
                 from /usr/include/c++/4.8/iostream:40,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/bits/istream.tcc:923:5: note: template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
     ^
/usr/include/c++/4.8/bits/istream.tcc:923:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/istream:727:5: note: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
     ^
/usr/include/c++/4.8/istream:727:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/istream:732:5: note: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)
     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
     ^
/usr/include/c++/4.8/istream:732:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/istream:774:5: note: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
     ^
/usr/include/c++/4.8/istream:774:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/istream:779:5: note: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)
     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
     ^
/usr/include/c++/4.8/istream:779:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<char, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^
In file included from /usr/include/c++/4.8/iostream:40:0,
                 from expresie3.cpp:1:
/usr/include/c++/4.8/istream:872:5: note: template<class _CharT, class _Traits, class _Tp> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&)
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^
/usr/include/c++/4.8/istream:872:5: note:   template argument deduction/substitution failed:
expresie3.cpp:17:31: note:   'std::basic_ostream<char>' is not derived from 'std::basic_istream<_CharT, _Traits>'
     cout<<"Rezultatul este ">>s;

                               ^

Cum funcționează evaluarea?