Compilare: user.cpp: In function 'void back(char)': user.cpp:31: warning: array subscript has type 'char' user.cpp:31: 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:47: warning: array subscript has type 'char' user.cpp:47: warning: array subscript has type 'char' user.cpp:47: 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:52: warning: array subscript has type 'char' user.cpp:56: warning: array subscript has type 'char' user.cpp:56: warning: array subscript has type 'char' user.cpp:56: warning: array subscript has type 'char' user.cpp:57: warning: array subscript has type 'char' user.cpp:68: warning: array subscript has type 'char' user.cpp:68: warning: array subscript has type 'char' user.cpp:68: warning: array subscript has type 'char' user.cpp:69: warning: array subscript has type 'char' user.cpp:73: warning: array subscript has type 'char' user.cpp:73: warning: array subscript has type 'char' user.cpp:77: warning: array subscript has type 'char' user.cpp:77: warning: array subscript has type 'char' user.cpp:77: warning: array subscript has type 'char' user.cpp:78: warning: array subscript has type 'char' user.cpp:89: warning: array subscript has type 'char' user.cpp:89: warning: array subscript has type 'char' user.cpp:89: warning: array subscript has type 'char' user.cpp:90: warning: array subscript has type 'char' user.cpp:94: warning: array subscript has type 'char' user.cpp:94: warning: array subscript has type 'char' user.cpp:98: warning: array subscript has type 'char' user.cpp:98: warning: array subscript has type 'char' user.cpp:98: warning: array subscript has type 'char' user.cpp:99: warning: array subscript has type 'char' user.cpp:110: warning: array subscript has type 'char' user.cpp:110: warning: array subscript has type 'char' user.cpp:110: warning: array subscript has type 'char' user.cpp:111: warning: array subscript has type 'char'