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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>enum</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">C/C++ Keywords</a> &gt; <a href="enum.html">enum</a>  </div>  <div class="name-format">    enum  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  enum name {name-list} var-list;</pre>  <p>The enum keyword is used to create an enumerated type named name  that consists of the elements in <em>name-list</em>. The  <em>var-list</em> argument is optional, and can be used to create  instances of the type along with the declaration.  For example, the  following code creates an enumerated type for colors:</p>  <div class="related-examples">    <pre class="example-code">   enum ColorT {red, orange, yellow, green, blue, indigo, violet};   ...   ColorT c1 = indigo;   if( c1 == indigo ) {     cout &lt;&lt; &quot;c1 is indigo&quot; &lt;&lt; endl;   }            </pre></div>  <p>In the above example, the effect of the enumeration is to  introduce several new constants named <em>red</em>, <em>orange</em>,  <em>yellow</em>, etc.  By default, these constants are assigned  consecutive integer values starting at zero.  You can change the  values of those constants, as shown by the next example:</p>  <div class="related-examples">    <pre class="example-code">   enum ColorT { red = 10, blue = 15, green };   ...   ColorT c = green;   cout << "c is " << c << endl;</pre></div>  <p>When executed, the above code will display the following  output:</p>  <div class="related-examples">    <pre class="example-code">   c is 16</pre></div>  <p>Note that the above examples will only work with C++ compilers.  If you're working in regular C, you will need to specify the  <em>enum</em> keyword whenever you create an instance of an  enumerated type:  <div class="related-examples">    <pre class="example-code">   enum ColorT { red = 10, blue = 15, green };   ...   enum ColorT c = green;   // note the aditional enum keyword   printf( "c is %d\n", c );</pre></div>  </td>    </tr>  </table></body></html>
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