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<div class="refentry"><a id="equals"></a><div class="titlepage"></div><a id="IndexEqualsColon" class="indexterm"></a><a id="IndexEqualsQuestion" class="indexterm"></a><a id="IndexEqualsExpression" class="indexterm"></a><a id="IndexEquals" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">==</span></h2><p>== —
Compares two values for equality.
</p></div><div class="refsect1"><a id="idm281472952858872"></a><h2>Description</h2><p>
Compares two values for equality.
</p></div><div class="refsect1"><a id="idm281472952857544"></a><h2>Syntax</h2><pre class="synopsis">(a <span class="command"><strong>==</strong></span> b <span class="command"><strong>?</strong></span> v1 <span class="command"><strong>:</strong></span> v2)</pre><p>
where <span class="emphasis"><em>a</em></span>, <span class="emphasis"><em>b</em></span>, <span class="emphasis"><em>v1</em></span> and <span class="emphasis"><em>v2</em></span> may be expressions, but <span class="emphasis"><em>a</em></span>, <span class="emphasis"><em>b</em></span> not audio-rate.
</p></div><div class="refsect1"><a id="idm281472952851128"></a><h2>Performance</h2><p>
In the above conditional, <span class="emphasis"><em>a</em></span> and <span class="emphasis"><em>b</em></span> are first compared. If the indicated relation is true (<span class="emphasis"><em>a</em></span> is equal to <span class="emphasis"><em>b</em></span>), then the conditional expression has the value of <span class="emphasis"><em>v1</em></span>; if the relation is false, the expression has the value of <span class="emphasis"><em>v2</em></span>. (For convenience, a sole "<span class="emphasis"><em>=</em></span>" will function as "<span class="emphasis"><em>= =</em></span>".)
</p><p>
NB.: If <span class="emphasis"><em>v1</em></span> or <span class="emphasis"><em>v2</em></span> are expressions, these will be evaluated before the conditional is determined.
</p><p>
In terms of binding strength, all conditional operators (i.e. the relational operators (<span class="emphasis"><em><</em></span>, etc.), and <span class="emphasis"><em>?</em></span>, and <span class="emphasis"><em>:</em></span> ) are weaker than the arithmetic and logical operators (<span class="emphasis"><em>+</em></span>, <span class="emphasis"><em>-</em></span>, <span class="emphasis"><em>*</em></span>, <span class="emphasis"><em>/</em></span>, <span class="emphasis"><em>&&</em></span> and <span class="emphasis"><em>||</em></span>).
</p><p>
These are <span class="emphasis"><em>operators</em></span> not <span class="emphasis"><em>opcodes</em></span>. Therefore, they can be used within orchestra statements, but do not form complete statements themselves.
</p></div><div class="refsect1"><a id="idm281472952839112"></a><h2>Examples</h2><p>
Here is an example of the == operator. It uses the file <a class="ulink" href="examples/equals.csd" target="_top"><em class="citetitle">equals.csd</em></a>.
</p><div class="example"><a id="idm281472952837256"></a><p class="title"><strong>Example 33. Example of the == operator.</strong></p><div class="example-contents"><p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p><div class="refsect1"><a id="idm281472788471352"></a><pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o equals.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">env</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">;choose envelope in score</span>
<span class="k">if</span> <span class="p">(</span>i<span class="n">env</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="k">kthen</span>
k<span class="n">env</span> <span class="nb">adsr</span> <span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.95</span><span class="p">,</span> <span class="mf">0.05</span> <span class="c1">;sustained envelope</span>
<span class="k">elseif</span> <span class="p">(</span>i<span class="n">env</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span> <span class="k">kthen</span>
k<span class="n">env</span> <span class="nb">adsr</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.5</span> <span class="c1">;triangular envelope</span>
<span class="k">elseif</span> <span class="p">(</span>i<span class="n">env</span> <span class="o">==</span> <span class="mi">2</span><span class="p">)</span> <span class="k">kthen</span>
k<span class="n">env</span> <span class="nb">adsr</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span> <span class="c1">;ramp up</span>
<span class="k">endif</span>
a<span class="n">out</span> <span class="nb">vco2</span> <span class="mf">.1</span><span class="p">,</span> <span class="mi">110</span><span class="p">,</span> <span class="mi">10</span>
a<span class="n">out</span> <span class="o">=</span> a<span class="n">out</span> <span class="o">*</span> k<span class="n">env</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mi">0</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">3</span> <span class="mi">2</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">6</span> <span class="mi">2</span> <span class="mi">2</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre></div></div></div><p><br class="example-break" />
</p></div><div class="refsect1"><a id="idm281472952833064"></a><h2>See Also</h2><p>
<a class="link" href="greaterequal.html" title=">="><em class="citetitle">>=</em></a>,
<a class="link" href="greaterthan.html" title=">"><em class="citetitle">></em></a>,
<a class="link" href="lessequal.html" title="<="><em class="citetitle"><=</em></a>,
<a class="link" href="lessthan.html" title="<"><em class="citetitle"><</em></a>,
<a class="link" href="notequal.html" title="!="><em class="citetitle">!=</em></a>
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