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<refentry id="equals">
<indexterm id="IndexEqualsColon"><primary>:</primary></indexterm>
<indexterm id="IndexEqualsQuestion"><primary>?</primary></indexterm>
<indexterm id="IndexEqualsExpression"><primary>conditional expressions</primary></indexterm>
<indexterm id="IndexEquals"><primary>==</primary></indexterm>
<refentryinfo><title>Instrument Control:Conditional Values</title></refentryinfo>
<refmeta>
<refentrytitle>==</refentrytitle>
</refmeta>
<refnamediv>
<refname>==</refname>
<refpurpose>
Compares two values for equality.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Compares two values for equality.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>(a <command>==</command> b <command>?</command> v1 <command>:</command> v2)</synopsis>
<para>
where <emphasis>a</emphasis>, <emphasis>b</emphasis>, <emphasis>v1</emphasis> and <emphasis>v2</emphasis> may be expressions, but <emphasis>a</emphasis>, <emphasis>b</emphasis> not audio-rate.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
In the above conditional, <emphasis>a</emphasis> and <emphasis>b</emphasis> are first compared. If the indicated relation is true (<emphasis>a</emphasis> is equal to <emphasis>b</emphasis>), then the conditional expression has the value of <emphasis>v1</emphasis>; if the relation is false, the expression has the value of <emphasis>v2</emphasis>. (For convenience, a sole "<emphasis>=</emphasis>" will function as "<emphasis>= =</emphasis>".)
</para>
<para>
NB.: If <emphasis>v1</emphasis> or <emphasis>v2</emphasis> are expressions, these will be evaluated before the conditional is determined.
</para>
<para>
In terms of binding strength, all conditional operators (i.e. the relational operators (<emphasis><</emphasis>, etc.), and <emphasis>?</emphasis>, and <emphasis>:</emphasis> ) are weaker than the arithmetic and logical operators (<emphasis>+</emphasis>, <emphasis>-</emphasis>, <emphasis>*</emphasis>, <emphasis>/</emphasis>, <emphasis>&&</emphasis> and <emphasis>||</emphasis>).
</para>
<para>
These are <emphasis>operators</emphasis> not <emphasis>opcodes</emphasis>. Therefore, they can be used within orchestra statements, but do not form complete statements themselves.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the == operator. It uses the file <ulink url="examples/equals.csd"><citetitle>equals.csd</citetitle></ulink>.
<example>
<title>Example of the == operator.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/equals.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
Its output should include lines like this:
<screen>
k1 = 2.000000, k2 = 0.000000
k1 = 3.000000, k2 = 1.000000
k1 = 4.000000, k2 = 0.000000</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="greaterequal"><citetitle>>=</citetitle></link>,
<link linkend="greaterthan"><citetitle>></citetitle></link>,
<link linkend="lessequal"><citetitle><=</citetitle></link>,
<link linkend="lessthan"><citetitle><</citetitle></link>,
<link linkend="notequal"><citetitle>!=</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Example written by &namekevin;.</para>
</refsect1>
</refentry>
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