Learn C C Comments

Comments are used to explain the code and make it easier to understand. They are ignored by the compiler, which means they do not affect how the program runs.

Comments are very important in programming because they help you and others understand the logic of the code, especially in large projects.

Note

Comments are only for humans, not for the computer. The compiler completely ignores them during execution.

Single Line Comments

A single line comment starts with double forward slashes. It is used to write short explanations.

Explanation

The text after // is treated as a comment

It is used for quick notes or explanations

You can also place comments at the end of a line.

Pro Tip

Use single line comments for short and clear explanations of code.

Multi Line Comments

Multi line comments are used when you need to write longer explanations. They start with /* and end with */.

Explanation

Everything between /* and */ is treated as a comment

Useful for describing logic or sections of code

When to Use Comments

Comments should be used to improve readability and explain complex logic.

You can use comments to describe what a program does Explain difficult parts of code Add notes for future improvements

Real World Scenario

In real projects, developers use comments to explain functions and logic so that other team members can understand and maintain the code easily.

Good vs Bad Comments

Good Comment Example

Bad Comment Example

Explanation

Good comments explain why something is done

Bad comments repeat what is already obvious

Caution

Do not overuse comments. Writing too many unnecessary comments can make the code harder to read.

Commenting Out Code

Comments can also be used to temporarily disable code during testing.

Explanation

The commented line is ignored during execution

Useful for debugging

Goal Achieved

You now understand how to use comments in C to improve code readability and maintainability.

Exercise

Write a C program and add comments to explain each line of the code.