Re: Float/double to hex?

1 / 7 = 0.142857142857143 = 0x6FDF1234

That hex value doesn't correspond to either a float or double in IEEE format?

print unpack 'h*', pack 'f', 1/7;;
529421e3

print unpack 'h*', pack 'd', 1/7;;
2942942942942cf3
[download]

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Comment on Re: Float/double to hex? Download Code

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Re^2: Float/double to hex? by Anonymous Monk on Feb 18, 2013 at 01:35 UTC
Well, FWIW, https://www.wolframalpha.com/input/?i=1%20%2F%207%20%3D%200.142857142857143%20%3D%200x6FDF1234 seems to poop it out just fine I figure it is https://en.wikipedia.org/wiki/Single-precision_floating-point_format but I can't get it correct I can get https://en.wikipedia.org/wiki/Single-precision_floating-point_format#Single-precision_examples on my machine (3eaa aaab ≈ 1/3) with `$ perl -le " print unpack 'H*', pack 'f>', 1/3 3eaaaaab` [download] but basically I tired brute forced it :) I also saw these and they might have something to do with it, but the bits got me :) Network IEEE 754 to Native Floats: which pack/unpack ops better?, Extracting IEEE 754 floating point numbers	[reply] [d/l]
Re^3: Float/double to hex? by BrowserUk (Patriarch) on Feb 18, 2013 at 01:56 UTC
I've no idea what that hex value is, but it certainly isn't any IEEE representation of 1/7. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]
Re^3: Float/double to hex? by Anonymous Monk on Feb 18, 2013 at 01:37 UTC
HA! I completely got fooled by wolfraudalpha	[reply]
Re^3: Float/double to hex? by Mr. Muskrat (Canon) on Feb 18, 2013 at 18:21 UTC
https://www.wolframalpha.com/input/?i=convert+1%2F7+to+hex	[reply]


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