Re^2: hexadecimal division (hexadecimal floating point -updated)

> hexadecimal is just another representation format for the more abstract concept of an integer

minor nitpick, to my surprise it's now possible to define hexadecimal floats.

0x1.999ap-4 # hexadecimal floating point (the "p" is required)

couldn't test yet, seems to be newer than 5.16 :)

yep

  DB<1> p $]
5.024001
  DB<2> p 0x1.999Ap-4
0.100000381469727
[download]

Though not mentioned in perlnumber yet

seems to work, the exponent 4 counts to the power of 2 (NOT 16 or 256). (16**4 is there to move the fraction point)

  DB<37> p 0x1999A /16**4 /2**4
0.100000381469727
[download]

And it becomes obvious why p was used since an E is a valid hex digit.

  DB<49> eval qq{print 0x1p${_},"\n"} for -4..4
0.0625
0.125
0.25
0.5
1
2
4
8
16
[download]

Hex fraction point moves with each 4 power steps (since 16 == 2**4 )

  DB<58> x 0x10 ,  0x1.0p4 , 0x1.0p0 , 0x10p-4
0  16
1  16
2  1
3  1
[download]

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Wikisyntax for the Monastery}

Comment on Re^2: hexadecimal division (hexadecimal floating point -updated) Select or Download Code

Replies are listed 'Best First'.
Re^3: hexadecimal division (hexadecimal floating point -updated) by haukex (Archbishop) on Dec 16, 2017 at 21:24 UTC
hexadecimal floats Yep, that's why I said "I'll just talk about integers for now" - but I could have worded it better, thank you for pointing that out! I've updated the node.	[reply]
Re^4: hexadecimal division (hexadecimal floating point) by LanX (Saint) on Dec 16, 2017 at 21:35 UTC
No critic at all - that's a stunning new feature I really love. :) It's rather the fact it's not mentioned in `perlnumber` that drove me to this post. Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Wikisyntax for the Monastery}	[reply]
Re^3: hexadecimal division by choroba (Cardinal) on Dec 16, 2017 at 21:07 UTC
Yes, 5.22. ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l]