Compilare: user.cpp: In function 'void add(char*, int)': user.cpp:15: warning: array subscript has type 'char' user.cpp:20: warning: array subscript has type 'char' user.cpp:22: warning: array subscript has type 'char' user.cpp: In function 'void remove(char*, int)': user.cpp:31: warning: array subscript has type 'char' user.cpp:40: 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: In function 'int count(char*, int)': user.cpp:52: warning: array subscript has type 'char' user.cpp: In function 'int share(char*, int)': user.cpp:67: warning: array subscript has type 'char'