1 // Towers of Hanoi in Fun

     2 

     3 def hanoi(n: Int, a: Int, b: Int, c: Int) : Void =

     4   if n != 0 then {

     5     hanoi(n - 1, a, c, b);

     6     print_int(a);

     7     print_char('-'); print_char('>'); // prints out "->"

     8     print_int(b);

     9     print_char('\n');

    10     hanoi(n - 1, c, b, a)

    11   } else skip;

    12 

    13 hanoi(4,1,2,3)