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numerical inconsistencies doing dec to hex conv.

Subject: numerical inconsistencies doing dec to hex conv.
From: Peter Doggett <ee99ppd@xxxxxxxxxxxx>
Date: Mon, 10 Mar 2003 12:05:02 +0000 (GMT)
hex conv

I am using the below template to convert a decimal number 
into a hex number. It seems to work correctly apart from 
when I want to calculate the hex equivelent of the decimal 
number -  4294967295. This number is of particular 
significance as in Hex this should be FFFFFFFF (a 32 bit, 
bitmask; i am using xml to describe registers in h/w).
The template outputs FFFFFFF0 abnd I dont know why.

The template seems to output the incorrect value for 
1099511627775, which is the decimal representation of 

The recursive template is as follows:

<xsl:variable name="hexDigits" select="'0123456789ABCDEF'" />
  <xsl:template name="toHex">
    <xsl:param name="decimalNumber" />
    <xsl:if test="$decimalNumber >= 16">
      <xsl:call-template name="toHex">
        <xsl:with-param name="decimalNumber" select="floor($decimalNumber div 16)" />
    <xsl:value-of select="substring($hexDigits, ($decimalNumber mod 16) + 1, 1)" />

Can anybody figure out why this is happening or have an 
equivelent template that can calculate the conversion 

Thankyou for your time.

Peter Doggett

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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