Eroare de compilare: user.cpp:42:11: error: ‘double y1’ redeclared as different kind of symbol double x1,y1,x0,y0,xi,yi,sol; ^ In file included from /usr/include/features.h:357:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/os_defines.h:39, from /usr/include/i386-linux-gnu/c++/4.8/bits/c++config.h:420, from /usr/include/c++/4.8/iosfwd:38, from /usr/include/c++/4.8/ios:38, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/i386-linux-gnu/bits/mathcalls.h:243:1: error: previous declaration of ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp:42:17: error: ‘double y0’ redeclared as different kind of symbol double x1,y1,x0,y0,xi,yi,sol; ^ In file included from /usr/include/features.h:357:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/os_defines.h:39, from /usr/include/i386-linux-gnu/c++/4.8/bits/c++config.h:420, from /usr/include/c++/4.8/iosfwd:38, from /usr/include/c++/4.8/ios:38, from /usr/include/c++/4.8/istream:38, from /usr/include/c++/4.8/fstream:38, from user.cpp:1: /usr/include/i386-linux-gnu/bits/mathcalls.h:242:1: error: previous declaration of ‘double y0(double)’ __MATHCALL (y0,, (_Mdouble_)); ^ user.cpp: In function ‘int main()’: user.cpp:47:13: error: assignment of function ‘double y0(double)’ x0=xi;y0=yi; ^ user.cpp:47:13: error: cannot convert ‘double’ to ‘double(double)throw ()’ in assignment user.cpp:50:12: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ fin>>x1>>y1; ^ In file included from /usr/include/c++/4.8/fstream:38:0, from user.cpp:1: /usr/include/c++/4.8/istream:872:5: 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 ()]’ operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x) ^ user.cpp:51:32: error: no matching function for call to ‘trapez::trapez(double&, double (&)(double)throw (), double&, double (&)(double)throw ())’ sol+=trapez(x0,y0,x1,y1).aria(); ^ user.cpp:51:32: note: candidates are: user.cpp:31:5: note: trapez::trapez(double, double, double, double) trapez(double x1,double y1,double x2,double y2) ^ user.cpp:31:5: note: no known conversion for argument 2 from ‘double(double)throw ()’ to ‘double’ user.cpp:27:5: note: trapez::trapez(punct, punct)