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Code Snippets / [DBC/DBP] Round Up Variables

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dark coder
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Joined: 6th Oct 2002
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Posted: 28th Nov 2007 22:06
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Quote: "If 5 and 10 can be represented with floats, .5 and .1 can as well. The number itself is irrelevant in this situation since the decimal can be anywhere."


No, .1 cannot be represented exactly. Floats store their numbers as fractions with an exponent so the decimal point doesn't move anywhere, the fraction result is merely multiplied. You can read about it here: http://en.wikipedia.org/wiki/IEEE_754

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Libervurto
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Joined: 30th Jun 2006
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Posted: 28th Nov 2007 22:49 Edited at: 28th Nov 2007 22:51
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It can be represented exactly, the exponent moves the digits around the point so 1 can be displayed just as well as .1

@Latch
Thanks, I assumed the computer did the same thing anyway

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dark coder
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Posted: 28th Nov 2007 23:06
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This doesn't look exactly like 0.1 to me. That said, 0.1 should be just 1/10, however some more complex numbers will get inaccurate.

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Libervurto
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Posted: 28th Nov 2007 23:17
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hmm, I have noticed with some programs that adding/subtracting 0.1 around 0.0 has some funny results.

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