e are creating a variable object named <code>num</code>, and an optional pointer object named <code>ptr</code>. Notice that the data type of the object <code>ptr</code> indicates that it’s either a null value, or a pointer to an <code>i32</code> value. Also, notice that the pointer object (<code>ptr</code>) can be marked as optional, even if the object <code>num</code> is not optional.</p>
<p>What this code tells us is that, the <code>num</code> variable will never contain a null value. This variable will