Compilare: user.cpp:58:2: warning: no newline at end of file user.cpp: In function 'void back(int)': user.cpp:25: warning: name lookup of 'i' changed user.cpp:2: warning: matches this 'i' under ISO standard rules user.cpp:17: warning: matches this 'i' under old rules user.cpp: In function 'int main()': user.cpp:48: warning: format '%d' expects type 'int*', but argument 2 has type 'long int*' user.cpp:48: warning: format '%d' expects type 'int*', but argument 3 has type 'long int*'