Compilare: user.cpp: In function 'int transf()': user.cpp:37: warning: array subscript has type 'char' user.cpp:37: warning: array subscript has type 'char' user.cpp: In function 'int eval()': user.cpp:59: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:180: warning: array subscript has type 'char' user.cpp:181: warning: array subscript has type 'char' user.cpp:182: warning: array subscript has type 'char' user.cpp:183: warning: array subscript has type 'char' user.cpp:195: warning: array subscript has type 'char' user.cpp:195: warning: array subscript has type 'char' user.cpp:203: warning: array subscript has type 'char' user.cpp:203: warning: array subscript has type 'char' user.cpp: In function 'int transf()': user.cpp:50: warning: control reaches end of non-void function