Eroare de compilare: user.cpp:7:18: error: ‘int y1’ redeclared as different kind of symbol int n,m,xp,yp,x1,y1,x2,y2,i,y1i,y2i,dx,dy,xf,yf; ^ 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:15:14: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ f>>xp>>yp>>x1>>y1>>x2>>y2; ^ 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:16:12: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] if (y1>y2) ^ user.cpp:19:12: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘int’ [-fpermissive] y2i=y1; ^ user.cpp:23:12: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘int’ [-fpermissive] y1i=y1; ^ user.cpp:31:10: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘int’ [-fpermissive] m=y1; ^ user.cpp:32:11: error: assignment of function ‘double y1(double)’ y1=y2; ^ user.cpp:32:11: error: cannot convert ‘int’ to ‘double(double)throw ()’ in assignment