Eroare de compilare: user.cpp:5: error: ‘usig’ does not name a type user.cpp: In function ‘int main()’: user.cpp:9: error: ‘ifstream’ was not declared in this scope user.cpp:9: error: expected ‘;’ before ‘cin’ user.cpp:10: error: ‘ofstream’ was not declared in this scope user.cpp:10: error: expected ‘;’ before ‘cout’ user.cpp:11: error: ‘cin’ was not declared in this scope user.cpp:13: error: ‘cout’ was not declared in this scope user.cpp:15: error: ‘system’ was not declared in this scope