 always contain a valid <code>i32</code> value. But in contrast, the <code>ptr</code> object might contain either a null value, or, a pointer to an <code>i32</code> value.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb20"><pre class="sourceCode zig code-with-copy"><code class="sourceCode zig"><span id="cb20-1"><a href="#cb20-1" aria-hidden="true" tabindex="-1"></a><span class="kw">var</span> num: <span class="dt">i32</span> = <span class="dv">5</span>;</span>
<span id="cb20-2"><a href="#cb2