Do you absolutely want truncation (so 4.99 becomes 4.9) or will rounding do (so
4.99 becomes 5.0)?
If rounding will do, then use round($x, -$desired-digits).
If you really want truncation then consider the "idiv" operator, for example
(4.99 * 10 idiv 10) gives 4.9: you can construct the value 10 as math:pow(10,
$desired-digits).
Michael Kay
Saxonica
On 23 Jun 2020, at 15:28, Roger L Costello costello(_at_)mitre(_dot_)org
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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>
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