Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

Re: A philosophical pondering concerning hexes

by Abigail-II (Bishop)
on Jun 23, 2004 at 10:47 UTC ( #368999=note: print w/ replies, xml ) Need Help??


in reply to A philosophical pondering concerning hexes

Your dec has a problem. Anything matched by /^[0-7]+$/ or /^\d+$/ is going to be matched by /^(0x)?[0-9A-Fa-f]+$/i as well, so if you do the tests in order you present it, it'll assume either hexadecimal, or binary. Reversing the order will give a problem as well. How would you distinguish between 1016 == 1610, 1010, and 108 == 810 (subscripts indicate base)?

Of course, as pointed out, your fallacy lies in assuming that oct and hex return decimal representations of numbers - they don't. They return numbers:

$ perl -MDevel::Peek -wle 'Dump hex 10' SV = IV(0x8192014) at 0x8181270 REFCNT = 1 FLAGS = (IOK,READONLY,pIOK) IV = 16
It's a number - without a stringified valued.

Also, Perl already has a function to turn a number into a hexadecimal, octal or binary representation: it's called sprintf.

Abigail


Comment on Re: A philosophical pondering concerning hexes
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://368999]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (9)
As of 2014-10-02 12:55 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    What is your favourite meta-syntactic variable name?














    Results (56 votes), past polls