Compilare: user.cpp: In function 'void add(char*)': user.cpp:23: warning: array subscript has type 'char' user.cpp:25: warning: array subscript has type 'char' user.cpp:26: warning: array subscript has type 'char' user.cpp:28: warning: array subscript has type 'char' user.cpp: In function 'void del(char*, node*)': user.cpp:44: warning: array subscript has type 'char' user.cpp:48: warning: array subscript has type 'char' user.cpp:52: warning: array subscript has type 'char' user.cpp: In function 'int count(char*)': user.cpp:63: warning: array subscript has type 'char' user.cpp:65: warning: array subscript has type 'char' user.cpp: In function 'int comm(char*)': user.cpp:80: warning: array subscript has type 'char' user.cpp:83: warning: array subscript has type 'char'