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    <p>Take a look at this code:</p> <pre><code>showMovieData(apocalypseNow) &lt;&lt; endl; showMovieData(theWizardOfOz) &lt;&lt; endl; </code></pre> <p>Here, <code>showMovieData</code> is a function that returns <code>void</code>, meaning that it doesn't evaluate to a value. The code you've written is then trying to apply <code>operator &lt;&lt;</code> to a nonexistent value and <code>endl</code>, which is impossible because you can't apply any operators to a <code>void</code> value.</p> <p>To fix this, consider rewriting the code as</p> <pre><code> showMovieData(apocalypseNow); cout &lt;&lt; endl; showMovieData(theWizardOfOz); cout &lt;&lt; endl; </code></pre> <p>Alternatively, replace <code>showMovieData</code> with a global <code>operator&lt;&lt;</code> operator that can be used to display objects of type <code>MovieData</code>, like this:</p> <pre><code>ostream&amp; operator&lt;&lt;(ostream&amp; out, const MovieData&amp; movie) { out &lt;&lt; "Title: " &lt;&lt; movie.title &lt;&lt; endl; out &lt;&lt; "Director: " &lt;&lt; movie.director &lt;&lt; endl; out &lt;&lt; "Year Released: " &lt;&lt; movie.yearReleased &lt;&lt; endl; out &lt;&lt; "Running Time (in minutes): " &lt;&lt; movie.runningTimeInMinutes &lt;&lt; endl; return out; } </code></pre> <p>Then, you can write</p> <pre><code>cout &lt;&lt; apocalypseNow &lt;&lt; endl; cout &lt;&lt; theWizardOfOz &lt;&lt; endl; </code></pre> <p>That said, the <code>operator&lt;&lt;</code> definition above isn't ideal because it inserts <code>endl</code> into the stream, flushing the contents, but it should also work. You may want to consider to replace <code>endl</code> inside <code>operator&lt;&lt;(ostream&amp;, const MovieData&amp;)</code> with <code>'\n'</code> which avoids the flushing.</p> <p>Hope this helps!</p>
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