Compilare: user.cpp: In function 'void calc(int)': user.cpp:16: warning: array subscript has type 'char' user.cpp:31: warning: array subscript has type 'char' user.cpp:44: warning: array subscript has type 'char' user.cpp:56: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:101: warning: array subscript has type 'char' user.cpp:101: warning: array subscript has type 'char' user.cpp:104: warning: array subscript has type 'char' user.cpp:104: warning: array subscript has type 'char'