Eroare de compilare: user.cpp:13:15: error: ‘int y1’ redeclared as different kind of symbol int n,m,x1,x2,y1,y2; ^ In file included from /usr/include/features.h:346:0, from /usr/local/include/c++/4.8.0/i686-pc-linux-gnu/bits/os_defines.h:39, from /usr/local/include/c++/4.8.0/i686-pc-linux-gnu/bits/c++config.h:420, from /usr/local/include/c++/4.8.0/iosfwd:38, from /usr/local/include/c++/4.8.0/ios:38, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/include/bits/mathcalls.h:242:1: error: previous declaration of ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp: In function ‘int main()’: user.cpp:18:12: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ f>>n>>m>>x1>>y1>>x2>>y2; ^ In file included from /usr/local/include/c++/4.8.0/fstream:38:0, from user.cpp:1: /usr/local/include/c++/4.8.0/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:22:19: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘int’ [-fpermissive] for (int j=y1; j<=y1+m-1; ++j) ^ user.cpp:22:29: warning: pointer to a function used in arithmetic [-Wpointer-arith] for (int j=y1; j<=y1+m-1; ++j) ^ user.cpp:22:31: warning: pointer to a function used in arithmetic [-Wpointer-arith] for (int j=y1; j<=y1+m-1; ++j) ^ user.cpp:22:31: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]