View Compilation Error

25481_0_17369.cpp: In function `int main()':
25481_0_17369.cpp:11: error: ambiguous overload for 'operator>>' in '(&std::cin)->std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>](((int&)(&a))) >> " "'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/istream:692: note: candidates are: std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*) [with _Traits = std::char_traits<char>] <near match>
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/istream:687: note:                 std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*) [with _Traits = std::char_traits<char>] <near match>
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