Compilare: user.cpp: In function 'void back()': user.cpp:11: warning: array subscript has type 'char' user.cpp: In function 'int main()': 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: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: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: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: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: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: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:38: warning: array subscript has type 'char'