Towers of Hanoi: Difference between revisions
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=={{header|REXX}}== |
=={{header|REXX}}== |
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===simple text moves=== |
===simple text moves=== |
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<lang rexx>/*REXX program |
<lang rexx>/*REXX program displays the moves to solve the Tower of Hanoi (with N disks). */ |
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parse arg N . /*get optional number of disks from CL.*/ |
parse arg N . /*get optional number of disks from CL.*/ |
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if N=='' then N=3 /*Not |
if N=='' | N=="," then N=3 /*Not specified? Then use the default.*/ |
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#=0 |
#=0 /*#: the number of disk moves (so far)*/ |
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z=2**N - 1 /*Z: " " " minimum # of moves.*/ |
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call mov 1, 3, N /*move the top disk, then recurse ··· */ |
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say |
say |
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say 'The minimum number of moves to solve a ' N"-disk Tower of Hanoi is " z |
say 'The minimum number of moves to solve a ' N"-disk Tower of Hanoi is " z |
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exit /*stick a fork in it, we're all done. */ |
exit /*stick a fork in it, we're all done. */ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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/*────────────────────────────────────────────────────────────────────────────*/ |
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dsk: #=#+1 /*bump the (disk) move counter by one. */ |
dsk: #=#+1 /*bump the (disk) move counter by one. */ |
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say 'step' right(#,length(z))": move disk on tower" arg(1) '───►' arg(2) |
say 'step' right(#, length(z))": move disk on tower" arg(1) '───►' arg(2) |
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return /* [↑] display the move message (text)*/ |
return /* [↑] display the move message (text)*/ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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/*────────────────────────────────────────────────────────────────────────────*/ |
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mov: procedure expose # z; parse arg @1, @2, @3 |
mov: procedure expose # z; parse arg @1, @2, @3 |
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if @3==1 then call dsk @1, @2 |
if @3==1 then call dsk @1, @2 |
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else do |
else do; call mov @1, 6-@1-@2, @3-1 |
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call mov @1, |
call mov @1, @2, 1 |
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call mov @1, |
call mov 6-@1-@2, @2, @3-1 |
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call mov 6-@1-@2, @2, @3-1 |
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end |
end |
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return</lang> |
return</lang> |
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