Eroare de compilare: user.cpp:11:14: error: ‘double y1’ redeclared as different kind of symbol double x1,x2,y1,y2,r1,r2; ^ 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/iostream: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:19:10: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ f>>x1>>y1>>r1>>x2>>y2>>r2; ^ In file included from /usr/include/c++/4.8/iostream:40:0, 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:20:58: error: cannot convert ‘double (*)(double)throw ()’ to ‘double’ for argument ‘1’ to ‘double fabs(double)’ double l=pow(pow(fabs(x1)-fabs(x2),2)+pow(fabs(y1)-fabs(y2),2),0.5); ^ user.cpp:21:24: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator==’ if(x1==x2&&y1==y2&&r1==r2)g<<-1<<'\n'; ^ user.cpp:23:24: error: invalid operands of types ‘double(double)throw ()’ and ‘double’ to binary ‘operator==’ if(x1==x2&&y1==y2||l>r1+r2)g<<-2<<'\n'; ^