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Major Member
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文章: 283
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因為浮點數無法精確地儲存某些數值。
http://en.wikipedia.org/wiki/Floating-point_number
引用:
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Floating-point numbers are intended to approximate the mathematical real numbers. But while the real numbers form a continuum that can be subdivided without limit, floating-point numbers have only finite resolution—they can only represent discrete points on the real number line. (In double precision representation, consecutive points differ by about 1 part in 1016.) That is, they can only represent a subset of the reals.
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