Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:13: error: ‘G’ was not declared in this scope user.cpp:14: error: ‘i’ was not declared in this scope user.cpp:16: error: ‘f1’ was not declared in this scope user.cpp:19: error: invalid operands of types ‘int’ and ‘const char [4]’ to binary ‘operator<<’ user.cpp:27: error: ‘energie’ was not declared in this scope user.cpp:38: error: request for member ‘close’ in ‘g’, which is of non-class type ‘int’