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                ![](http://www.rhinostudio.cn/files/course/2019/01-04/1022499b9952740896.jpg) ## **Number 雙精度浮點數** 是計算機使用的一種數據類型,使用 64 位(8字節) 來存儲一個浮點數。 它可以表示十進制的15或16位有效數字,其可以表示的數字的絕對值范圍大約是:2.23x10\-308?~ 1.79x10308 對于我們····就是小數啦。
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