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Ruby: String Comparison Issues (5 answers)

Closed 3 years ago.

我正在使用以下代码比较插图,但总是将我带至<条码>。为什么?

print("Enter your state abbreviation: ")
state_abbreviation = gets
if state_abbreviation.upcase == "NC"
  puts("North Carolina")
elsif state_abbreviation.upcase == "SC"
  puts("Sourth Carolina")
elsif state_abbreviation.upcase == "GA"
  puts("Georgia")
elsif state_abbreviation.upcase == "FL"
  puts("Florida")
elsif state_abbreviation.upcase == "AL"
  puts("Alabama")
else
  puts("You have enter wrong abbreviation")
end

我还尝试了<代码>.eql? (“string”),但我得出同样的结果。

Answer 1

靠车返回的扼杀行动最终将发生突破。使用<代码>String#chomp去除(即:state_abbreviation=ccs.chomp)。

PS:如果你使用案件时间,而不是如果使用的话,那么你的代码会更清洁。

Answer 2

我没有足够的意见,但我认为,克里斯·杰斯特-Young的教义是真的 ne。

statehash = { "RI" => "Rhode Island", "NC" => "North Carolina" }

print "Enter your state abbreviation: "
state_abbreviation = gets.chomp.upcase

puts statehash[state_abbreviation]

这部法典比一个小小小小小小小小小小小小小小小小小小小小小小。它还允许 has国家物体,关键是缩略语,其价值为物体。

Answer 3

在主角之前,他说:

state_abbreviation.chomp!

作为使用<代码>case<>/code>的优异建议的一种替代方法,考虑将斜体与国家简称作为关键。

Answer 4

<代码>gets 回归你用新线分类的。 Try state_abbreviation =accesss.chomp

Answer 5

You are using gets, and probably your shell/input is adding a newline ( ) character at the end of the string, and maybe you may want to use the case statement:

例如:

print("Enter your state abbreviation: ") 
state_abbreviation = gets.strip

case state_abbreviation
  when "NC" then puts("North Carolina")
  when "SC" then puts("South Carolina")
  # ...
  else puts("You have enter wrong abbreviation")
end

Answer 6

虽然我们回避了专题,并对办法与问题进行了评论,但排除了这种铁路。他从一个网站上抽出所有的国家缩略语。我 m着这种狂热,因为它完全从你的法典中抽取了地图(不过,这或许是挽救网站的良好想法,就是如此)。之后,你可以把这同一道,防止实际上袭击非行。

http://railscasts.com/episodes/179-seed-data

http://railscasts.com/episodes/115-caching-in-rails-2-1”rel=“nofollow” http://railscasts.com/episodes/115-caching-in-rails-2-1

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