Compilare: user.cpp: In function 'void back(char, char, char, int)': user.cpp:31: warning: array subscript has type 'char' user.cpp:31: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:32: warning: array subscript has type 'char' user.cpp:34: warning: array subscript has type 'char' user.cpp:34: warning: array subscript has type 'char' user.cpp:34: warning: array subscript has type 'char' user.cpp:35: warning: array subscript has type 'char' user.cpp:35: warning: array subscript has type 'char' user.cpp:35: warning: array subscript has type 'char' user.cpp:36: warning: array subscript has type 'char' user.cpp:36: warning: array subscript has type 'char' user.cpp:36: warning: array subscript has type 'char' user.cpp:38: warning: array subscript has type 'char' user.cpp:38: warning: array subscript has type 'char' user.cpp:38: warning: array subscript has type 'char' user.cpp:39: warning: array subscript has type 'char' user.cpp:39: warning: array subscript has type 'char' user.cpp:40: warning: array subscript has type 'char' user.cpp:40: warning: array subscript has type 'char'