Eroare de compilare: user.cpp:3:2: error: invalid preprocessing directive #inlcude user.cpp:30:2: warning: no newline at end of file user.cpp:7: error: expected constructor, destructor, or type conversion before '<' token user.cpp: In function 'int main()': user.cpp:16: error: 'a' was not declared in this scope user.cpp:20: error: 'a' was not declared in this scope user.cpp:26: error: 'a' was not declared in this scope