// messed_up.c - don't write code like this!
//   cc -std=c89 messed_up.c    - no warnings
//   cc -std=c11 messed_up.c    - many warnings
#include <stdio.h>
main()
{
   int a = f() + f(8, 9, 10);
   printf("a = %d\n", a);

   return 0;
}

f(int b) 
{
   return b;
}