# Arduino Code整理(有看到新的可以補充) ### const宣告常數 例如:const float PI=3.14159 我們利用const定義常數,則該符號就會永遠保持定義的值,程式中任何位置都不會改變他的值。(define也是定義常數,但是arduino已經淘汰這種用法)
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