No, I use a different function:

enum difficulty(easy, moderate, hard, impossible);

...

int do_exam(difficulty level)
{
 struct my_knowledge *a;
 if ((a=(int*)malloc(sizeof(my_memory)*sizeof(time_studied)))!=NULL)
 {
   if (level<=moderate) return 1;
   else return 0;
 }
 else return 0;
 while (thinking_about_cheating) knock_himself_on_the_head_and_continue=1;
}