Compilare: user.cpp: In function ‘int eval()’: user.cpp:19: warning: array subscript has type ‘char’ user.cpp:19: warning: array subscript has type ‘char’ user.cpp:20: warning: array subscript has type ‘char’ user.cpp: In function ‘int t()’: user.cpp:37: warning: array subscript has type ‘char’ user.cpp:37: warning: array subscript has type ‘char’ user.cpp:38: warning: array subscript has type ‘char’ user.cpp: In function ‘int f()’: user.cpp:55: warning: array subscript has type ‘char’ user.cpp:65: warning: array subscript has type ‘char’ user.cpp:65: warning: array subscript has type ‘char’ user.cpp:67: warning: array subscript has type ‘char’