Borderou de evaluare (job #413961)

Eroare de compilare: user.cpp:7:18: error: ‘float y1’ redeclared as different kind of symbol /usr/include/i386-linux-gnu/bits/mathcalls.h:243:1: error: previous declaration of ‘double y1(double)’ user.cpp: In function ‘int main()’: user.cpp:10:18: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ /usr/include/c++/4.6/istream:852:5: error: 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 = double(double)throw ()]’ user.cpp:19:33: error: invalid operands of types ‘double(double)throw ()’ and ‘float’ to binary ‘operator-’