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</div><h1>C# <span class="color_h1">Enum</span></h1>
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<hr>
<h2>C# Enums</h2>
<p>An <code class="w3-codespan">enum</code> is a special "class" that represents a group of
<strong>constants</strong> (unchangeable/read-only variables).</p>
<p>To create an <code class="w3-codespan">enum</code>, use the <code class="w3-codespan">enum</code> keyword (instead of class or interface), and separate
the enum items with a comma:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-csharp w3-white"><code>enum Level
{
Low,
Medium,
High
}
</code></pre>
<p>You can access <code class="w3-codespan">enum</code> items with the <strong>dot</strong> syntax:</p>
<pre class="language-csharp w3-white"><code>Level myVar = Level.Medium;
Console.WriteLine(myVar);</code></pre>
<a target="_blank" class="w3-btn w3-margin-bottom" href="trycscbf8.html?filename=demo_enums">Try it Yourself »</a>
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<div class="w3-note w3-panel">
<p>Enum is short for "enumerations", which means "specifically listed".</p>
</div>
<hr>
<h2>Enum inside a Class</h2>
<p>You can also have an <code class="w3-codespan">enum</code> inside a class:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-java w3-white"><code>class Program
{
enum Level
{
Low,
Medium,
High
}
static void Main(string[] args)
{
Level myVar = Level.Medium;
Console.WriteLine(myVar);
}
}</code></pre>
<p>The output will be:</p>
<div class="w3-padding notranslate w3-black w3-margin-top w3-margin-bottom">
<code>
Medium
</code>
</div>
<a target="_blank" class="w3-btn w3-margin-bottom" href="trycs12b9.html?filename=demo_enums_class">Try it Yourself »</a>
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<h2>Enum Values</h2>
<p>By default, the first item of an enum has the value 0. The second has the value 1, and so on.</p>
<p>To get the integer value from an item, you must <a href="cs_type_casting.html">explicitly convert</a> the item to an
<code class="w3-codespan">int</code>:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-java w3-white"><code>enum Months
{
January, // 0
February, // 1
March, // 2
April, // 3
May, // 4
June, // 5
July // 6
}
static void Main(string[] args)
{
int myNum = (int) Months.April;
Console.WriteLine(myNum);
}</code></pre>
<p>The output will be:</p>
<div class="w3-padding notranslate w3-black w3-margin-top w3-margin-bottom">
<code>
3
</code>
</div>
<a target="_blank" class="w3-btn w3-margin-bottom" href="trycs9356.html?filename=demo_enums_months">Try it Yourself »</a>
</div>
<p>You can also assign your own enum values, and the next items will update the number accordingly:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-java w3-white"><code>enum Months
{
January, // 0
February, // 1
March=6, // 6
April, // 7
May, // 8
June, // 9
July // 10
}
static void Main(string[] args)
{
int myNum = (int) Months.April;
Console.WriteLine(myNum);
}</code></pre>
<p>The output will be:</p>
<div class="w3-padding notranslate w3-black w3-margin-top w3-margin-bottom">
<code>
7
</code>
</div>
<a target="_blank" class="w3-btn w3-margin-bottom" href="trycsd23e.html?filename=demo_enums_months_assign">Try it Yourself »</a>
</div>
<hr>
<h2>Enum in a Switch Statement</h2>
<p>Enums are often used in <code class="w3-codespan">switch</code> statements to check for corresponding values:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-java w3-white"><code>enum Level
{
Low,
Medium,
High
}
static void Main(string[] args)
{
Level myVar = Level.Medium;
switch(myVar)
{
case Level.Low:
Console.WriteLine("Low level");
break;
case Level.Medium:
Console.WriteLine("Medium level");
break;
case Level.High:
Console.WriteLine("High level");
break;
}
}</code></pre>
<p>The output will be:</p>
<div class="w3-padding notranslate w3-black w3-margin-top w3-margin-bottom">
<code>
Medium level
</code>
</div>
<a target="_blank" class="w3-btn w3-margin-bottom" href="trycs57c1.html?filename=demo_enums_switch">Try it Yourself »</a>
</div>
<div class="w3-note w3-panel">
<h4>Why And When To Use Enums?</h4>
<p>Use enums when you have values that you know aren't going to change, like month days, days, colors, deck of cards, etc.</p></div>
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