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                            # while 型控制結構

Lua跟其他常見語言一樣，提供了while控制結構，語法上也沒有什么特別的。但是沒有提供do-while型的控制結構,但是提供了功能相當的[repeat](#)。

while型控制結構語法如下，當表達式值為假（即false或nil）時結束循環。也可以使用[break](#)語言提前跳出循環。

~~~
while 表達式 do
--body
end
~~~
> 示例代碼，求 1 + 2 + 3 + 4 + 5的結果

~~~
x = 1
sum = 0

while x <= 5 do
    sum = sum + x
    x = x + 1
end
print(sum)  -->output 15
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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