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</div><h1>C# <span class="color_h1">For Loop</span></h1>
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<hr>
<h2>C# For Loop</h2>
<p>When you know exactly how many times you want to loop through a block of
code, use the <code class="w3-codespan">for</code> loop instead of a <code class="w3-codespan">while</code> loop:</p>
<div class="w3-example">
<h3>Syntax</h3>
<pre class="language-csharp w3-white"><code>for (<i>statement 1</i>;<i> statement 2</i>;<i> statement 3</i>)
{
<i>// code block to be executed</i>
}
</code></pre>
</div>
<p><strong>Statement 1</strong> is executed (one time) before the execution of the code block.</p>
<p><strong>Statement 2</strong> defines the condition for executing the code block.</p>
<p><strong>Statement 3</strong> is executed (every time) after the code block has been executed.</p>
<p>The example below will print the numbers 0 to 4:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-csharp w3-white"><code>for (int i = 0; i < 5; i++)
{
Console.WriteLine(i);
}
</code></pre>
<p>
<a target="_blank" class="w3-btn" href="trycsed0c.html?filename=demo_for_loop">Try it Yourself »</a>
</p>
</div>
<h4>Example explained</h4>
<p>Statement 1 sets a variable before the loop starts (<code class="w3-codespan">int i = 0</code>).</p>
<p>Statement 2 defines the condition for the loop to run (<code class="w3-codespan">i</code> must be less than
<code class="w3-codespan">5</code>). If the condition is <code class="w3-codespan">true</code>, the loop will start over again, if it is <code class="w3-codespan">false</code>,
the loop will end.</p>
<p>Statement 3 increases a value (<code class="w3-codespan">i++</code>) each time the code block in the loop has
been executed.</p>
<hr>
<h2>Another Example</h2>
<p>This example will only print even values between 0 and 10:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-csharp w3-white"><code>for (int i = 0; i <= 10; i = i + 2)
{
Console.WriteLine(i);
}
</code></pre>
<p>
<a target="_blank" class="w3-btn" href="trycs232b.html?filename=demo_for_loop_even">Try it Yourself »</a>
</p>
</div>
<hr>
<h2>The foreach Loop</h2>
<p>There is also a <code class="w3-codespan">foreach</code> loop, which is used exclusively to loop through elements in an <strong>array</strong>:</p>
<div class="w3-example">
<h3>Syntax</h3>
<pre class="language-csharp w3-white"><code>foreach (<em>type</em> <em>variableName</em> in <em>arrayName</em>)
{
<i>// code block to be executed</i>
}
</code></pre>
</div>
<p>The following example outputs all elements in the <strong>cars</strong>
array, using a <code class="w3-codespan">foreach</code> loop:</p>
<div class="w3-example">
<h3>Example</h3>
<pre class="language-csharp w3-white"><code>string[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
foreach (string i in cars)
{
Console.WriteLine(i);
}
</code></pre>
<p>
<a target="_blank" class="w3-btn" href="trycs041d.html?filename=demo_array_for_each">Try it Yourself »</a>
</p>
</div>
<div class="w3-note w3-panel">
<p><strong>Note:</strong> Don't worry if you don't understand the example above. You will learn more about Arrays in the <a href="cs_arrays.html">C# Arrays chapter</a>.</p></div>
<hr>
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<h2>C# Exercises</h2>
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<h2>Exercise:</h2>
<p>Use a <code class="w3-codespan">for</code> loop to print "Yes" 5 times:</p>
<div class="exerciseprecontainer">
<pre style="overflow: auto;">
<input name="ex1" maxlength="3" style="width: 35px;"> (int i = 0; i < 5; <input name="ex2" maxlength="3" style="width: 35px;">)
{
Console.WriteLine("Yes");
}
</pre>
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