Re^4: unpacking unsigned long longs


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Re^4: unpacking unsigned long longs

by questionnaire (Novice)

on Jul 07, 2009 at 17:29 UTC ( [id://777952]=note: print w/replies, xml )

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in reply to Re^3: unpacking unsigned long longs
in thread unpacking unsigned long longs

Alright, so I tried unpacking Q (and q) to no avail. But perl didn't spit out any errors when I try to assign 2^45 to a variable and then print it. Does that still mean perl isn't compiled to support 64 bit numbers? If so, how can I go about fixing this?

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Re^5: unpacking unsigned long longs
by ikegami (Patriarch) on Jul 07, 2009 at 17:44 UTC

Did you really mean 2^45 (47) or 2**45 (35184372088832).

A double-precision floating point number can handle numbers much bigger than 2**45. And with 53 bits of precision, it can represent 2**45 faithfully.

If so, how can I go about fixing this?

See the "64 bit support" section in the perl distribution's INSTALL file for how to build such a perl.

Or like I said already, tell me which cell of my table you want, and I'll provide some code to do the same thing on a 32-bit build of Perl.

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