---

Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:8:9: error: ‘scanf’ was not declared in this scope
    8 |         scanf("%d", &n);
      |         ^~~~~
Main.cc:10:5: error: ‘printf’ was not declared in this scope
   10 |     printf("%d", boolen(n));
      |     ^~~~~~
Main.cc:4:1: note: ‘printf’ is defined in header ‘’; did you forget to ‘#include ’?
    3 | #include 
  +++ |+#include 
    4 | int boolen (int n);