ルアでテーブルのインデックスをランダムに取得するにはどうすればよいですか？

Question

ランダム質問をqusから得るには、4つの質問のテーブルですか？

-- qus = table of questions 
for i = 1 , 4 do 
    qus = {} 
    qus[i] = "what is your name?" 
    qus[i] = "how old are you?" 
    qus[i] = "where are you living?" 
    qus[i] = "what are you doing?" 

    local label = display.newText(qus[i],160,100) 
end 
print(qus[i]) 

-- Prints: 
-- what are you doing 
-- what are you doing 
-- what are you doing 
-- what are you doing 

私はこれを試してみました：

qus[1] = "what is your name?" 
qus[2] = "how old are you?" 
qus[3] = "where are you living?" 
qus[4] = "what are you doing?" 

label = all qus shows 

を助けることができる誰もいただきありがとうございます。

Answer 1

使用math.random（）関数：

local qus = {} 

qus[1] = "what is your name?" 
qus[2] = "how old are you?" 
qus[3] = "where are you living?" 
qus[4] = "what are you doing?" 

math.randomseed(os.time()) -- init generator 

local index = math.random(#qus) -- between 1 and 4 (size of table) 
print(qus[index])