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layout: default
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title: "Interacting"
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parent: Normal
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ancestor: Funcons-beta
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---
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[Funcons-beta] : [Interacting.cbs]
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-----------------------------
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### Interacting
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#### Output
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<div class="highlighter-rouge"><pre class="highlight"><code>[
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<i class="keyword">Entity</i> <span class="name"><a href="#Name_standard-out">standard-out</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_print">print</a></span>
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]</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Entity</i>
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_ -- <span class="ent-name"><span id="Name_standard-out">standard-out</span></span>!(_:<span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span><sup class="sup">*</sup>) -> _</code></pre></div>
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This entity represents the sequence of values output by a particular
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transition, where the empty sequence <code>( )</code> represents the lack of output.
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Composition of transitions concatenates their output sequences.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_print">print</span></span>(_:<span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span><sup class="sup">*</sup>) : =><span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-type">null-type</a></span></code></pre></div>
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<code><span class="name"><a href="#Name_print">print</a></span>(<i class="var">X<sup class="sup">*</sup></i>)</code> evaluates the arguments <code><i class="var">X<sup class="sup">*</sup></i></code> and emits the resulting sequence of
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values on the standard-out channel. <code><span class="name"><a href="#Name_print">print</a></span>( )</code> has no effect.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="#Name_print">print</a></span>(<span id="Variable137_V*"><i class="var">V<sup class="sup">*</sup></i></span>:<span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span><sup class="sup">*</sup>) -- <span class="ent-name"><a href="#Name_standard-out">standard-out</a></span>!(<a href="#Variable137_V*"><i class="var">V<sup class="sup">*</sup></i></a>) -> <span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-value">null-value</a></span></code></pre></div>
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#### Input
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<div class="highlighter-rouge"><pre class="highlight"><code>[
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<i class="keyword">Entity</i> <span class="name"><a href="#Name_standard-in">standard-in</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_read">read</a></span>
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]</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Entity</i>
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_ -- <span class="ent-name"><span id="Name_standard-in">standard-in</span></span>?(_:<span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span><sup class="sup">*</sup>) -> _</code></pre></div>
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This entity represents the sequence of values input by a particular
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transition, where the empty sequence <code>( )</code> represents that no values are
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input. The value <code><span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-value">null-value</a></span></code> represents the end of the input.
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Composition of transitions concatenates their input sequences, except that
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when the first sequence ends with <code><span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-value">null-value</a></span></code>, the second seqeunce has to be
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just <code><span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-value">null-value</a></span></code>.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_read">read</span></span> : =><span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></code></pre></div>
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<code><span class="name"><a href="#Name_read">read</a></span></code> inputs a single value from the standard-in channel, and returns it.
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If the end of the input has been reached, <code><span class="name"><a href="#Name_read">read</a></span></code> fails.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="#Name_read">read</a></span> -- <span class="ent-name"><a href="#Name_standard-in">standard-in</a></span>?(<span id="Variable309_V"><i class="var">V</i></span>:~<span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-type">null-type</a></span>) -> <a href="#Variable309_V"><i class="var">V</i></a>
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_read">read</a></span> -- <span class="ent-name"><a href="#Name_standard-in">standard-in</a></span>?(<span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-value">null-value</a></span>) -> <span class="name"><a href="../../Abnormal/Failing/index.html#Name_fail">fail</a></span></code></pre></div>
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____
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From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
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[Interacting.cbs]: Interacting.cbs
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"CBS SOURCE FILE"
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[Funcons-beta]: /CBS-beta/docs/Funcons-beta
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"FUNCONS-BETA"
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[Unstable-Funcons-beta]: /CBS-beta/docs/Unstable-Funcons-beta
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"UNSTABLE-FUNCONS-BETA"
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[Languages-beta]: /CBS-beta/docs/Languages-beta
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"LANGUAGES-BETA"
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[Unstable-Languages-beta]: /CBS-beta/docs/Unstable-Languages-beta
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"UNSTABLE-LANGUAGES-BETA"
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[CBS-beta]: /CBS-beta "CBS-BETA"
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[PLanCompS Project]: https://plancomps.github.io
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"PROGRAMMING LANGUAGE COMPONENTS AND SPECIFICATIONS PROJECT HOME PAGE"
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[CBS-beta issues...]: https://github.com/plancomps/CBS-beta/issues
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"CBS-BETA ISSUE REPORTS ON GITHUB"
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[Suggest an improvement...]: mailto:plancomps@gmail.com?Subject=CBS-beta%20-%20comment&Body=Re%3A%20CBS-beta%20specification%20at%20Computations/Normal/Interacting/Interacting.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
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"GENERATE AN EMAIL TEMPLATE"
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