Comments in C Programming

C programming language comments; In this tutorial, i am going to show you how to use comments in the C language with syntax and examples.

How to write Comments in C Programming

A comment starts with a slash asterisk /* and ends with a asterisk slash */ and can be anywhere in your program. Comments can span several lines within your C program. Comments are typically added directly above the related C source code.

Attaching comments to your C source code is an extremely recommended practice. In common, it is forever better to over comment in C source code than to not add enough.

Syntax of C Programming Comments

The syntax for comment is:

/* comment goes here */

OR

/*
 * comment goes here
 */

Note that:- It is important that you prefer the way of commenting and use it consistently during your source code. Doing so creates the code more understandable.

Example 1 – Single Line Comment in C

You can create a comment on a single line. See the following example for that:

/* Author: Tutsmake.com */

C++ introduced a double slash comment prefix // as a way to comment single lines. The following is an example of this:

// Author: Tutsmake.com

This form of commenting may be used with most modern C compilers if they also understand the C++ language.

Example 2 – Multiple Lines Comment Spans in C

You can create a comment that spans multiple lines. See the following example for that:

/*
 * Author: tutsmake.com
 * Purpose: To show a comment that spans multiple lines.
 * Language:  C
 */

The compiler will assume that everything after the /* symbol is a comment until it reaches the */ symbol, even if it spans multiple lines within the C program.

Example 3 – End of Code Line Comment in C

You can create a comment that displays at the end of a line of code.

For example:

#define Amount 500    /* This constant is called Amount */

OR

#define Amount 500    // This constant is called Amount

In these examples, the compiler will define a constant called Amount that contains the value of 500. The comment is found at the end of the line of code after the constant has been defined.

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