Submission #3979084

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Source Code Expand

#include<iostream>
using namespace std;
int main(){
  string s;
  cin>>s;
  cout<<(s=='a'?"-1":'a')<<endl;
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:6:11: error: no match for ‘operator==’ (operand types are ‘std::string {aka std::basic_string<char>}’ and ‘char’)
   cout<<(s=='a'?"-1":'a')<<endl;
           ^
In file included from /usr/include/c++/5/iosfwd:40:0,
                 from /usr/include/c++/5/ios:38,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from ./Main.cpp:1:
/usr/include/c++/5/bits/postypes.h:216:5: note: candidate: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^
/usr/include/c++/5/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
./Main.cpp:6:13: note:   ‘std::string {aka std::basic_string<char>}’ is not derived from ‘const std::fpos<_StateT>’
   cout<<(s=='a'?"-1":'a')<<endl;
             ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:64:0...