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Towers of Hanoi: Difference between revisions
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(provide verbose approach) |
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<xsl:call-template name="hanoi"><xsl:with-param name="n" select="4"/></xsl:call-template>
=={{header|XQuery}}==
<lang xquery>
declare function local:hanoi($disk as xs:integer, $from as xs:integer,
$to as xs:integer, $via as xs:integer) as element()*
{
if($disk > 0)
then (
local:hanoi($disk - 1, $from, $via, $to),
<move disk='{$disk}'><from>{$from}</from><to>{$to}</to></move>,
local:hanoi($disk - 1, $via, $to, $from)
)
else ()
};
<hanoi>
{
local:hanoi(4, 1, 2, 3)
}
</hanoi>
</lang>
Result is:
<lang xml>
<?xml version="1.0" encoding="UTF-8"?>
<hanoi>
<move disk="1">
<from>1</from>
<to>3</to>
</move>
<move disk="2">
<from>1</from>
<to>2</to>
</move>
<move disk="1">
<from>3</from>
<to>2</to>
</move>
<move disk="3">
<from>1</from>
<to>3</to>
</move>
<move disk="1">
<from>2</from>
<to>1</to>
</move>
<move disk="2">
<from>2</from>
<to>3</to>
</move>
<move disk="1">
<from>1</from>
<to>3</to>
</move>
<move disk="4">
<from>1</from>
<to>2</to>
</move>
<move disk="1">
<from>3</from>
<to>2</to>
</move>
<move disk="2">
<from>3</from>
<to>1</to>
</move>
<move disk="1">
<from>2</from>
<to>1</to>
</move>
<move disk="3">
<from>3</from>
<to>2</to>
</move>
<move disk="1">
<from>1</from>
<to>3</to>
</move>
<move disk="2">
<from>1</from>
<to>2</to>
</move>
<move disk="1">
<from>3</from>
<to>2</to>
</move>
</hanoi>
</lang>
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