Extract decimal part into variable in XSL template - xslt

Question

I need to store the 2 places after decimal (currency amount, so need only upto 2 places) in an XSL variable before I do a ceil function.
<xsl:element name="BaseFare"><xsl:value-of select="ceiling(BaseAmount/Amount * (1 - ($promoDisc div 100)))"/></xsl:element>
For eg. if the result of the Amount is 499 and promoDisc = 8%, then the discounted Amount would be 459.08 - I need to store "08" (with the zero) in a variable for use later, while I return the ceiling amount (460) in the output XML. Thought I could just do a string function and read 2 chars after the decimal into a variable rather than do any math?

Answer 1

There are different ways to do this extraction:
I. Using the string representation of the number:
concat('.',substring(substring-after($x, '.'), 1, 2))
II. Using standard math functions:
$x - floor($x)
This evaluates to the decimal part of any positive number $x.
Use one of the functions: format-number(), round(), round-half-to-even() (the last function available only XPath 2.0 / XSLT 2.0) to round it to two decimal places.
In XSLT 1.0 one way to get from a positive number exactly the digits in the two decimal places after the decimal point (truncate without rounding), is:
format-number(
floor(100* $x) div 100
-
floor(floor(100* $x) div 100),
'.00'
)
Here is a complete example of the described methods:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/">
<xsl:value-of select=
"concat('.',substring(substring-after(0.12543, '.'), 1, 2))"/>
=========
<xsl:value-of select=
"format-number(0.12543, '.00')"/>
=========
<xsl:value-of select=
"format-number(
floor(100* 999.12543) div 100
-
floor(floor(100* 999.12543) div 100),
'.00'
)
"/>
</xsl:template>
</xsl:stylesheet>
When this transformation is applied on any XML document (not used), the result is:
.12
=========
.13
=========
.12