Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:5:1: error: ‘cin’ was not declared in this scope cin>>a>>b; // citeste numerele a si b ^ user.cpp:11:1: error: ‘cout’ was not declared in this scope cout<<a<<"\n"; // afiseaza a ^ user.cpp:12:17: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result] system ("pause"); ^