prog.cpp:66:63: error: invalid user-defined conversion from ‘std::istream {aka std::basic_istream<char>}’ to ‘char*’ [-fpermissive]
In file included from /usr/include/c++/4.7/ios:45:0,
                 from /usr/include/c++/4.7/ostream:40,
                 from /usr/include/c++/4.7/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/basic_ios.h:113:7: note: candidate is: std::basic_ios<_CharT, _Traits>::operator void*() const [with _CharT = char; _Traits = std::char_traits<char>] <near match>
/usr/include/c++/4.7/bits/basic_ios.h:113:7: note:   no known conversion for implicit ‘this’ parameter from ‘void*’ to ‘char*’

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