[PHP] Repeating Decimals
Hello again, This is another PHP mathematical question. How can I display a bar over a number (overline) if it's a repeating decimal? When the user types in 1 by 3, they get 0.. I want it to display as 0.3 with the 3 overlined. How can I do this keeping in mind that not all numbers will be repeating decimals? Thanks, Stephen Craton http://www.melchior.us "What is a dreamer that cannot persevere?" -- http://www.melchior.us -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Repeating Decimals
> This is another PHP mathematical question. How can I display a bar over a > number (overline) if it's a repeating decimal? When the user types in 1 by > 3, they get 0.. I want it to display as 0.3 with the 3 > overlined. How can I do this keeping in mind that not all numbers will be > repeating decimals? Well, the first problem is finding a charset or something that has a number with a line over it and how you'd create that character in HTML, unless you want to use an image or something. Next, you can treat the result as a string and look at the last X digits. If they are the same, remove them all and substitute with the number and a bar. It just comes down to string manipulation... ---John Holmes... -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Repeating Decimals
0.3 Stephen wrote: Hello again, This is another PHP mathematical question. How can I display a bar over a number (overline) if it's a repeating decimal? When the user types in 1 by 3, they get 0.. I want it to display as 0.3 with the 3 overlined. How can I do this keeping in mind that not all numbers will be repeating decimals? Thanks, Stephen Craton http://www.melchior.us "What is a dreamer that cannot persevere?" -- http://www.melchior.us -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Repeating Decimals
Hi,
Friday, December 6, 2002, 5:00:07 AM, you wrote:
S> Hello again,
S> This is another PHP mathematical question. How can I display a bar over a
S> number (overline) if it's a repeating decimal? When the user types in 1 by
S> 3, they get 0.. I want it to display as 0.3 with the 3
S> overlined. How can I do this keeping in mind that not all numbers will be
S> repeating decimals?
Did this as an exercise :)
function check_to_end($str,$pat){
$lp = strlen($pat);
$ls = strlen($str);
$x = 0;
while(true){
$ls = strlen($str);
if($ls > $lp){//string bigger than pattern
$t = substr($str,0,$lp);
if($t != $pat){
return false;
}
$str = substr($str,$lp);
}else{//pattern too big .. checks tail end
$pat = substr($pat,0,strlen($str));
if( $pat != $str) return false; //no repeat
if($x < 2) return false; //didn't repeat enough
return true; //found a pattern
}
$x++;
}
}
function repeat($num){
$s = substr(number_format($num,16),0,-1); //make a string
echo $s;
list($a,$b) = split('\.',$s); //split decimal bit out
$l = strlen($b);
for($i=0;$i<$l;$i++){ //loop through string
$o = 0;
$k = $b[$i];//number to find
for($y = $i+1;$y<$l;$y++){ //loop look for same number
$c = ord($b[$y]);
if(ord($k) == ord($b[$y])){ //got a match
$pat = substr($b,$i,$y-$i); //cut out pattern
$str = substr($b,$i); //string to check
if(check_to_end($str,$pat)){ //see if pattern runs
till the end
$o = 1; //yep
if(ord($pat) == ord('0')) $o = 2; //were they
just '0's
break;
}
}
}
if($o)break; // all done
}
if($o == 1){ // a pattern
$r = $a.'.'.substr($b,0,$i).''.$pat.'';
}elseif($o == 2){ // whole bunch of ending 0s
$r = (substr($b,0,$i) != '')? $a.'.'.substr($b,0,$i):$a;
}else{ //no repeat
$r = $s;
}
return $r;
}
//usage
for($x = 1;$x < 100;$x++){
$a = 11/$x;
$res = repeat($a);
echo ' returned: '.$res.'';
}
The check_to_end() function could probably be replaced with a regex but those
go in the same basket as vi with my old brain :)
Regards Tom
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Repeating Decimals
How would I run the functions though and then print the repeating decimal to
the screen?
- Original Message -
From: "Tom Rogers" <[EMAIL PROTECTED]>
To: "Stephen" <[EMAIL PROTECTED]>
Cc: "PHP List" <[EMAIL PROTECTED]>
Sent: Friday, December 06, 2002 8:38 AM
Subject: Re: [PHP] Repeating Decimals
> Hi,
>
> Friday, December 6, 2002, 5:00:07 AM, you wrote:
> S> Hello again,
>
> S> This is another PHP mathematical question. How can I display a bar over
a
> S> number (overline) if it's a repeating decimal? When the user types in 1
by
> S> 3, they get 0.. I want it to display as 0.3 with the 3
> S> overlined. How can I do this keeping in mind that not all numbers will
be
> S> repeating decimals?
>
> Did this as an exercise :)
>
> function check_to_end($str,$pat){
> $lp = strlen($pat);
> $ls = strlen($str);
> $x = 0;
> while(true){
> $ls = strlen($str);
> if($ls > $lp){//string bigger than pattern
> $t = substr($str,0,$lp);
> if($t != $pat){
> return false;
> }
> $str = substr($str,$lp);
> }else{//pattern too big .. checks tail end
> $pat = substr($pat,0,strlen($str));
> if( $pat != $str) return false; //no repeat
> if($x < 2) return false; //didn't repeat enough
> return true; //found a pattern
> }
> $x++;
> }
> }
> function repeat($num){
> $s = substr(number_format($num,16),0,-1); //make a string
> echo $s;
> list($a,$b) = split('\.',$s); //split decimal bit out
> $l = strlen($b);
> for($i=0;$i<$l;$i++){ //loop through string
> $o = 0;
> $k = $b[$i];//number to find
> for($y = $i+1;$y<$l;$y++){ //loop look for same number
> $c = ord($b[$y]);
> if(ord($k) == ord($b[$y])){ //got a match
> $pat = substr($b,$i,$y-$i); //cut out
pattern
> $str = substr($b,$i); //string to check
> if(check_to_end($str,$pat)){ //see if
pattern runs till the end
> $o = 1; //yep
> if(ord($pat) == ord('0')) $o = 2;
//were they just '0's
> break;
> }
> }
> }
> if($o)break; // all done
> }
> if($o == 1){ // a pattern
> $r = $a.'.'.substr($b,0,$i).''.$pat.'';
> }elseif($o == 2){ // whole bunch of ending 0s
> $r = (substr($b,0,$i) != '')? $a.'.'.substr($b,0,$i):$a;
> }else{ //no repeat
> $r = $s;
> }
> return $r;
> }
> //usage
> for($x = 1;$x < 100;$x++){
> $a = 11/$x;
> $res = repeat($a);
> echo ' returned: '.$res.'';
> }
>
> The check_to_end() function could probably be replaced with a regex but
those
> go in the same basket as vi with my old brain :)
>
> Regards Tom
>
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re[2]: [PHP] Repeating Decimals
Hi, Saturday, December 7, 2002, 6:36:18 AM, you wrote: S> How would I run the functions though and then print the repeating decimal to S> the screen? The function returns the string ready to print You will need to comment out the echo $s line, it was there for debugging. just do where ever you need it -- regards, Tom -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re[4]: [PHP] Repeating Decimals
Hi, Sunday, December 8, 2002, 1:46:07 AM, you wrote: S> Ok, I'm getting some weird errors. Here's the website: S> http://check.melchior.us/module.php?id=3 S> I attached the output file. What am I doing wrong!? S> - Original Message - S> From: "Tom Rogers" <[EMAIL PROTECTED]> S> To: "Stephen" <[EMAIL PROTECTED]> S> Cc: "PHP List" <[EMAIL PROTECTED]> S> Sent: Friday, December 06, 2002 11:26 PM S> Subject: Re[2]: [PHP] Repeating Decimals >> Hi, >> >> Saturday, December 7, 2002, 6:36:18 AM, you wrote: >> S> How would I run the functions though and then print the repeating S> decimal to >> S> the screen? >> >> The function returns the string ready to print >> You will need to comment out the echo $s line, it was there for debugging. >> >> just do where ever you need it >> >> >> >> -- >> regards, >> Tom >> >> >> -- >> PHP General Mailing List (http://www.php.net/) >> To unsubscribe, visit: http://www.php.net/unsub.php >> >> You chopped off this line at the very begining of the function $s = substr(number_format($num,16),0,-1); //make a string -- regards, Tom -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: Re[2]: [PHP] Repeating Decimals
Ok, I'm getting some weird errors. Here's the website: http://check.melchior.us/module.php?id=3 I attached the output file. What am I doing wrong!? - Original Message - From: "Tom Rogers" <[EMAIL PROTECTED]> To: "Stephen" <[EMAIL PROTECTED]> Cc: "PHP List" <[EMAIL PROTECTED]> Sent: Friday, December 06, 2002 11:26 PM Subject: Re[2]: [PHP] Repeating Decimals > Hi, > > Saturday, December 7, 2002, 6:36:18 AM, you wrote: > S> How would I run the functions though and then print the repeating decimal to > S> the screen? > > The function returns the string ready to print > You will need to comment out the echo $s line, it was there for debugging. > > just do where ever you need it > > > > -- > regards, > Tom > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: Re[8]: [PHP] Repeating Decimals
That's ok. The user needs to use some of his/her brain too. :P Thanks again! - Original Message - From: "Tom Rogers" <[EMAIL PROTECTED]> To: "Stephen" <[EMAIL PROTECTED]> Sent: Saturday, December 07, 2002 2:03 PM Subject: Re[8]: [PHP] Repeating Decimals > Hi, > > Sunday, December 8, 2002, 4:51:37 AM, you wrote: > S> Thanks! I works now. > > > S> - Original Message - > S> From: "Tom Rogers" <[EMAIL PROTECTED]> > S> To: "Stephen" <[EMAIL PROTECTED]> > S> Sent: Saturday, December 07, 2002 1:46 PM > S> Subject: Re[6]: [PHP] Repeating Decimals > > Good :) > One problem is rounding which screws things up as it can round up the last > digit giving a false answer. 1/13 for example which gives 0.0769230769231 <<< 07 > rounded up to 1 > Not sure what to do about that... > > -- > regards, > Tom > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
