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 0.333333333333. 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,$i).'<span
style="text-decoration:overline">'.$pat.'</span>';
> }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.'<br>';
> }
>
> 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
