RUBY：If/Else语句创建循环

Question

我正在寻找正确的方式在Ruby中执行此操作。我想创建一个if/else语句，它将保持循环，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语句循环，如果猜数，再破，就像这样：

while true 
    puts "Guess a number:" 
    if gets.chomp.to_i == 5 
    puts "correct" 
    break 
    end 
    puts "guessed wrong, please try again!" 
end 

或使用until声明：

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

puts "correct" 

为@izaban说，loop...do也可以工作：

loop do 
    puts "Guess a number:" 
    if gets.chomp.to_i == 5 
    puts "correct" 
    break 
    end 
    puts "guessed wrong, please try again!" 
end 

Answer 2

这是一个没有用break了解决方案：

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'