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<a href='https://github.com/akkartik/mu/blob/master/068random.mu'>https://github.com/akkartik/mu/blob/master/068random.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muRecipe">def</span> <a href='068random.mu.html#L1'>random</a> generator:&:<a href='066stream.mu.html#L2'>stream</a>:num<span class="muRecipe"> -> </span>result:num, fail?:bool, generator:&:<a href='066stream.mu.html#L2'>stream</a>:num [
<span id="L2" class="LineNr"> 2 </span> <span class="Constant">local-scope</span>
<span id="L3" class="LineNr"> 3 </span> <span class="Constant">load-inputs</span>
<span id="L4" class="LineNr"> 4 </span> <span class="Delimiter">{</span>
<span id="L5" class="LineNr"> 5 </span> <span class="muControl">break-if</span> generator
<span id="L6" class="LineNr"> 6 </span> <span class="Comment"># generator is 0? use real random-number generator</span>
<span id="L7" class="LineNr"> 7 </span> result <span class="Special"><-</span> real-random
<span id="L8" class="LineNr"> 8 </span> <span class="muControl"> return</span> result,<span class="Constant"> false</span>
<span id="L9" class="LineNr"> 9 </span> <span class="Delimiter">}</span>
<span id="L10" class="LineNr">10 </span> result, fail?, generator <span class="Special"><-</span> read generator
<span id="L11" class="LineNr">11 </span>]
<span id="L12" class="LineNr">12 </span>
<span id="L13" class="LineNr">13 </span><span class="Comment"># helper for tests</span>
<span id="L14" class="LineNr">14 </span><span class="muRecipe">def</span> <a href='068random.mu.html#L14'>assume-random-numbers</a><span class="muRecipe"> -> </span>result:&:<a href='066stream.mu.html#L2'>stream</a>:num [
<span id="L15" class="LineNr">15 </span> <span class="Constant">local-scope</span>
<span id="L16" class="LineNr">16 </span> <span class="Constant">load-inputs</span>
<span id="L17" class="LineNr">17 </span> <span class="Comment"># compute result-len, space to allocate in result</span>
<span id="L18" class="LineNr">18 </span> result-len:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span id="L19" class="LineNr">19 </span> <span class="Delimiter">{</span>
<span id="L20" class="LineNr">20 </span> _, arg-received?:bool <span class="Special"><-</span> <span class="Constant">next-input</span>
<span id="L21" class="LineNr">21 </span> <span class="muControl">break-unless</span> arg-received?
<span id="L22" class="LineNr">22 </span> result-len <span class="Special"><-</span> add result-len,<span class="Constant"> 1</span>
<span id="L23" class="LineNr">23 </span> <span class="muControl"> loop</span>
<span id="L24" class="LineNr">24 </span> <span class="Delimiter">}</span>
<span id="L25" class="LineNr">25 </span> <span class="Constant">rewind-inputs</span>
<span id="L26" class="LineNr">26 </span> result-data:&:@:num <span class="Special"><-</span> new <span class="Constant">number:type</span>, result-len
<span id="L27" class="LineNr">27 </span> idx:num <span class="Special"><-</span> copy<span class="Constant"> 0</span>
<span id="L28" class="LineNr">28 </span> <span class="Delimiter">{</span>
<span id="L29" class="LineNr">29 </span> curr:num, arg-received?:bool <span class="Special"><-</span> <span class="Constant">next-input</span>
<span id="L30" class="LineNr">30 </span> <span class="muControl">break-unless</span> arg-received?
<span id="L31" class="LineNr">31 </span> *result-data <span class="Special"><-</span> put-index *result-data, idx, curr
<span id="L32" class="LineNr">32 </span> idx <span class="Special"><-</span> add idx,<span class="Constant"> 1</span>
<span id="L33" class="LineNr">33 </span> <span class="muControl"> loop</span>
<span id="L34" class="LineNr">34 </span> <span class="Delimiter">}</span>
<span id="L35" class="LineNr">35 </span> result <span class="Special"><-</span> <a href='066stream.mu.html#L7'>new-stream</a> result-data
<span id="L36" class="LineNr">36 </span>]
<span id="L37" class="LineNr">37 </span>
<span id="L38" class="LineNr">38 </span><span class="muScenario">scenario</span> random-numbers-in-scenario [
<span id="L39" class="LineNr">39 </span> <span class="Constant">local-scope</span>
<span id="L40" class="LineNr">40 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='066stream.mu.html#L2'>stream</a>:num <span class="Special"><-</span> <a href='068random.mu.html#L14'>assume-random-numbers</a><span class="Constant"> 34</span>,<span class="Constant"> 35</span>,<span class="Constant"> 37</span>
<span id="L41" class="LineNr">41 </span> 1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special"><-</span> <a href='068random.mu.html#L1'>random</a> <a href='075channel.mu.html#L36'>source</a>
<span id="L42" class="LineNr">42 </span> 3:num/<span class="Special">raw</span>, 4:bool/<span class="Special">raw</span> <span class="Special"><-</span> <a href='068random.mu.html#L1'>random</a> <a href='075channel.mu.html#L36'>source</a>
<span id="L43" class="LineNr">43 </span> 5:num/<span class="Special">raw</span>, 6:bool/<span class="Special">raw</span> <span class="Special"><-</span> <a href='068random.mu.html#L1'>random</a> <a href='075channel.mu.html#L36'>source</a>
<span id="L44" class="LineNr">44 </span> 7:num/<span class="Special">raw</span>, 8:bool/<span class="Special">raw</span> <span class="Special"><-</span> <a href='068random.mu.html#L1'>random</a> <a href='075channel.mu.html#L36'>source</a>
<span id="L45" class="LineNr">45 </span> memory-should-contain [
<span id="L46" class="LineNr">46 </span> <span class="Constant"> 1</span> <span class="Special"><-</span><span class="Constant"> 34</span>
<span id="L47" class="LineNr">47 </span> <span class="Constant"> 2</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># everything went well</span>
<span id="L48" class="LineNr">48 </span> <span class="Constant"> 3</span> <span class="Special"><-</span><span class="Constant"> 35</span>
<span id="L49" class="LineNr">49 </span> <span class="Constant"> 4</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># everything went well</span>
<span id="L50" class="LineNr">50 </span> <span class="Constant"> 5</span> <span class="Special"><-</span><span class="Constant"> 37</span>
<span id="L51" class="LineNr">51 </span> <span class="Constant"> 6</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># everything went well</span>
<span id="L52" class="LineNr">52 </span> <span class="Constant"> 7</span> <span class="Special"><-</span><span class="Constant"> 0</span> <span class="Comment"># empty result</span>
<span id="L53" class="LineNr">53 </span> <span class="Constant"> 8</span> <span class="Special"><-</span><span class="Constant"> 1</span> <span class="Comment"># end of stream</span>
<span id="L54" class="LineNr">54 </span> ]
<span id="L55" class="LineNr">55 </span>]
<span id="L56" class="LineNr">56 </span>
<span id="L57" class="LineNr">57 </span><span class="Comment"># generate a random integer in the semi-open interval [start, end)</span>
<span id="L58" class="LineNr">58 </span><span class="muRecipe">def</span> <a href='068random.mu.html#L58'>random-in-range</a> generator:&:<a href='066stream.mu.html#L2'>stream</a>:num, start:num, end:num<span class="muRecipe"> -> </span>result:num, fail?:bool, generator:&:<a href='066stream.mu.html#L2'>stream</a>:num [
<span id="L59" class="LineNr">59 </span> <span class="Constant">local-scope</span>
<span id="L60" class="LineNr">60 </span> <span class="Constant">load-inputs</span>
<span id="L61" class="LineNr">61 </span> result, fail?, generator <span class="Special"><-</span> <a href='068random.mu.html#L1'>random</a> generator
<span id="L62" class="LineNr">62 </span> <span class="muControl">return-if</span> fail?
<span id="L63" class="LineNr">63 </span> delta:num <span class="Special"><-</span> subtract end, start
<span id="L64" class="LineNr">64 </span> _, result <span class="Special"><-</span> divide-with-remainder result, delta
<span id="L65" class="LineNr">65 </span> result <span class="Special"><-</span> add result, start
<span id="L66" class="LineNr">66 </span>]
<span id="L67" class="LineNr">67 </span>
<span id="L68" class="LineNr">68 </span><span class="muScenario">scenario</span> <a href='068random.mu.html#L58'>random-in-range</a> [
<span id="L69" class="LineNr">69 </span> <span class="Constant">local-scope</span>
<span id="L70" class="LineNr">70 </span> <a href='075channel.mu.html#L36'>source</a>:&:<a href='066stream.mu.html#L2'>stream</a>:num <span class="Special"><-</span> <a href='068random.mu.html#L14'>assume-random-numbers</a><span class="Constant"> 91</span>
<span id="L71" class="LineNr">71 </span> 1:num/<span class="Special">raw</span> <span class="Special"><-</span> <a href='068random.mu.html#L58'>random-in-range</a> <a href='075channel.mu.html#L36'>source</a>,<span class="Constant"> 40</span>,<span class="Constant"> 50</span>
<span id="L72" class="LineNr">72 </span> memory-should-contain [
<span id="L73" class="LineNr">73 </span> <span class="Constant"> 1</span> <span class="Special"><-</span><span class="Constant"> 41</span>
<span id="L74" class="LineNr">74 </span> ]
<span id="L75" class="LineNr">75 </span>]
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