Re^2: log() and int() problem

in reply to Re: log() and int() problem
in thread log() and int() problem

And internally floats are stored in the string-slot of a variable

No they're not. An xpvnv has separate slots for an int, a float and a string:

[davem@pigeon bleed]$ p -MDevel::Peek -e'$x=1; $x=2.2; $x = "three"; D
+ump $x'
SV = PVNV(0x1ae3150) at 0x1b021d0
  REFCNT = 1
  FLAGS = (POK,pPOK)
  IV = 1
  NV = 2.2
  PV = 0x1afb360 "three"\0
  CUR = 5
  LEN = 16
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Dave.

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Re^3: log() and int() problem by LanX (Saint) on Dec 25, 2012 at 18:49 UTC
OK, thanks for correcting! (I already suspected that I should place one more "IIRC". :) Maybe I remembered something different or Scalar::Util::dualvar confused me or the reality in perl is even more complex. (and the latter wouldn't surprise me) Cheers Rolf PS: or was it JS ... ?!? UPDATE: For the records, here the source of my misunderstanding from perlnumber: Perl can internally represent numbers in 3 different ways: as native integers, as native floating point numbers, and as decimal strings. Decimal strings may have an exponential notation part, as in "12.34e-56" . Native here means "a format supported by the C compiler which was used to build perl". emphasis added.	[reply]

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Re^3: log() and int() problem
by LanX (Saint) on Dec 25, 2012 at 18:49 UTC

(I already suspected that I should place one more "IIRC". :)

Maybe I remembered something different or Scalar::Util::dualvar confused me or the reality in perl is even more complex. (and the latter wouldn't surprise me)

Cheers Rolf

PS: or was it JS ... ?!?

UPDATE:

For the records, here the source of my misunderstanding

from perlnumber:

Perl can internally represent numbers in 3 different ways: as native integers, as native floating point numbers, and as decimal strings. Decimal strings may have an exponential notation part, as in "12.34e-56" . Native here means "a format supported by the C compiler which was used to build perl".

emphasis added.

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