Compilare: user.cpp: In function 'int transf()': user.cpp:36: warning: array subscript has type 'char' user.cpp:36: warning: array subscript has type 'char' user.cpp: In function 'int eval()': user.cpp:58: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:179: warning: array subscript has type 'char' 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:194: warning: array subscript has type 'char' user.cpp:194: warning: array subscript has type 'char' user.cpp:200: warning: array subscript has type 'char' user.cpp:200: warning: array subscript has type 'char' user.cpp: In function 'int transf()': user.cpp:49: warning: control reaches end of non-void function