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Re: Integer overflow in Perl and C

by rob_au (Abbot)
on Jan 24, 2004 at 12:21 UTC ( #323822=note: print w/ replies, xml ) Need Help??


in reply to Integer overflow in Perl and C

3. Are there any other (neater) implementations of my script above

In terms of the original problem as presented, I believe that it an alternate approach employing the exponentiation operator/functions would be more efficient and side-step the format conversion problems.

In Perl:

perl -le 'print $_, ": 0 to ", 2**$_ - 1 for 0..32'
In C:
#include <stdio.h> #include <math.h> int main (void) { int i; for (i = 0; i <= 32; i++) printf("%d: 0 to %.f\n", i, pow(2, i) - 1); return(0); }
Both implementations are capable of outputting ranges of unsigned integer numbers for up to 64 bits (untested beyond).

 

perl -le "print unpack'N', pack'B32', '00000000000000000000001010110011'"


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