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                # break,return 關鍵字 #### break break用來終止while,repeat,for三種循環的執行,并跳出當前循環體,繼續執行當前循環之后的語句。下面舉一個while循環中的break的例子來說明: ~~~ --計算最小的x,使從1到x的所有數相加和大于100 sum = 0 i = 1 while true do sum = sum + i i = i + 1; if sum > 100 then break end end print("The result is "..i) ~~~ > 運行結果如下:The result is 15 在實際應用中,break經常用于嵌套循環中。 #### return return主要用于從函數中返回一個或多個值,相關的細節可以參考[函數的返回值](#)章節。return只能寫在最后的語句塊,一旦執行了return語句,該語句之后的所有語句都不會再執行。若要寫在函數中間,則只能寫在一個顯式的語句塊內,參見示例代碼: ~~~ function add(x, y) return x + y --print("add: I will return the result "..(x+y)) --因為前面有個return,若不注釋該語句,則會報錯 end function is_positive(x) if x > 0 then return x.." is positive" else return x.." is non-positive" end print("function end!")--由于return只出現在前面顯式的語句塊,所以此語句不注釋也不會報錯,但是不會被執行,此處不會產生輸出 end sum = add(10, 20) print("The sum is "..sum) answer = is_positive(-10); print(answer) ~~~ > 運行結果如下: > > The sum is 30 > > -10 is non-positive
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