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	#64168101	Utilizator	puie george (georgemihai123)
Fișier	sumapare.cpp	Dimensiune	156 B
Data încărcării	21 Aprilie 2026, 12:25	Scor/rezultat	Eroare de compilare

Evaluare

Mesaj compilare

sumapare.cpp: In function ‘int main()’:
sumapare.cpp:9:22: error: no match for ‘operator<’ (operand types are ‘std::basic_ostream<char>’ and ‘int’)
    9 |     cout<<"Suma este"<s;
      |     ~~~~~~~~~~~~~~~~~^~
      |         |             |
      |         |             int
      |         std::basic_ostream<char>
sumapare.cpp:9:22: note: candidate: ‘operator<(int, int)’ (built-in)
    9 |     cout<<"Suma este"<s;
      |     ~~~~~~~~~~~~~~~~~^~
sumapare.cpp:9:22: note:   no known conversion for argument 1 from ‘std::basic_ostream<char>’ to ‘int’
In file included from /usr/include/c++/13/string:48,
                 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/stl_iterator.h:455:5: note: candidate: ‘template<class _Iterator> bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)’
  455 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:455:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
    9 |     cout<<"Suma este"<s;
      |                       ^
/usr/include/c++/13/bits/stl_iterator.h:500:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)’
  500 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:500:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
    9 |     cout<<"Suma este"<s;
      |                       ^
/usr/include/c++/13/bits/stl_iterator.h:1705:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)’
 1705 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1705:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::move_iterator<_IteratorL>’
    9 |     cout<<"Suma este"<s;
      |                       ^
/usr/include/c++/13/bits/stl_iterator.h:1770:5: note: candidate: ‘template<class _Iterator> bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)’
 1770 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1770:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::move_iterator<_IteratorL>’
    9 |     cout<<"Suma este"<s;
      |                       ^
In file included from /usr/include/c++/13/bits/stl_algobase.h:64,
                 from /usr/include/c++/13/string:51:
/usr/include/c++/13/bits/stl_pair.h:835:5: note: candidate: ‘template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)’
  835 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_pair.h:835:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::pair<_T1, _T2>’
    9 |     cout<<"Suma este"<s;
      |                       ^
In file included from /usr/include/c++/13/string:54:
/usr/include/c++/13/bits/basic_string.h:3829:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Alloc>&, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 3829 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/basic_string.h:3829:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
    9 |     cout<<"Suma este"<s;
      |                       ^
/usr/include/c++/13/bits/basic_string.h:3843:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)’
 3843 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/basic_string.h:3843:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   ‘std::basic_ostream<char>’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
    9 |     cout<<"Suma este"<s;
      |                       ^
/usr/include/c++/13/bits/basic_string.h:3856:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
 3856 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/basic_string.h:3856:5: note:   template argument deduction/substitution failed:
sumapare.cpp:9:23: note:   mismatched types ‘const _CharT*’ and ‘std::basic_ostream<char>’
    9 |     cout<<"Suma este"<s;
      |                       ^
In file included from /usr/include/c++/13/bits/ios_base.h:46:
/usr/include/c++/13/system_error:324:3: note: candidate: ‘bool std::operator<(const error_code&, const error_code&)’
  324 |   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/13/system_error:324:31: note:   no known conversion for argument 1 from ‘std::basic_ostream<char>’ to ‘const std::error_code&’
  324 |   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
      |             ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/13/system_error:507:3: note: candidate: ‘bool std::operator<(const error_condition&, const error_condition&)’
  507 |   operator<(const error_condition& __lhs,
      |   ^~~~~~~~
/usr/include/c++/13/system_error:507:36: note:   no known conversion for argument 1 from ‘std::basic_ostream<char>’ to ‘const std::error_condition&’
  507 |   operator<(const error_condition& __lhs,
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~

Cum funcționează evaluarea?