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# How to Comment Out a Multiple-Line Portion of a LaTeX Source File? Comment Block Explained

When you’re working on a LaTeX source file, there may be times when you need to comment out a multiple-line portion of the code temporarily. This can be done using the comment block command. We’ll explain the comment block command in this post and show you how to use it.

One of the biggest problems I’ve faced working with LaTeX is that I can’t figure out how to comment on multiple lines within a given source file. I know how to create a comment block and insert it into the source file, but can I comment out (or “uncomment”) a block of code that was already written. This blog is my attempt to explain, in great detail:

## What is a comment block?

A comment block is a section of text that is set apart from the main body and is ignored by the compiler. In LaTeX, a comment block is delimited by /* and */. The compiler will ignore anything between these two symbols. This can be useful for commenting on a multiple-line section of your source file or adding explanatory notes to your code.

A comment block is a group of lines preceded by a % symbol and having a comment indicator in the first column, which are treated as a comment. The comment indicator is a sequence of characters, where each character is not a space, tab, or newline. The purpose of a comment block is to enable the comment to be indented to put it in the same block as the code it is commenting on.

## How to comment out a multiple-line portion of a LaTeX source file

If you’re having trouble commenting out a multiple-line section of a LaTeX source file, here are a quick example. Assume you have a source file named A.

### tex and you want to comment out the following lines:

Line 1: \documentclass{article}

Line 2: \usepackage{fontspec}

Line 3: \setmainfont{Ubuntu}

Line 4: \begin{document}

Line 5: \end{document}

Commenting out a multiple-line portion of a LaTeX source file is easy. All you need is the comment symbol, which is a hash mark or octothorpe; The comment will be ignored by LaTeX and will not appear in your output file. To uncomment a statement, remove the hash mark at the beginning of the line.

## Why use a comment block?

When I was beginning with LaTeX, I was looking for a way to comment on a section of code in my source file. With the help of LaTeX’s comment block, it thus turned out to have been a simple task.

The comment block is defined as follows

% This is the comment block for the code. The % starts the comment block. Anything between % and % is a comment and won’t be compiled into the document. This is a text for my comment block. The % ends the comment block.

Comment blocks are an essential part of LaTeX—they allow you to temporarily ignore large portions of your source code while working on specific aspects. This seems to be particularly important when attempting to troubleshoot a problem. It lets you focus on one particular section without being distracted by the rest of the file. You can also use comment blocks to create commented-out versions of your code, which can be useful for testing or troubleshooting.

## How to format a comment block

To format a comment block in LaTeX, you need to use the \comment{} command. This will tell LaTeX to start a comment block and ignore anything inside it. Everything that’s between the \comment{} and the closing brace } will be treated as a comment and won’t be included in your final document. You can also use the \endcomment{} command to end a comment block.