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36 lines (29 sloc) 0.531 kb
#!/usr/bin/ruby
def hanoi(n,a,b,c)
if n-1 > 0
hanoi(n-1, a, c, b)
end
puts "Move disk %s to %s" % [a, b]
if n-1 > 0
hanoi(n-1, c, b, a)
end
end
i_args=ARGV.length
if i_args > 1
puts "*** Need number of disks or no parameter"
exit 1
end
n=3
if i_args > 0
begin
n = ARGV[0].to_i
rescue ValueError, msg:
print "** Expecting an integer, got: %s" % ARGV[0].to_s
exit 2
end
end
if n < 1 or n > 100
puts "*** number of disks should be between 1 and 100"
exit 2
end
hanoi(n, :a, :b, :c)
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