Eroare de compilare: user.cpp:6:15: error: ‘int y1’ redeclared as different kind of symbol int n,m,x1,x2,y1,y2,nn,mm,i,j,v[205][205],nr,c,j1,j2,alb,k,dx[]={-1,-1,0,1,1,1,0,-1},dy[]={0,1,1,1,0,-1,-1,-1,-1},mare,sup[205][205]; ^ 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:6:48: error: ‘int j1’ redeclared as different kind of symbol int n,m,x1,x2,y1,y2,nn,mm,i,j,v[205][205],nr,c,j1,j2,alb,k,dx[]={-1,-1,0,1,1,1,0,-1},dy[]={0,1,1,1,0,-1,-1,-1,-1},mare,sup[205][205]; ^ 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:240:1: error: previous declaration of ‘double j1(double)’ __MATHCALL (j1,, (_Mdouble_)); ^ user.cpp: In function ‘int main()’: user.cpp:38:10: error: cannot bind ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ lvalue to ‘std::basic_istream<char>&&’ f>>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:41:15: warning: pointer to a function used in arithmetic [-Wpointer-arith] y1=y1+mm+1; ^ user.cpp:41:18: warning: pointer to a function used in arithmetic [-Wpointer-arith] y1=y1+mm+1; ^ user.cpp:41:11: error: assignment of function ‘double y1(double)’ y1=y1+mm+1; ^ user.cpp:41:11: error: cannot convert ‘double (*)(double)throw ()’ to ‘double(double)throw ()’ in assignment user.cpp:45:15: error: assignment of function ‘double j1(double)’ for(j1=x1;j1<=x2;++j1) ^