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I would like to read in 64 bit hexadecimal numbers and do math with them using Perl.
I tried the following, but it doesn’t seem to work.
> perl -e 'use integer; printf("%x\n", hex("0xffffffffffff")<<2)'
Integer overflow in hexadecimal number at -e line 1.
fffffffc
Works fine on my 64-bit system.
Try
use bignuminstead ofuse integer.