小弟本是打算弄一個為一段訊息進行加密的CPP program 來玩玩, 順帶喚起很久以前學的c++ 的技巧。 可是, 卻不知為何出了這樣的錯
> ( from /usr/include/libio.h:31,```
> from /usr/include/stdio.h:74,
> from /usr/include/c++/6/cstdio:42,
> from /usr/include/c++/6/ext/string_conversions.h:43,
> from /usr/include/c++/6/bits/basic_string.h:5429,
> from /usr/include/c++/6/string:52,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> main.cpp: In function ‘void dictionary(std::string*)’:
> main.cpp:19:14: error: ambiguous overload for ‘operator=’ (operand types are ‘std::string {aka std::basic_string}’ and ‘long int’)
> if (*p = NULL)
> ^
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:3096:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::operator=(const std::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits; _Alloc = std::allocator]
> operator=(const basic_string& __str)
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:3104:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*) [with _CharT = char; _Traits = std::char_traits; _Alloc = std::allocator]
> operator=(const _CharT* __s)
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:3115:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::operator=(_CharT) [with _CharT = char; _Traits = std::char_traits; _Alloc = std::allocator]
> operator=(_CharT __c)
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:3131:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::operator=(std::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits; _Alloc = std::allocator]
> operator=(basic_string&& __str)
> ^~~~~~~~
> main.cpp:24:12: error: could not convert ‘* p’ from ‘std::string {aka std::basic_string}’ to ‘bool’
> while (*p)
> ^~
> main.cpp:26:15: error: no match for ‘operator==’ (operand types are ‘std::string {aka std::basic_string}’ and ‘char’)
> if(*p == ' ')
> ~~~^~~~~~
> In file included from /usr/include/c++/6/iosfwd:40:0,
> from /usr/include/c++/6/ios:38,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/postypes.h:216:5: note: candidate: template bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
> operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
> ^~~~~~~~
> /usr/include/c++/6/bits/postypes.h:216:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::fpos<_StateT>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_pair.h:440:5: note: candidate: template constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
> operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_pair.h:440:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::pair<_T1, _T2>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:295:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
> operator==(const reverse_iterator<_Iterator>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:295:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:352:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
> operator==(const reverse_iterator<_IteratorL>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:352:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:1116:5: note: candidate: template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
> operator==(const move_iterator<_IteratorL>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:1116:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::move_iterator<_IteratorL>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:1122:5: note: candidate: template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
> operator==(const move_iterator<_Iterator>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:1122:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::move_iterator<_IteratorL>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/string:41:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/allocator.h:146:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
> operator==(const allocator<_T1>&, const allocator<_T2>&)
> ^~~~~~~~
> /usr/include/c++/6/bits/allocator.h:146:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::allocator<_CharT>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/string:41:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/allocator.h:152:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
> operator==(const allocator<_Tp>&, const allocator<_Tp>&)
> ^~~~~~~~
> /usr/include/c++/6/bits/allocator.h:152:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::allocator<_CharT>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5077:5: note: candidate: template bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
> operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5077:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: mismatched types ‘const std::basic_string<_CharT, _Traits, _Alloc>’ and ‘char’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5085:5: note: candidate: template typename __gnu_cxx::__enable_if::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
> operator==(const basic_string<_CharT>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5085:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: mismatched types ‘const std::basic_string<_CharT>’ and ‘char’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5099:5: note: candidate: template bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
> operator==(const _CharT* __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5099:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: mismatched types ‘const _CharT*’ and ‘std::basic_string’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5111:5: note: candidate: template bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
> operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5111:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: mismatched types ‘const _CharT*’ and ‘char’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/ios_base.h:46:0,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/system_error:284:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
> operator==(const error_code& __lhs, const error_code& __rhs) noexcept
> ^~~~~~~~
> /usr/include/c++/6/system_error:284:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_code&’
> /usr/include/c++/6/system_error:289:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
> operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
> ^~~~~~~~
> /usr/include/c++/6/system_error:289:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_code&’
> /usr/include/c++/6/system_error:296:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
> operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
> ^~~~~~~~
> /usr/include/c++/6/system_error:296:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_condition&’
> /usr/include/c++/6/system_error:303:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
> operator==(const error_condition& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/system_error:303:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_condition&’
> In file included from /usr/include/c++/6/bits/locale_facets.h:48:0,
> from /usr/include/c++/6/bits/basic_ios.h:37,
> from /usr/include/c++/6/ios:44,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/streambuf_iterator.h:204:5: note: candidate: template bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
> operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
> ^~~~~~~~
> /usr/include/c++/6/bits/streambuf_iterator.h:204:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
> from /usr/include/c++/6/bits/allocator.h:46,
> from /usr/include/c++/6/string:41,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/ext/new_allocator.h:139:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
> operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
> ^~~~~~~~
> /usr/include/c++/6/ext/new_allocator.h:139:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const __gnu_cxx::new_allocator<_Tp>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:866:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
> operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:866:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’
> if(*p == ' ')
> ^~~
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:859:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
> operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:859:5: note: template argument deduction/substitution failed:
> main.cpp:26:18: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_IteratorL, _Container>’
> if(*p == ' ')
> ^~~
> main.cpp:32:20: error: no match for ‘operator==’ (operand types are ‘std::string {aka std::basic_string}’ and ‘char’)
> if (*p == lett[t])
> ~~~^~~~~~~~~~
> In file included from /usr/include/c++/6/iosfwd:40:0,
> from /usr/include/c++/6/ios:38,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/postypes.h:216:5: note: candidate: template bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
> operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
> ^~~~~~~~
> /usr/include/c++/6/bits/postypes.h:216:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::fpos<_StateT>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_pair.h:440:5: note: candidate: template constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
> operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_pair.h:440:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::pair<_T1, _T2>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:295:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
> operator==(const reverse_iterator<_Iterator>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:295:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:352:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
> operator==(const reverse_iterator<_IteratorL>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:352:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:1116:5: note: candidate: template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
> operator==(const move_iterator<_IteratorL>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:1116:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::move_iterator<_IteratorL>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:1122:5: note: candidate: template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
> operator==(const move_iterator<_Iterator>& __x,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:1122:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::move_iterator<_IteratorL>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/string:41:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/allocator.h:146:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
> operator==(const allocator<_T1>&, const allocator<_T2>&)
> ^~~~~~~~
> /usr/include/c++/6/bits/allocator.h:146:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::allocator<_CharT>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/string:41:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/allocator.h:152:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
> operator==(const allocator<_Tp>&, const allocator<_Tp>&)
> ^~~~~~~~
> /usr/include/c++/6/bits/allocator.h:152:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::allocator<_CharT>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5077:5: note: candidate: template bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
> operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5077:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: mismatched types ‘const std::basic_string<_CharT, _Traits, _Alloc>’ and ‘char’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5085:5: note: candidate: template typename __gnu_cxx::__enable_if::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
> operator==(const basic_string<_CharT>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5085:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: mismatched types ‘const std::basic_string<_CharT>’ and ‘char’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5099:5: note: candidate: template bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
> operator==(const _CharT* __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5099:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: mismatched types ‘const _CharT*’ and ‘std::basic_string’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/string:52:0,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/basic_string.h:5111:5: note: candidate: template bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
> operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/basic_string.h:5111:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: mismatched types ‘const _CharT*’ and ‘char’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/ios_base.h:46:0,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/system_error:284:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
> operator==(const error_code& __lhs, const error_code& __rhs) noexcept
> ^~~~~~~~
> /usr/include/c++/6/system_error:284:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_code&’
> /usr/include/c++/6/system_error:289:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
> operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
> ^~~~~~~~
> /usr/include/c++/6/system_error:289:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_code&’
> /usr/include/c++/6/system_error:296:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
> operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
> ^~~~~~~~
> /usr/include/c++/6/system_error:296:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_condition&’
> /usr/include/c++/6/system_error:303:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
> operator==(const error_condition& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/system_error:303:3: note: no known conversion for argument 1 from ‘std::string {aka std::basic_string}’ to ‘const std::error_condition&’
> In file included from /usr/include/c++/6/bits/locale_facets.h:48:0,
> from /usr/include/c++/6/bits/basic_ios.h:37,
> from /usr/include/c++/6/ios:44,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/streambuf_iterator.h:204:5: note: candidate: template bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
> operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
> ^~~~~~~~
> /usr/include/c++/6/bits/streambuf_iterator.h:204:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/c++allocator.h:33:0,
> from /usr/include/c++/6/bits/allocator.h:46,
> from /usr/include/c++/6/string:41,
> from /usr/include/c++/6/bits/locale_classes.h:40,
> from /usr/include/c++/6/bits/ios_base.h:41,
> from /usr/include/c++/6/ios:42,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/ext/new_allocator.h:139:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
> operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
> ^~~~~~~~
> /usr/include/c++/6/ext/new_allocator.h:139:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const __gnu_cxx::new_allocator<_Tp>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:866:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
> operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:866:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’
> if (*p == lett[t])
> ^
> In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
> from /usr/include/c++/6/bits/char_traits.h:39,
> from /usr/include/c++/6/ios:40,
> from /usr/include/c++/6/ostream:38,
> from /usr/include/c++/6/iostream:39,
> from main.cpp:9:
> /usr/include/c++/6/bits/stl_iterator.h:859:5: note: candidate: template bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
> operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
> ^~~~~~~~
> /usr/include/c++/6/bits/stl_iterator.h:859:5: note: template argument deduction/substitution failed:
> main.cpp:32:29: note: ‘std::string {aka std::basic_string}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_IteratorL, _Container>’
if (*p == lett[t])
^
main.cpp: In function ‘int main()’:
main.cpp:72:23: error: cannot convert ‘std::string {aka std::basic_string}’ to ‘std::string* {aka std::basic_string*}’ for argument ‘1’ to ‘void dictionary(std::string*)’
dictionary(wordsin);
^)
以下的則是小弟的program。 望能得到指點一下。 因為是網上的simulator 來弄的,所以未能提供code 的cpp file, 望能見諒。
#include <iostream>
using namespace std;
int let [26];
char lett [] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
void dictionary(string *p)
{
int numwords = 0;
if (*p = NULL)
{
cout <<"nothing here are";
}
while (*p)
{
if(*p == ' ')
cout<<"2335";
int t =0;
int k =0;
while (k=0)
{
if (*p == lett[t])
{
if (t<25)
{
cout << lett[t+1];
}
else
{
cout <<lett [t-1];
}
++k;
}
else if (t<=25)
{
++t;
}
else
{
cout<<"Error occur";
break;
}
*p++;
}
}
}
int main()
{
for (int n=0;n<25;n++)
{
let[n] = n;
};
cout<<"please enter the word for changing password \n";
string wordsin;
cin>>wordsin;
dictionary(wordsin);
return 0;
}
null
void dictionary(string *p)
{
int numwords = 0;
if (*p = NULL)
{
cout <<"nothing here are";
}
// ...
}
當中的 *p = NULL
會把 Pointer p 指向的記憶體內容改成 NULL ,要做比較請改為 ==
。
BTW: 建議你去學一下 Markdown ,不然你的問題真的還蠻辣眼睛的...
#include <iostream>
using namespace std;
int let[26];
char lett[] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
void dictionary(string* p)
{
int numwords = 0;
// 使用 p == nullptr 來判斷 p 是否為空指針
if (p == nullptr) {
cout << "nothing here are";
return;
}
// 使用 p->empty() 來判斷是否已經到字串結尾
while (!p->empty()) {
// 使用 (*p)[0] 來取得字串的第一個字元
if((*p)[0] == ' ') {
cout << "2335";
}
int t = 0;
int k = 0;
while (k == 0)
{
if ((*p)[0] == lett[t])
{
if (t < 25)
{
cout << lett[t + 1];
}
else
{
cout << lett[t - 1];
}
++k;
}
else if (t <= 25)
{
++t;
}
else
{
cout << "Error occur";
break;
}
// 使用 p->erase(0, 1) 來移除字串的第一個字元
p->erase(0, 1);
}
}
}
int main()
{
for (int n = 0; n < 25; n++)
{
let[n] = n;
};
cout << "please enter the word for changing password \n";
string wordsin;
cin >> wordsin;
dictionary(&wordsin);
return 0;
}