View Compilation Error

0_0_20393073_4061.cpp: In function 'int main()':
0_0_20393073_4061.cpp:21:16: error: cannot bind 'std::istream {aka std::basic_istream<char>}' lvalue to 'std::basic_istream<char>&&'
     while(cin>>a>>b)
                ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:40:0,
                 from 0_0_20393073_4061.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:872:5: note: initializing argument 1 of 'std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = long long int [10100]]'
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^
0_0_20393073_4061.cpp:21:19: error: 'b' was not declared in this scope
     while(cin>>a>>b)
                   ^