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      <title>Operators</title>
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   <body>
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      <hr>
      <h3><a name="sec10.4">10.4 Operators</a></h3>
      <p>The operators are pretty much the same as in the C language.
         The common ones are:
         
         <dl>
            <dt><strong>Arithmetic</strong></dt>
            <dd>
               
               <dl>
                  <dt><strong><code>+</code> (add)</strong></dt>
                  <dt><strong><code>-</code> (subtract)</strong></dt>
                  <dt><strong><code>*</code> (multiply)</strong></dt>
                  <dt><strong><code>/</code> (divide)</strong></dt>
                  <dt><strong><code>%</code> (modulus)</strong></dt>
               </dl>
               
            </dd>
            <dt><strong>Boolean</strong></dt>
            <dd>
               
               <dl>
                  <dt><strong><code>!</code> (not)</strong></dt>
                  <dt><strong><code>&amp;&amp;</code> (and)</strong></dt>
                  <dt><strong><code>||</code> (or)</strong></dt>
                  <dt><strong><code>^</code> (exclusive-or)</strong></dt>
                  <dt><strong><code>==</code> (numeric identity)</strong></dt>
                  <dt><strong><code>!=</code> (numeric non-identity)</strong></dt>
                  <dt><strong><code>&lt;</code> (less than)</strong></dt>
                  <dt><strong><code>&gt;</code> (greater than)</strong></dt>
                  <dt><strong><code>&lt;=</code> (less than or equal)</strong></dt>
                  <dt><strong><code>&gt;=</code> (greater than or equal)</strong></dt>
               </dl>
               
            </dd>
            <dt><strong>Bitwise</strong></dt>
            <dd>
               
               <dl>
                  <dt><strong><code>&amp;</code> (and)</strong></dt>
                  <dt><strong><code>|</code> (or)</strong></dt>
                  <dt><strong><code>^</code> (exclusive-or)</strong></dt>
                  <dt><strong><code>&lt;&lt;</code> (left shift)</strong></dt>
                  <dt><strong><code>&gt;&gt;</code> (right shift)</strong></dt>
                  <dt><strong><code>&gt;&gt;&gt;</code> (logical right shift)</strong></dt>
               </dl>
               
            </dd>
            <dt><strong>Numeric Typecasts</strong></dt>
            <dd>
               
               <dl>
                  <dt><strong><code>(byte)</code>   (numeric -&gt; signed byte)</strong></dt>
                  <dt><strong><code>(short)</code>  (numeric -&gt; 2-byte integer)</strong></dt>
                  <dt><strong><code>(int)</code>    (numeric -&gt; 4-byte integer)</strong></dt>
                  <dt><strong><code>(long)</code>   (numeric -&gt; 8-byte integer)</strong></dt>
                  <dt><strong><code>(float)</code>  (numeric -&gt; 4-type floating point)</strong></dt>
                  <dt><strong><code>(double)</code> (numeric -&gt; 8-byte floating point)</strong></dt>
               </dl>
               Note you may find the 
               <a href="uk.ac.starlink.ttools.func.Maths.html">Maths</a> 
               conversion functions more convenient for numeric conversions than these.
               
            </dd>
            <dt><strong>Other</strong></dt>
            <dd>
               
               <dl>
                  <dt><strong><code>+</code>  (string concatenation)</strong></dt>
                  <dt><strong><code>[]</code> (array dereferencing - first element is zero)</strong></dt>
                  <dt><strong><code>?:</code> (conditional switch)</strong></dt>
                  <dt><strong><code>instanceof</code> (class membership)</strong></dt>
               </dl>
               
            </dd>
         </dl>
         
      </p>
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       <b>Up: </b><a href="jel.html">Algebraic Expression Syntax</a><br>
       <b>Previous: </b><a href="sec10.3.html">Null Values</a><br>
      
      <hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
         <a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
         <a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
         <a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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