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Deadfish interpreter written in Ruby (http://esolangs.org/wiki/Deadfish)
#!/usr/bin/env ruby
n = 0
while true
print '>> '
gets.chomp.each_char do |c|
n = 0 if [-1, 256].include?(n)
case c
when 'd' then n -= 1
when 'i' then n += 1
when 'o' then puts n
when 's' then n *= n
end
end
end
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