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<a href='https://github.com/akkartik/mu/blob/main/linux/apps/factorial.mu'>https://github.com/akkartik/mu/blob/main/linux/apps/factorial.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># compute the factorial of 5, and return the result in the exit code</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># $ ./translate apps/factorial.mu</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># $ ./a.elf</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># $ echo $?</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># 120</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment">#</span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># You can also run the automated test suite:</span>
<span id="L10" class="LineNr">10 </span><span class="muComment"># $ ./a.elf test</span>
<span id="L11" class="LineNr">11 </span><span class="muComment"># Expected output:</span>
<span id="L12" class="LineNr">12 </span><span class="muComment"># ........</span>
<span id="L13" class="LineNr">13 </span><span class="muComment"># Every '.' indicates a passing test. Failing tests get a 'F'.</span>
<span id="L14" class="LineNr">14 </span><span class="muComment"># There's only one test in this file, but you'll also see tests running from</span>
<span id="L15" class="LineNr">15 </span><span class="muComment"># Mu's standard library.</span>
<span id="L16" class="LineNr">16 </span><span class="muComment">#</span>
<span id="L17" class="LineNr">17 </span><span class="muComment"># Compare factorial4.subx</span>
<span id="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='factorial.mu.html#L19'>factorial</a></span> n: int<span class="PreProc"> -> </span>_/eax: int <span class="Delimiter">{</span>
<span id="L20" class="LineNr">20 </span> compare n, <span class="Constant">1</span>
<span id="L21" class="LineNr">21 </span> <span class="muComment"># if (n <= 1) return 1</span>
<span id="L22" class="LineNr">22 </span> <span class="Delimiter">{</span>
<span id="L23" class="LineNr">23 </span> <span class="PreProc">break-if-></span>
<span id="L24" class="LineNr">24 </span> <span class="PreProc">return</span> <span class="Constant">1</span>
<span id="L25" class="LineNr">25 </span> <span class="Delimiter">}</span>
<span id="L26" class="LineNr">26 </span> <span class="muComment"># n > 1; return n * factorial(n-1)</span>
<span id="L27" class="LineNr">27 </span> <span class="PreProc">var</span> tmp/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy n
<span id="L28" class="LineNr">28 </span> tmp <span class="Special"><-</span> decrement
<span id="L29" class="LineNr">29 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> <a href='factorial.mu.html#L19'>factorial</a> tmp
<span id="L30" class="LineNr">30 </span> result <span class="Special"><-</span> multiply n
<span id="L31" class="LineNr">31 </span> <span class="PreProc">return</span> result
<span id="L32" class="LineNr">32 </span><span class="Delimiter">}</span>
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span><span class="PreProc">fn</span> <span class="muTest"><a href='factorial.mu.html#L34'>test-factorial</a></span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr">35 </span> <span class="PreProc">var</span> result/eax: int <span class="Special"><-</span> <a href='factorial.mu.html#L19'>factorial</a> <span class="Constant">5</span>
<span id="L36" class="LineNr">36 </span> <a href='../102test.subx.html#L23'>check-ints-equal</a> result, <span class="Constant">0x78</span>, <span class="Constant">"F - test-factorial"</span>
<span id="L37" class="LineNr">37 </span><span class="Delimiter">}</span>
<span id="L38" class="LineNr">38 </span>
<span id="L39" class="LineNr">39 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='factorial.mu.html#L39'>main</a></span> args-on-stack: (addr array addr array byte)<span class="PreProc"> -> </span>_/<span class="muRegEbx">ebx</span>: int <span class="Delimiter">{</span>
<span id="L40" class="LineNr">40 </span> <span class="PreProc">var</span> args/eax: (addr array addr array byte) <span class="Special"><-</span> copy args-on-stack
<span id="L41" class="LineNr">41 </span> <span class="muComment"># len = length(args)</span>
<span id="L42" class="LineNr">42 </span> <span class="PreProc">var</span> len/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> length args
<span id="L43" class="LineNr">43 </span> <span class="muComment"># if (len <= 1) return factorial(5)</span>
<span id="L44" class="LineNr">44 </span> compare len, <span class="Constant">1</span>
<span id="L45" class="LineNr">45 </span> <span class="Delimiter">{</span>
<span id="L46" class="LineNr">46 </span> <span class="PreProc">break-if-></span>
<span id="L47" class="LineNr">47 </span> <span class="PreProc">var</span> exit-status/eax: int <span class="Special"><-</span> <a href='factorial.mu.html#L19'>factorial</a> <span class="Constant">5</span>
<span id="L48" class="LineNr">48 </span> <span class="PreProc">return</span> exit-status
<span id="L49" class="LineNr">49 </span> <span class="Delimiter">}</span>
<span id="L50" class="LineNr">50 </span> <span class="muComment"># if (args[1] == "test") run-tests()</span>
<span id="L51" class="LineNr">51 </span> <span class="PreProc">var</span> tmp2/<span class="muRegEcx">ecx</span>: (addr addr array byte) <span class="Special"><-</span> index args, <span class="Constant">1</span>
<span id="L52" class="LineNr">52 </span> <span class="PreProc">var</span> tmp3/eax: boolean <span class="Special"><-</span> <a href='../105string-equal.subx.html#L15'>string-equal?</a> *tmp2, <span class="Constant">"test"</span>
<span id="L53" class="LineNr">53 </span> compare tmp3, <span class="Constant">0</span>
<span id="L54" class="LineNr">54 </span> <span class="Delimiter">{</span>
<span id="L55" class="LineNr">55 </span> <span class="PreProc">break-if-=</span>
<span id="L56" class="LineNr">56 </span> run-tests
<span id="L57" class="LineNr">57 </span> <span class="muComment"># TODO: get at Num-test-failures somehow</span>
<span id="L58" class="LineNr">58 </span> <span class="Delimiter">}</span>
<span id="L59" class="LineNr">59 </span> <span class="PreProc">return</span> <span class="Constant">0</span>
<span id="L60" class="LineNr">60 </span><span class="Delimiter">}</span>
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