Re^4: Infinity and Inf? (MAX

The MAX_INT is somewhere between 2**49 and 2**50!

Your test is flawed. The maximum integer that can be accurately stored in a NV is 2**53 = 9007199254740992.

printf "%.15f\n", 2**53;;
9007199254740992.000000000000000
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Comment on Re^4: Infinity and Inf? (MAX_INT) Download Code

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Re^5: Infinity and Inf? (MAX_INT) by LanX (Saint) on Sep 01, 2010 at 13:27 UTC
> Your test is flawed. see my updates in the meantime! Cheers Rolf	[reply]
Re^6: Infinity and Inf? (MAX_INT) by tye (Sage) on Sep 01, 2010 at 13:53 UTC
Your test is still flawed because MAX_INT is not MAX_UINT nor is it "the maximum of the range of integers that can be exactly stored in an NV". ~0 is MAX_UINT. MAX_INT is int(~0/2), which is 32 bits on some builds of Perl but not on others. See "IV". `for( my $i= $start; 1; $i++ )` [download] Update: And it is usually spelt INT_MAX, it seems. - tye	[reply] [d/l]
Re^7: Infinity and Inf? (MAX_INT) by LanX (Saint) on Sep 01, 2010 at 14:29 UTC
> Your test is still flawed. see my updates in the meantime! Nota Bene: There are no restrictions of the range operator documented in perlop. > See "IV". Actually I'm expecting to work in a high level language which abstracts the implementation details away. Sure I could analyze the C-sources but thats not why I use Perl. `> grep -l " IV " /usr/share/perl/5.10/pod/.pod /usr/share/perl/5.10/pod/perlapi.pod /usr/share/perl/5.10/pod/perlguts.pod /usr/share/perl/5.10/pod/perlhack.pod /usr/share/perl/5.10/pod/perliol.pod /usr/share/perl/5.10/pod/perlreapi.pod /usr/share/perl/5.10/pod/perlxs.pod` [download] Cheers Rolf UPDATE: For those interested perlnumber holds some infos... especially: `In fact numbers stored in the native integer format may be stor +ed either in the signed native form, or in the unsigned native for +m. Thus the limits for Perl numbers stored as native integers would typ +ically be -231..2*32-1, with appropriate modifications in the case +of 64-bit integers. Again, this does not mean that Perl can do op +erations only over integers in this range: it is possible to store many +more integers in floating point format.` [download]	[reply] [d/l] [select]