RE: [PHP] Is it odd or even???
> Is there an easy way to check and see if a number is odd or even?
if( $num % 2 ) {
echo "Odd";
} else {
echo "Even";
}
Chris
Re: [PHP] Is it odd or even???
You could divide it by 2, odd numbers will always have a remainder even umbers never will. here are math functions, but none for odd/even that i see. Jon - Original Message - From: "Brandon Orther" <[EMAIL PROTECTED]> To: "PHP User Group" <[EMAIL PROTECTED]> Sent: Monday, March 05, 2001 3:17 PM Subject: [PHP] Is it odd or even??? > Hello, > > Is there an easy way to check and see if a number is odd or even? > > Thank you, > > > Brandon Orther > WebIntellects Design/Development Manager > [EMAIL PROTECTED] > 800-994-6364 > www.webintellects.com > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] Is it odd or even???
use the modulus operator: ($number % 2) returns 0 if the value is even Larry Jeannette MIS Director, e.Republic -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 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] Is it odd or even???
> That won't work. % returns the remainder from a division of
> the number divided by the mod number.
Yours:
> if($num %2 == 0){
> echo "even";
> }else{
> echo "odd";
> }
Mine:
> > if( $num % 2 ) {
> > echo "Odd";
> >
> > } else {
> > echo "Even";
> >
> > }
Ours are identical, just the other way around. This:
if( $num % 2 ) {
means if the result of that operation is anything other than
0 (zero), which is a truth in PHP.
Chris
RE: [PHP] Is it odd or even???
Use the modulus operator > -Original Message- > From: Brandon Orther [mailto:[EMAIL PROTECTED]] > Sent: Monday, March 05, 2001 3:18 PM > To: PHP User Group > Subject: [PHP] Is it odd or even??? > > > Hello, > > Is there an easy way to check and see if a number is odd or even? > > Thank you, > > > Brandon Orther > WebIntellects Design/Development Manager > [EMAIL PROTECTED] > 800-994-6364 > www.webintellects.com > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > To contact the list administrators, e-mail: [EMAIL PROTECTED] > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] Is it odd or even???
Color me confused because I though true was any non zero value and false was
zero.
I know I am using the following code:
if (!($num % 4){ do something}
and it does something when $num is evenly divisible by 4 (ie. $num % 4 = 0).
If I were testing for odd vs even I'd do the following:
if (!($num % 2) {
Odd
} else {
Even
}
John Guynn
This email brought to you by RFCs 821 and 1225.
-Original Message-
From: Boget, Chris [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 05, 2001 2:33 PM
To: 'Kenneth R Zink II'; Php (E-mail)
Subject: RE: [PHP] Is it odd or even???
> That won't work. % returns the remainder from a division of
> the number divided by the mod number.
Yours:
> if($num %2 == 0){
> echo "even";
> }else{
> echo "odd";
> }
Mine:
> > if( $num % 2 ) {
> > echo "Odd";
> >
> > } else {
> > echo "Even";
> >
> > }
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RE: [PHP] Is it odd or even???
> Color me confused because I though true was any non zero
> value and false was zero.
Right. And
if( $num % 2 ) {
echo "it's odd";
}
means that the operation returned a remainder - a non zero value.
> I know I am using the following code:
> if (!($num % 4){ do something}
> and it does something when $num is evenly divisible by 4 (ie.
> $num % 4 = 0).
> If I were testing for odd vs even I'd do the following:
> if (!($num % 2) {
> Odd
And this is:
If( NOT ZERO ) {
Odd
}
which is the same as:
if( $num % 2 ) {
If there is a remainder, it's not zero.
Chris
RE: [PHP] Is it odd or even??? Optimize!!!
You all are a bunch of un-optimizing novices. Just do some bit banging.
i.e.
if(1 & number){
echo "$number is odd";
}else{
echo "$number is even";
}
-Original Message-
From: Brandon Orther [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 05, 2001 12:18 PM
To: PHP User Group
Subject: [PHP] Is it odd or even???
Hello,
Is there an easy way to check and see if a number is odd or even?
Thank you,
Brandon Orther
WebIntellects Design/Development Manager
[EMAIL PROTECTED]
800-994-6364
www.webintellects.com
--
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To unsubscribe, e-mail: [EMAIL PROTECTED]
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Re: [PHP] Is it odd or even??? Optimize!!!
Clever. For those of us unfamiliar with bitwise ops, here's how this works:
The bitwise and op (&) works on bits like this:
dig1 dig2 Result
000
010
100
111
An even number's binary representation always ends with 0 (ie 12 = 1100)
while an odd ends with 1 (ie 13 = 1101).
So doing a bitwise & with 1 will only produce 1 if the last binary digit is
1 (ie an odd num), otherwise 0 (see table).
And, like Nathan implies, this will be very fast (way faster than modulus),
since you only ever deal with 2 bits of info.
For an explanation of other bitwise operators, look here:
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/bitwise.html
J
on 3/5/01 12:36 PM, Nathan Cassano at [EMAIL PROTECTED] wrote:
>
> You all are a bunch of un-optimizing novices. Just do some bit banging.
>
> i.e.
>
> if(1 & number){
> echo "$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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