November 2017
Beginner to intermediate
344 pages
7h 2m
Chinese
Content preview from 深入理解運算原理｜從簡單的機器到無所不能的程式
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不可能的程式
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271
>> number = 9796543849500706521102980495717740021834791
=> 9796543849500706521102980495717740021834791
>> bytes_in_binary = number.to_s(2).scan(/.+?(?=.{8}*\z)/)
=> ["1110000", "01110101", "01110100", "01110011", "00100000", "00100111",
"01101000", "01100101", "01101100", "01101100", "01101111", "00100000",
"01110111", "01101111", "01110010", "01101100", "01100100", "00100111"]
>> program = bytes_in_binary.map { |string| string.to_i(2).chr }.join
=> "puts 'hello world'"
>> eval program
hello world
=> nil
當然，這個將程式編碼成大型數值的配置架構，就是能存入磁碟、透過 Internet 傳送、
送到 Ruby 直譯器（這本身就是磁碟裡的大型數值！），然後讓特定運算得以發生。
由於每個 Ruby 程式都有一個唯一的數值，因此我們可以自動產生所有可
能的程式：從產生編號 1 的程式開始， ...
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