0
This is a **line** of code. 

How can I make line and only line shown in bold font?

6

You can't and there is really no need to. If you want to "highlight" something in your code, point it out in a code comment.

3

This cannot be done using markdown. Your only option is to resort to literal HTML:

<pre><code>This is a <strong>line</strong> of code.</code></pre>

Which renders as:

This is a line of code.

But this is ugly and hackish, and mostly unnecessary. Do like Bart said and use a comment to call out important things in your code samples instead.

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