Clever. For those of us unfamiliar with bitwise ops, here's how this works:
The bitwise and op () works on bits like this:
dig1 dig2 Result
000
010
100
111
An even number's binary representation always ends with 0 (ie 12 = 1100)
while an odd ends with 1 (ie 13 = 1101).
So doing a bitwise with 1 will only produce 1 if the last binary digit is
1 (ie an odd num), otherwise 0 (see table).
And, like Nathan implies, this will be very fast (way faster than modulus),
since you only ever deal with 2 bits of info.
For an explanation of other bitwise operators, look here:
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/bitwise.html
J
on 3/5/01 12:36 PM, Nathan Cassano at [EMAIL PROTECTED] wrote:
You all are a bunch of un-optimizing novices. Just do some bit banging.
i.e.
if(1 number){
echo "$number is odd";
}else{
echo "$number is even";
}
-Original Message-
From: Brandon Orther [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 05, 2001 12:18 PM
To: PHP User Group
Subject: [PHP] Is it odd or even???
Hello,
Is there an easy way to check and see if a number is odd or even?
Thank you,
Brandon Orther
WebIntellects Design/Development Manager
[EMAIL PROTECTED]
800-994-6364
www.webintellects.com
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