---

Lỗi biên dịch:

Main.cc: In function ‘int dem(int, int, int)’:
Main.cc:6:16: warning: ISO C++ forbids incrementing a pointer of type ‘int (*)(int, int, int)’ [-Wpointer-arith]
             dem++;
                ^~
Main.cc:6:16: error: lvalue required as increment operand
Main.cc:8:12: error: invalid conversion from ‘int (*)(int, int, int)’ to ‘int’ [-fpermissive]
     return dem;
            ^~~