Compilare: user.cpp: In function 'int main()': user.cpp:13: warning: array subscript has type 'char' user.cpp:13: warning: array subscript has type 'char' user.cpp:13: warning: array subscript has type 'char' user.cpp:13: warning: array subscript has type 'char' user.cpp:15: warning: name lookup of 'a' changed user.cpp:2: warning: matches this 'a' under ISO standard rules user.cpp:9: warning: matches this 'a' under old rules