Eroare de compilare: user.cpp:1:21: error: iostream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:5: error: ‘cin’ was not declared in this scope user.cpp:6: error: ‘i’ was not declared in this scope user.cpp:24: error: ‘cout’ was not declared in this scope user.cpp:27: error: ‘cout’ was not declared in this scope user.cpp:4: warning: unused variable ‘u’