文字を数えるときに奇妙なコンパイラエラー

Question

文字列中の文字の出現を合計するprograを作ったが、私は理解できない奇妙なエラーが出る。

#include <iostream> 
#include <string> 
#include <vector> 
#include <algorithm> 
using namespace std; 

int main() 
{ 
    int sum=0; 
    string sir; 
    vector<int> num; 
    vector<std::string> letters{"a","b","c","d","e","f","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"}; 
    getline(cin,sir); 
    for(int i = 0; i < letters.size(); i++) { 
     sum = std::count(sir.begin(),sir.end(), letters[i]); 

    num.push_back(sum); 
    sum=0; 
    } 
    return 0; 
} 

エラーAR

、ここで：sirの

c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_algo.h||In function 'typename std::iterator_traits<_InputIterator>::difference_type std::count(_IIter, _IIter, const _Tp&) [with _IIter = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >, _Tp = std::basic_string<char>, typename std::iterator_traits<_InputIterator>::difference_type = int]':| 
E:\c\Watermelon\main.cpp:15|58|instantiated from here| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_algo.h|4591|error: no match for 'operator==' in '__first.__gnu_cxx::__normal_iterator<_Iterator, _Container>::operator* [with _Iterator = char*, _Container = std::basic_string<char>, __gnu_cxx::__normal_iterator<_Iterator, _Container>::reference = char&]() == __value'| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_algo.h|4591|note: candidates are:| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\functional|2233|note: template<class _Res, class ... _Args> bool std::operator==(std::nullptr_t, const std::function<_Res(_ArgTypes ...)>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\functional|2227|note: template<class _Res, class ... _Args> bool std::operator==(const std::function<_Res(_ArgTypes ...)>&, std::nullptr_t)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\tuple|575|note: template<class ... _TElements, class ... _UElements> bool std::operator==(const std::tuple<_TElements ...>&, const std::tuple<_Elements ...>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|5322|note: template<class _RealType> bool std::operator==(const std::piecewise_linear_distribution<_RealType>&, const std::piecewise_linear_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|5080|note: template<class _RealType> bool std::operator==(const std::piecewise_constant_distribution<_RealType>&, const std::piecewise_constant_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|4841|note: template<class _IntType> bool std::operator==(const std::discrete_distribution<_IntType>&, const std::discrete_distribution<_IntType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|4609|note: template<class _RealType> bool std::operator==(const std::extreme_value_distribution<_RealType>&, const std::extreme_value_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|4434|note: template<class _RealType> bool std::operator==(const std::weibull_distribution<_RealType>&, const std::weibull_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|4259|note: template<class _RealType> bool std::operator==(const std::exponential_distribution<_RealType>&, const std::exponential_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|2459|note: template<class _RealType1> bool std::operator==(const std::gamma_distribution<_RealType>&, const std::gamma_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|3715|note: template<class _IntType> bool std::operator==(const std::geometric_distribution<_IntType>&, const std::geometric_distribution<_IntType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.tcc|1684|note: template<class _RealType1> bool std::operator==(const std::normal_distribution<_RealType>&, const std::normal_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|3337|note: bool std::operator==(const std::bernoulli_distribution&, const std::bernoulli_distribution&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|3337|note: no known conversion for argument 1 from 'char' to 'const std::bernoulli_distribution&'| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|2798|note: template<class _RealType> bool std::operator==(const std::cauchy_distribution<_RealType>&, const std::cauchy_distribution<_RealType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|1906|note: template<class _IntType> bool std::operator==(const std::uniform_real_distribution<_IntType>&, const std::uniform_real_distribution<_IntType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\random.h|1725|note: template<class _IntType> bool std::operator==(const std::uniform_int_distribution<_IntType>&, const std::uniform_int_distribution<_IntType>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_vector.h|1273|note: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\streambuf_iterator.h|194|note: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\basic_string.h|2460|note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\basic_string.h|2448|note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\basic_string.h|2434|note: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\basic_string.h|2427|note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\allocator.h|127|note: template<class _Tp> bool std::operator==(const std::allocator<_Tp1>&, const std::allocator<_Tp1>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\allocator.h|122|note: template<class _T1, class _T2> bool std::operator==(const std::allocator<_T1>&, const std::allocator<_T2>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_iterator.h|1031|note: template<class _Iterator> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_iterator.h|1025|note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_iterator.h|335|note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::reverse_iterator<_IteratorL>&, const std::reverse_iterator<_IteratorR>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_iterator.h|285|note: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_pair.h|201|note: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\postypes.h|218|note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\ext\new_allocator.h|123|note: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_iterator.h|805|note: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)| 
c:\mingw\bin\..\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_iterator.h|799|note: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)| 
||=== Build finished: 36 errors, 0 warnings ===| 

Answer 1

value_typecharですが、letters[i]はstd::stringです。文字列とcharを比較することはできません。代わりに次の方法を試してみてください。

vector<char> letters{'a','b','c','d','e','f','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'}; 

Answer 2

これは宿題です。

あなたはやや複雑です。以下を試してください

1. すべての値をゼロに初期化してください。
2. 行を取得します。
3. 各文字を順番に表示します。それを小文字にします。 a-zの間をチェックしてください。変換A-> 0、B-> 1など
4. インクリメントあなたはその行で見つかった文字に対応する数と配列をプリントアウトすることができます1

で作成された配列内の対応する整数。