Compilare: user.cpp: In function 'int main()': user.cpp:30: warning: array subscript has type 'char' user.cpp:31: warning: array subscript has type 'char' user.cpp:33: warning: array subscript has type 'char' user.cpp:41: warning: array subscript has type 'char' user.cpp:42: warning: array subscript has type 'char' user.cpp:48: warning: format '%d' expects type 'int', but argument 2 has type 'long unsigned int'