x = mkdom ? 1 : 2;
printf("%d\n", x);
x = nil ? 1 : 2;
printf("%d\n", x);
x = 0 ? 1 : 2;
printf("%d\n", x);
if(mkdom)
	printf("functions are not false\n");
if(nil)
	printf("nil is not false\n");
else
	printf("nil is false\n");