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View Compilation Error

0_0_31842960_16097.cpp: In function 'int main()':
0_0_31842960_16097.cpp:15:20: error: no matching function for call to 'std::basic_istream<char>::getline(std::istream&, std::string&)'
   cin.getline(cin,a);
                    ^
0_0_31842960_16097.cpp:15:20: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:40:0,
                 from 0_0_31842960_16097.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:618:5: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize, std::basic_istream<_CharT, _Traits>::char_type) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long long int]
     basic_istream<char>::
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:618:5: note:   candidate expects 3 arguments, 2 provided
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:427:7: note: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long long int]
       getline(char_type* __s, streamsize __n)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:427:7: note:   no known conversion for argument 2 from 'std::string {aka std::basic_string<char>}' to 'std::streamsize {aka long long int}'
0_0_31842960_16097.cpp:21:26: error: 'strlen' was not declared in this scope
    for(int i=1;i<strlen(a);i++)
                          ^


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