Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:10:12: error: reference to ‘prev’ is ambiguous else if ((prev>='a'&&prev<='z')||(prev>='A'&&prev<='Z'))k++; ^ user.cpp:5:10: note: candidates are: char prev char x,n,prev; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^ user.cpp:10:23: error: reference to ‘prev’ is ambiguous else if ((prev>='a'&&prev<='z')||(prev>='A'&&prev<='Z'))k++; ^ user.cpp:5:10: note: candidates are: char prev char x,n,prev; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^ user.cpp:10:36: error: reference to ‘prev’ is ambiguous else if ((prev>='a'&&prev<='z')||(prev>='A'&&prev<='Z'))k++; ^ user.cpp:5:10: note: candidates are: char prev char x,n,prev; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^ user.cpp:10:47: error: reference to ‘prev’ is ambiguous else if ((prev>='a'&&prev<='z')||(prev>='A'&&prev<='Z'))k++; ^ user.cpp:5:10: note: candidates are: char prev