Compilare: user.cpp:30:3: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:19: warning: name lookup of 'i' changed user.cpp:5: warning: matches this 'i' under ISO standard rules user.cpp:12: warning: matches this 'i' under old rules user.cpp:20: warning: name lookup of 'j' changed user.cpp:5: warning: matches this 'j' under ISO standard rules user.cpp:17: warning: matches this 'j' under old rules