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<div class="refentry" title="!=">
<a id="notequal"></a>
<div class="titlepage"></div>
<a id="IndexNotEqualColon" class="indexterm"></a>
<a id="IndexNotEqualQuestion" class="indexterm"></a>
<a id="IndexNotEqualExpression" class="indexterm"></a>
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<h2>
<span class="refentrytitle">!=</span>
</h2>
<p>!= —
Determines if one value is not equal to another.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp12132736"></a>
<h2>Description</h2>
<p>
Determines if one value is not equal to another.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp12221120"></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" title="Performance">
<a id="idp12224440"></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> not 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>.
</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" title="Examples">
<a id="idp12230448"></a>
<h2>Examples</h2>
<p>
Here is an example of the != operator. It uses the file <a class="ulink" href="examples/notequal.csd" target="_top"><em class="citetitle">notequal.csd</em></a>.
</p>
<div class="example">
<a id="idp12231440"></a>
<p class="title">
<strong>Example 10. 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>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o notequal.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
ipch <span class="op">=</span> <span class="opc">cpspch</span>(p4)
iprint <span class="op">=</span> p5
<span class="octrl">if</span> (iprint <span class="op">!=</span> 1) <span class="octrl">igoto</span> <span class="olabel">skipPrint</span>
<span class="opc">print</span> ipch
asig <span class="opc">vco2</span> .7, ipch
<span class="opc">outs</span> asig, asig
<span class="olabel">skipPrint</span><span class="op">:</span>
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 65536 10 1 <span class="comment">;sine wave</span>
<span class="stamnt">i</span>1 0 .5 8.00 0
<span class="stamnt">i</span>1 0 .5 8.01 1 <span class="comment">; this note will print it's ipch value and only this one will be played</span>
<span class="stamnt">i</span>1 0 .5 8.02 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">
instr 1: ipch = 277.167</pre>
<p>
</p>
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<div class="refsect1" title="See Also">
<a id="idp12234176"></a>
<h2>See Also</h2>
<p>
<a class="link" href="equals.html" title="=="><em class="citetitle">==</em></a>,
<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>
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