问题描述
这是我的代码:
print "What's your first name"
first_name = "p".gets.chomp.capitalize!
puts "#{first_name}"
puts "Your name is #{first_name}!"
print "What's your last name?"
last_name = "m".gets.chomp.capitalize!
puts "#{last_name}"
puts "Your name is #{last_name}!"
print "What city do you live in?"
city = "world".gets.chomp.capitalize!
puts "#{city}"
puts "You live in #{city}!"
print "What state do you live in?"
state = "OR".gets.chomp.upcase!
puts "#{state}"
puts "You live in the state of #{state}!"
我一直收到这个错误:
private method `gets' called for "p":String
我做错了什么?
推荐答案
有一个 Kernel 中的gets 方法和Object 包括Kernel.这意味着几乎所有东西都包含 Kernel，所以几乎所有东西都有 gets 方法.Kernel 中的许多(私有)方法的目的是允许您将某些方法(例如 gets)视为普通函数，以便您可以这样说:
There is a gets method in Kernel and Object includes Kernel. That means that almost everything includes Kernel so almost everything has a gets method. The intent of a lot of the (private) methods in Kernel is to allow you to treat some methods (such as gets) as plain functions so you can say things like:
s = gets
从标准输入读取.
当你这样做时:
"parker".gets.chomp.capitalize!
您在 String 上从 Kernel 调用私有 gets，但是使用显式接收器调用私有方法是 NoMethodError.
You're calling the private gets from Kernel on a String but calling private methods with an explicit receiver is a NoMethodError.
如果您想从标准输入中读取名字，那么您只需要:
If you want to read the first name from the standard input then you just want this:
first_name = gets.chomp.capitalize
对于其他 gets 调用也类似.
Similarly for the other gets calls.
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