I want to write codes in proper format in a blog as Sample here
How it can be done? Is there any plugin that I need to install?
You can use the "Plugin" from Google called code pretiffier. First of all import the following script into your website:
<script src="https://cdn.jsdelivr.net/gh/google/code-prettify@master/loader/run_prettify.js"></script>
After you imported this, you can write the wished code into a pre tag with the class "prettyprint". It should look like this:
<pre class="prettyprint">
//Your custom code
</pre>