#!/usr/koeki/bin/ruby
#coding: euc-jp

STDERR.print("16 進数の数字: ")

bse = 16
bse2 = 2
STDERR.printf("%d進数を%d進数に変換します。終了はq\n", bse, bse2)
i = 0      # 桁をいれる
bin = 0    # 2 進数変換の値
while true
  STDERR.printf("%d桁目:", i+1)
  m = gets.chomp        # 桁の数
  if m == "q"
    break
  elsif m == "a"
    m = 10
  elsif m == "b"
    m = 11
  elsif m == "c"
    m = 12
  elsif m == "d"
    m = 13
  elsif m == "e"
    m = 14
  elsif m == "f"
    m = 15
  end
  m = m.to_i
  bin += m * bse ** i  # まず 10 進数に変換
  i += 1
end

n = bin
while n > 1
  printf("%d\n",n % bse2)
  n = n / bse2
end
printf("%d\n",n)

print("下から上に向かって読みます\n")