Revision 0e21c1db877c1e7cb601aa079331d47076b47d30 authored by jeremycowles on 26 April 2009, 01:16:52 UTC, committed by jeremycowles on 26 April 2009, 01:16:52 UTC
Removed a dbprint statement in the evaluator. git-svn-id: https://svn.code.sf.net/p/ucblogo/code@223 fc4ef4ee-df3e-0410-84de-fb01f5d6c4f7
1 parent 8b6be6c
tower
program tower;
{This program solves the 5-disk tower of hanoi problem.}
procedure hanoi(number:integer;from,onto,other:char);
{Recursive procedure that solves a subproblem of the original problem,
moving some number of disks, not necessarily 5. To move n disks, it
must get the topmost n-1 out of the way, move the nth to the target
stack, then move the n-1 to the target stack.}
procedure movedisk(number:integer;from,onto:char);
{This procedure moves one single disk. It assumes that the move is
legal, i.e., the disk is at the top of its stack and the target stack
has no smaller disks already. Procedure hanoi is responsible for
making sure that's all true.}
begin {movedisk}
writeln('Move disk ',number:1,' from ',from,' to ',onto)
end; {movedisk}
begin {hanoi}
if number <> 0 then
begin
hanoi(number-1,from,other,onto);
movedisk(number,from,onto);
hanoi(number-1,other,onto,from)
end
end; {hanoi}
begin {main program}
hanoi(5,'a','b','c')
end.
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