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authorKartik K. Agaram <vc@akkartik.com>2021-02-14 14:30:46 -0800
committerKartik K. Agaram <vc@akkartik.com>2021-02-14 14:30:46 -0800
commit4961a020b47d89a09ed5cbcf51ddac2b3e8bfcc2 (patch)
tree70b405e0ae039ba1d99968c8a9c4728e5cb36e0a /html/apps/browse
parent1a9d3cb7efa84c0399fc852b93021eff89195d9d (diff)
downloadmu-4961a020b47d89a09ed5cbcf51ddac2b3e8bfcc2.tar.gz
7741 - baremetal/shell: first run: single number
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<head>
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<title>Mu - tangle.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: constructing recipes out of order</span>
<span class="Comment">#</span>
<span class="Comment"># We construct a factorial function with separate base and recursive cases.</span>
<span class="Comment"># Compare factorial.mu.</span>
<span class="Comment">#</span>
<span class="Comment"># This isn't a very tasteful example, just a simple demonstration of</span>
<span class="Comment"># possibilities.</span>

<span class="muRecipe">recipe</span> factorial [
  <span class="Constant">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  n:number<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
<span class="Constant">    +base-case</span>
  <span class="Delimiter">}</span>
<span class="Constant">  +recursive-case</span>
]

<span class="muRecipe">after</span> +base-case [
  <span class="Comment"># if n=0 return 1</span>
  zero?:boolean<span class="Special"> &lt;- </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="muRecipe">after</span> +recursive-case [
  <span class="Comment"># return n * factorial(n - 1)</span>
  x:number<span class="Special"> &lt;- </span>subtract n:number, <span class="Constant">1:literal</span>
  subresult:number<span class="Special"> &lt;- </span>factorial x:number
  result:number<span class="Special"> &lt;- </span>multiply subresult:number, n:number
  <span class="muControl">reply</span> result:number
]

<span class="muRecipe">recipe</span> main [
  1:number<span class="Special"> &lt;- </span>factorial <span class="Constant">5:literal</span>
  $print <span class="Constant">[result: ]</span>, 1:number, [
]
]
</pre>
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