为什么这个 "deaf grandma" 程序不正确？

Question

此代码将 return 根据整个字符串是否大写 return 正确的短语

response = ''

while response != "BYE"
    puts "What would you like deary?"
    response = gets.chomp
    if response = response.downcase
        puts "speak up!"
    else
        puts "I can hear you!"
    end
    response = gets.chomp
end

然而，无论输入的字符串是全部小写还是全部大写，此代码总是 returns "speak up":

puts "What would you like deary?"
response = gets.chomp

while response != "BYE"
    if response = response.downcase
        puts "speak up!"
    else
        puts "I can hear you!"
    end
    response = gets.chomp
end

我有点困惑为什么会这样。

Answer 1

您似乎想要测试相等性 (==)，而不是执行赋值 (=):

if response == response.downcase

为什么这个 "deaf grandma" 程序不正确？

Why is this "deaf grandma" program incorrect?

ruby