Eroare de compilare: user.cpp:12:14: error: ‘double y1’ redeclared as different kind of symbol double x1,x2,y1,y2,xm,ym,t,ar,ang,xx,yy; ^ 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: In function ‘int main()’: user.cpp:22:15: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ in>>x1>>y1>>x2>>y2; ^ 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:23:33: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator+’ xm=(x1+x2)/2,ym=(y1+y2)/2; ^ user.cpp:24:36: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator-’ t=((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))/4; ^ user.cpp:24:44: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator-’ t=((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2))/4; ^ user.cpp:27:29: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator-’ x1-=xm,x2-=xm,y1-=ym,y2-=ym; ^ user.cpp:27:29: error: in evaluation of ‘operator-=(double(double)throw (), double)’ user.cpp:28:27: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator/’ x1/=t,x2/=t,y1/=t,y2/=t; ^ user.cpp:28:27: error: in evaluation of ‘operator/=(double(double)throw (), double)’