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#変数宣言
nisin = Array.new(16)
#入力
print "10進数を入力:"
jyu = gets.to_i
#変換
for i in 0 .. (nisin.size-1)
nisin[i] = jyu % 2
jyu = jyu / 2
end
#出力
(nisin.size-1) . downto(0) do |i|
print nisin[i]
end
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