Question

我在使用以下代码时遇到了一些问题：

puts "Press a key"
key = STDIN.getc
puts key.class
puts "You have pressed #{key}"
puts key.class
while key != "f" do
    case key
    when "g"
      puts "It's 'g'"
    when "h"
      puts "It's 'h'"
    when "j"
      puts "It's 'j'"
    else
      puts "You gave me #{key} -- I have no idea what to do with that."
    end
    puts "Press a key"
    key = STDIN.getc
    puts "You have pressed #{key}"
end

如果您输入＆＃39; f＆＃39;，它可以正常工作，但如果您输入＆＃39; g＆＃39;例如，有两个问题：

＆＃34;＆＃34;运行所有案例，不仅适用于＆＃39;炭
WHILE循环中的STDIN.getc似乎被执行了2次，即使我只键入一次char。

错误在哪里？

Answer 1

不完全确切，但似乎STDIN.getc不会阻止循环你可以试试这样的东西

puts "Press a key"
while key = gets.chomp
  break if key == "f"
  puts key.class
  puts "You have pressed #{key}"
  puts key.class

  case key
  when "g"
    puts "It's 'g'"
  when "h"
    puts "It's 'h'"
  when "j"
    puts "It's 'j'"
  else
    puts "You gave me #{key} -- I have no idea what to do with that."
  end

  puts "Press a key"
end

红宝石铅。用＆＃34; STDIN.getc＆＃34;和＆＃34;＆＃34;循环

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