Eroare de compilare: user.cpp: In function 'int main()': user.cpp:7: error: 'x' was not declared in this scope user.cpp:7: error: 'y' was not declared in this scope user.cpp:9: error: 'i' was not declared in this scope user.cpp:9: error: 'n' was not declared in this scope user.cpp:12: error: 'j' was not declared in this scope user.cpp:15: error: 'f1' was not declared in this scope user.cpp:15: error: expected `;' before ':' token user.cpp:21: error: 'e1' was not declared in this scope user.cpp:22: error: 'k' was not declared in this scope user.cpp:22: error: 'e2' was not declared in this scope user.cpp:25: error: 'f1' was not declared in this scope user.cpp:25: error: 'e1' was not declared in this scope user.cpp:26: error: 'k' was not declared in this scope user.cpp:28: error: expected primary-expression before ')' token user.cpp:28: error: expected `;' before ')' token