Rezumat problemă

UltimaCifraPara

#77

Să se scrie un program care să determine ultima cifră pară a unui număr natural citit de la tastatură.

Consola Candale Silviu (silviu) ușoară

Clasa 9 Algoritmi elementari Cifrele unui număr

Rezolvă

Detalii

Problema	UltimaCifraPara	Operații I/O	tastatură/ecran
Limita timp	0.1 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#64237530	Utilizator	Moldovan Alexandru-George (alexx_mag)
Fișier	ultimacifrapara.cpp	Dimensiune	225 B
Data încărcării	24 Aprilie 2026, 15:17	Scor/rezultat	Eroare de compilare

Evaluare

Mesaj compilare

ultimacifrapara.cpp: In function ‘int main()’:
ultimacifrapara.cpp:6:15: error: no match for ‘operator-’ (operand types are ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} and ‘char’)
    6 |         if((s - '0') % 2 == 0) {
      |             ~ ^ ~~~
      |             |   |
      |             |   char
      |             std::string {aka std::__cxx11::basic_string<char>}
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 ultimacifrapara.cpp:1:
/usr/include/c++/13/bits/stl_iterator.h:625:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)’
  625 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:625:5: note:   template argument deduction/substitution failed:
ultimacifrapara.cpp:6:17: note:   ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::reverse_iterator<_Iterator>’
    6 |         if((s - '0') % 2 == 0) {
      |                 ^~~
/usr/include/c++/13/bits/stl_iterator.h:1800:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)’
 1800 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1800:5: note:   template argument deduction/substitution failed:
ultimacifrapara.cpp:6:17: note:   ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::move_iterator<_IteratorL>’
    6 |         if((s - '0') % 2 == 0) {
      |                 ^~~
ultimacifrapara.cpp:7:23: error: no match for ‘operator-’ (operand types are ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} and ‘char’)
    7 |             cout << s - '0';
      |                     ~ ^ ~~~
      |                     |   |
      |                     |   char
      |                     std::string {aka std::__cxx11::basic_string<char>}
/usr/include/c++/13/bits/stl_iterator.h:625:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)’
  625 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:625:5: note:   template argument deduction/substitution failed:
ultimacifrapara.cpp:7:25: note:   ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::reverse_iterator<_Iterator>’
    7 |             cout << s - '0';
      |                         ^~~
/usr/include/c++/13/bits/stl_iterator.h:1800:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)’
 1800 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1800:5: note:   template argument deduction/substitution failed:
ultimacifrapara.cpp:7:25: note:   ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::move_iterator<_IteratorL>’
    7 |             cout << s - '0';
      |                         ^~~
ultimacifrapara.cpp:5:18: warning: unused variable ‘c’ [-Wunused-variable]
    5 |         for(char c : s) {
      |                  ^

Cum funcționează evaluarea?