Question

我正在寻找在Ruby中执行此操作的正确方法。我想创建一个if / else语句，它将一直循环，直到找到正确的答案。例如：

puts "Guess a number",prompt
$stdin.gets.chomp = x
if x == 5
   puts "correct
else
    # loop back to beginning and start over
end

Answer 1

您可以使用while true puts "Guess a number:" if gets.chomp.to_i == 5 puts "correct" break end puts "guessed wrong, please try again!" end语句循环，如果猜测数字，那么就像这样打破：

until

或使用puts "Guess a number:" until gets.chomp.to_i == 5 do puts "guessed wrong, please try again!" end puts "correct"声明：

loop...do

正如@izaban所说，loop do puts "Guess a number:" if gets.chomp.to_i == 5 puts "correct" break end puts "guessed wrong, please try again!" end也可以起作用：

var data = {} // your json data

Answer 2

这是一个不使用break的解决方案：

guess = 0
first_run_through = true

until guess == 5
  puts 'guessed wrong, please try again!' unless first_run_through
  first_run_through = false
  puts 'Guess a number'
  guess = gets.chomp.to_i
end

puts 'correct'

RUBY：if / Else语句创建一个循环

2 个答案: