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<title>Mu - factorial.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: compute the factorial of 5</span>
<span class="muRecipe">recipe</span> main [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
x:number<span class="Special"> <- </span>factorial <span class="Constant">5:literal</span>
$print <span class="Constant">[result: ]</span>, x:number, <span class="Constant">[ </span>
<span class="Constant">]</span>
]
<span class="muRecipe">recipe</span> factorial [
<span class="Constant">default-space</span>:address:array:location<span class="Special"> <- </span>new location:type, <span class="Constant">30:literal</span>
n:number<span class="Special"> <- </span><span class="Constant">next-ingredient</span>
<span class="Delimiter">{</span>
<span class="Comment"># if n=0 return 1</span>
zero?:boolean<span class="Special"> <- </span>equal n:number, <span class="Constant">0:literal</span>
<span class="muControl">break-unless</span> zero?:boolean
<span class="muControl">reply</span> <span class="Constant">1:literal</span>
<span class="Delimiter">}</span>
<span class="Comment"># return n * factorial(n-1)</span>
x:number<span class="Special"> <- </span>subtract n:number, <span class="Constant">1:literal</span>
subresult:number<span class="Special"> <- </span>factorial x:number
result:number<span class="Special"> <- </span>multiply subresult:number, n:number
<span class="muControl">reply</span> result:number
]
<span class="Comment"># unit test</span>
<span class="muScenario">scenario</span> factorial-test [
run [
1:number<span class="Special"> <- </span>factorial <span class="Constant">5:literal</span>
]
memory-should-contain [
1<span class="Special"> <- </span>120
]
]
</pre>
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