## Re: [xsl] Function that reduces the number of digits to the right of the decimal point?

 Subject: Re: [xsl] Function that reduces the number of digits to the right of the decimal point? From: "David Carlisle d.p.carlisle@xxxxxxxxx" Date: Tue, 23 Jun 2020 14:49:42 -0000
```https://www.w3.org/TR/xpath-functions/#func-round

?

David

On Tue, 23 Jun 2020 at 15:28, Roger L Costello costello@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Hi Folks,
>
> \$num is a variable holding a decimal value.
>
> \$desired-number-of-digits-after-decimal-point is a variable holding an
> integer value.
>
> I want a function that reduces the number of digits to the right of the
> decimal point in \$num according to the value specified in
> \$desired-number-of-digits-after-decimal-point
>
> Example #1:
> \$num = 42.366978
> \$desired-number-of-digits-after-decimal-point = 2
> The result of applying the function is: 42.36
>
> Example #2:
> \$num = 42.366978
> \$desired-number-of-digits-after-decimal-point = 0
> The result of applying the function is: 42
>
> Below is one way to implement the function. Is there a better way? By
> "better" I mean simpler, more correct.
>
> Also, is there a better name for the function?  By "better" I mean
> shorter, more standardized. /Roger
> -----------------------------------------------------
> <xsl:function name="f:reduce-number-of-digits-after-decimal-point"
> as="xs:string">
>     <xsl:param name="num" as="xs:string" />
>     <xsl:param name="desired-number-of-digits-after-decimal-point"
> as="xs:integer" />
>
>     <xsl:variable name="whole-part" select="substring-before(\$num, '.')"/>
>     <xsl:variable name="fraction-part" select="substring-after(\$num,
> '.')"/>
>     <xsl:variable name="reduced-fraction-part"
> select="substring(\$fraction-part, 1,
> \$desired-number-of-digits-after-decimal-point)"/>
>     <xsl:choose>
>         <xsl:when test="\$desired-number-of-digits-after-decimal-point gt
> 0">
>             <xsl:value-of select="concat(\$whole-part, '.',
> \$reduced-fraction-part)"/>
>         </xsl:when>
>         <xsl:otherwise>
>             <xsl:value-of select="\$whole-part"/>
>         </xsl:otherwise>
>     </xsl:choose>
> </xsl:function>

```