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<!DOCTYPE html>

<head>

content="C++ comments are hints that a programmer can add to make their code

easier to read and understand. They are completely ignored by C++

compilers. They are added with the purpose of making the source code

easier to read for the people who are from non-coding background." />

content="comments, comment comments in cpp, comments in c++, comment in cpp, comment in c++, what is a comment, what are comments, c++, cpp" />

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<h3 class="pb-3 pt-3">C++ Comments</h3>

<p>In this tutorial, we will learn about C++ comments, why we use them, and

how to use them with the help of examples.</p>

<p>C++ comments are hints that a programmer can add to make their code

easier to read and understand. They are completely ignored by C++

compilers. They are added with the purpose of making the source code

easier to read for the people who are from non-coding background.</p>

<p>There are two ways to add comments to code:</p>

<ol>

<li>

<code>//</code> - Single Line Comments </li>

<li><code>/* */</code> - Multi-line Comments

</li>

</ol>

<hr />

<h4 class="pt-3 pb-3">Single Line Comments</h4>

<p>In C++, any line that starts with <code>//</code> is a comment. For example,</p>

<pre>// declaring a variable

int x;

// initializing the variable 'x' with the value 5

x = 5;</pre>

<p>Here, we have used two single-line comments:</p>

<ul>

<li>

<code>// declaring a variable</code>

</li>

<li>

<code>// initializing the variable 'x' with the value 5</code>

</li>

</ul>

<p>We can also use single line comment like this:</p>

<pre>int x; // declaring a variable</pre>

<hr />

<h4 class="pt-3 pb-3">Multi-line comments</h4>

<p>In C++, any line between <code>/*</code> and <code>*/</code> is also a comment. For example,</p>

<pre>/* declaring a variable

to store salary to employees

int sal = 5000;</pre>

<p>This syntax can be used to write both single-line and multi-line comments.</p>

<hr />

<h5 class="pt-3 pb-3">Using Comments for Debugging</h5>

<p>Comments can also be used to disable code to prevent it from being

executed. For example,</p>

<pre>#include <iostream>

using namespace std;

int main() {

cout << "some code";

cout << ''error code;

cout << "some other code";

return 0;

}</pre>

<p>If we get an error while running the program, instead of removing the errorprone

code, we can use comments to disable it from being executed; this

can be a valuable debugging tool and save time to delete the wrong code

and to rewrite it.</p>

<pre>#include <iostream>

using namespace std;

int main() {

cout << "some code";

// cout << ''error code;

cout << "some other code";

return 0;

}</pre>

<p><strong>Pro tip: </strong>Remember the shortcut for using comments; it can be really

helpful. For most code editors, it's <code>Ctrl + /</code> for Windows and <code>Cmd + /</code> for

Mac.</p>

<h5 class="pt-3 pb-3">Why use Comments?</h5>

<p>If we write comments on our code, it will be easier for us to understand the

code in the future. Also, it will be easier for your fellow developers to

understand the code.</p>

<p><strong>Note: </strong>Comments shouldn't be the substitute for a way to explain poorly

written code in English. We should always write well-structured and selfexplanatory

code. And, then use comments.</p>

<p>As a general rule of thumb, use comments to explain Why you did

something rather than How you did something, and you are good.</p>

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