Eroare de compilare: user.cpp:5:23: error: ‘long long int y1’ redeclared as different kind of symbol long long x1,x2,x3,x4,y1,y2,y3,y4; ^ In file included from /usr/include/features.h:357:0, from /usr/include/assert.h:37, from /usr/include/c++/4.8/cassert:43, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:33, 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 ‘bool arie()’: user.cpp:9:36: error: invalid operands of types ‘long long int’ and ‘double(double)throw ()’ to binary ‘operator-’ long long a1=x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2); // ABC ^ user.cpp:9:47: warning: pointer to a function used in arithmetic [-Wpointer-arith] long long a1=x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2); // ABC ^ user.cpp:9:49: error: invalid operands of types ‘long long int’ and ‘double (*)(double)throw ()’ to binary ‘operator*’ long long a1=x1*(y2-y3)+x2*(y3-y1)+x3*(y1-y2); // ABC ^ user.cpp:10:36: error: invalid operands of types ‘long long int’ and ‘double(double)throw ()’ to binary ‘operator-’ long long a2=x1*(y2-y4)+x2*(y4-y1)+x4*(y1-y2); // ABD ^ user.cpp:10:47: warning: pointer to a function used in arithmetic [-Wpointer-arith] long long a2=x1*(y2-y4)+x2*(y4-y1)+x4*(y1-y2); // ABD ^ user.cpp:10:49: error: invalid operands of types ‘long long int’ and ‘double (*)(double)throw ()’ to binary ‘operator*’ long long a2=x1*(y2-y4)+x2*(y4-y1)+x4*(y1-y2); // ABD ^ user.cpp:11:36: error: invalid operands of types ‘long long int’ and ‘double(double)throw ()’ to binary ‘operator-’ long long a3=x1*(y2-y4)+x3*(y4-y1)+x4*(y1-y3); // ACD ^ user.cpp:11:47: warning: pointer to a function used in arithmetic [-Wpointer-arith] long long a3=x1*(y2-y4)+x3*(y4-y1)+x4*(y1-y3); // ACD ^ user.cpp:11:49: error: invalid operands of types ‘long long int’ and ‘double (*)(double)throw ()’ to binary ‘operator*’ long long a3=x1*(y2-y4)+x3*(y4-y1)+x4*(y1-y3); // ACD ^ user.cpp: In function ‘int main()’: user.cpp:26:10: 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>>x3>>y3>>x4>>y4; ^ In file included from /usr/include/c++/4.8/sstream:38:0, from /usr/include/c++/4.8/complex:45, from /usr/include/c++/4.8/ccomplex:38, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, 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)