Use cases for referencing to a constant variable
<p>I understand the reference variable concept. It's an alias to the other variable.</p>

<pre><code>int varA = 100;
int &amp;varB = varA;  
</code></pre>

<p>Here <code>varB</code> is a referring to <code>varA</code>, both pointing to same memory location. Changes to one variable reflect in the other. </p>

<p>Question:</p>

<ol>
<li><p>a) <code>int &amp;c = 100;</code><br>
What is the meaning of the above statement, and how does it differ from the following?<br>
b) <code>int c = 100;</code><br></p></li>
<li><p>Is there any scenario where we need to use 1(a) rather than 1(b)?</p></li>
</ol>
