Compilare: user.cpp: In function 'void back(char)': user.cpp:32: warning: array subscript has type 'char' user.cpp:32: 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:37: warning: array subscript has type 'char' user.cpp:48: warning: array subscript has type 'char' user.cpp:48: warning: array subscript has type 'char' user.cpp:48: warning: array subscript has type 'char' user.cpp:49: warning: array subscript has type 'char' user.cpp:53: warning: array subscript has type 'char' user.cpp:53: warning: array subscript has type 'char' user.cpp:57: warning: array subscript has type 'char' user.cpp:57: warning: array subscript has type 'char' user.cpp:57: warning: array subscript has type 'char' user.cpp:58: warning: array subscript has type 'char' user.cpp:69: warning: array subscript has type 'char' user.cpp:69: warning: array subscript has type 'char' user.cpp:69: warning: array subscript has type 'char' user.cpp:70: warning: array subscript has type 'char' user.cpp:74: warning: array subscript has type 'char' user.cpp:74: warning: array subscript has type 'char' user.cpp:78: warning: array subscript has type 'char' user.cpp:78: warning: array subscript has type 'char' user.cpp:78: warning: array subscript has type 'char' user.cpp:79: warning: array subscript has type 'char' user.cpp:90: warning: array subscript has type 'char' user.cpp:90: warning: array subscript has type 'char' user.cpp:90: warning: array subscript has type 'char' user.cpp:91: warning: array subscript has type 'char' user.cpp:95: warning: array subscript has type 'char' user.cpp:95: warning: array subscript has type 'char' user.cpp:99: warning: array subscript has type 'char' user.cpp:99: warning: array subscript has type 'char' user.cpp:99: warning: array subscript has type 'char' user.cpp:100: warning: array subscript has type 'char' user.cpp:111: warning: array subscript has type 'char' user.cpp:111: warning: array subscript has type 'char' user.cpp:111: warning: array subscript has type 'char' user.cpp:112: warning: array subscript has type 'char'