[SOLVED] Math On Large Base 10 & 16 Unsigned Numbers

[websmoken]

Howdy guys,

 

I'm trying to add the uniqid() base 16, to a large (15 - 18 bit) base 10 number, store both, later retrieving both numbers and subtracting.  Is this possible to do without the results going into scientific notation?

 

Websmoken

 

[kenrbnsn]

Please post the code you're using between

[/nocode] tags.

 

Ken

[websmoken]

Ken

Without posting the 3rd party script, heres what I got.  Orig_Num & HexNum is from the script.  I added the other code.

 

<?php
$HexNum = "0";
$NewNum = "0";
$Orig_Num = "1234567890123456";//any 15-18 bit base 10 number (always positive) from script.
$HexNum = uniqid("");// This $HexNum is from script as well (pulled from database).
$MidDec = base_convert($HexNum,16,10);
$NewNum = $NewNum + ($NewNum + $MidDec);//Store This number back in database.
?>

 

I do the reverse to obtain Original Number:

 

<?php

/* $NewNum retrieved from database then $Mid_Dec is subtracted from it, giving you the original number.  */
$Orig_Num = "0";
$Mid_Dec = "0";
$Mid_Dec = base_convert($HexNum,16,10);//$HexNum retrieved from database.
$Orig_Num = $NewNum - $Mid_Dec;
?>

 

Hope this helps.  What I have works its just in scientific notation before it goes in database and after its retrived.

 

Websmoken (Dave)

[kenrbnsn]

After much experimenting, here's what I've come up with...

<?php
$HexNum = "0";
$NewNum = "0";
$Orig_Num = "1234567890123456";//any 15-18 bit base 10 number (always positive) from script.
$HexNum = uniqid("");// This $HexNum is from script as well (pulled from database).
$MidDec = base_convert($HexNum,16,10);
$NewNum = $NewNum + ($NewNum + $MidDec);
//
// the next lines are my solution
//
ob_start();
var_dump($NewNum);
$x = ob_get_clean();
$NewNum = str_replace('float(','',str_replace(')','',$x)); //Store This number back in database.
?>

Do something similar in the other code snippet.

 

Ken

[websmoken]

Ken

 

I tried the code sniplet you provided,  a huge THANKS by the way for your help.  I then input the number "4444444444444444", in the database was the number "5675336579130000".  The output that appeared when I tried to retrieve the number was "4444444444440000".  Something with the first sniplet on the input side must somehow be rounding off the 1st 4 LSB's.  The hexnum was 45f7d6871e84b.

The 3rd party program is for PHP version 4.3.11 & MySQL version 4.0.  I'm running PHP5 & MySQL4 on localhost.  Don't know it this helps or not.

 

Thanks again,

        Dave