一個小紅寶石腳本的問題

Question

我剛開始學習ruby。 現在我試着去編寫一個小腳本，其播放montyhall問題 我有一個問題與代碼

numgames = 10000 # Number of games to play 
switch = true # Switch your guess? 
wins = 0 
numgames.times do doors = [0, 0, 0] # Three doors! 
doors[rand(3)] = 1 # One of them has a car! 
guess = doors.delete_at(rand(3)) # We pick one of them! 
doors.delete_at(doors[0] == 0 ? 0 : 1) # Take out one of the remaining doors that is not a car! 
wins += switch ? doors[0] : guess end 
puts "You decided #{switch ? "" : "not "}to switch, and your win % is #{wins.times()/numgames}" 

Answer 1

你wins是一個整數，所以你不需要.times或.size，你這樣做，不過，要.to_f強制東西放到浮點模式：

wins.to_f/numgames 

如果你想有一個百分比，那麼你「馬上有100乘：

wins.to_f/numgames * 100 

你也應該適當地縮進代碼的可讀性，打破上去換行，使其更容易閱讀和便於解析器要弄清楚：

numgames = 10000 # Number of games to play 
switch = true # Switch your guess? 
wins = 0 
numgames.times do 
    doors = [0, 0, 0] # Three doors! 
    doors[rand(3)] = 1 # One of them has a car! 
    guess = doors.delete_at(rand(3)) # We pick one of them! 
    doors.delete_at(doors[0] == 0 ? 0 : 1) # Take out one of the remaining doors that is not a car! 
    wins += switch ? doors[0] : guess 
end 
puts "You decided #{switch ? "" : "not "}to switch, and your win % is #{100 * wins.to_f/numgames}" 

Answer 2

在最後一行的最後一行替換

wins.times() 

與

wins 

times返回Enumerator，這與分區不匹配。

Answer 3

兩個問題：

首先，wins和numgames是整數，並且整數除法返回一個整數：

irb(main):001:0> 6632/10000 
=> 0 

因此，改變wins = 0到wins = 0.0。這將強制進行浮點除法，這將返回浮點回答。第二，wins是一個數字，而不是數組。所以擺脫wins.times()和wins.size()。兩者都是錯誤的。

有了這兩個變化，我始終得到約66％的勝利，這只是正好說明Marilyn vos Savant是方式比我聰明。