Keywords in C

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Keywords in C

Keywords in C: A Primer for Programmers

Keywords are an integral part of any programming language. These reserved words play a crucial role in defining the syntax and structure of C programs. Understanding and using keywords correctly is essential for writing efficient and error-free code. In this blog post, we will learn about Keywords its uses and explore their significance.

What is Keyword in C?

The words which have pre-defined meaning in “C” language are called keywords. Since, they are reserved for specific purpose in “C” so, they are also known as “Reserved Word“.

Keywords are pre-defined identifiers with special meanings in the C programming language. They cannot be used as variable names or for any other purpose except their designated use within the language. Keywords are fundamental building blocks that form the syntax and grammar of C.

Keywords in C

Types of Keywords in C:

Keywords can be classified into three main categories, that are given below in details;

1. Primary Keywords:

These keywords represent fundamental concepts and actions in C. Some examples of primary keywords include int, float, char, if, else, for, while, do, switch, return, and sizeof. These keywords define data types, control structures, and program flow.

2. Data Types Keywords:

C provides a range of data types to represent various kinds of values. Keywords such as int, float, char, double, void, and enum are used to define different data types in C. These keywords help in allocating memory and performing operations on different data types.

3. Modifier Keywords:

Modifier keywords alter the behavior or characteristics of variables or functions in C. Examples of modifier keywords include const, extern, static, volatile, auto, register, and signed/unsigned. They provide additional information or constraints on how variables and functions should be treated.

Keywords in C

List of Keywords;

A list of 32 keywords in the C language is given below:

auto double int struct
break else long switch
case enum register typedef
char extern return union
const float short unsigned
continue for signed void
default goto sizeof while
do if staic volatile

Best Practices for Using Keywords:

To ensure smooth and error-free programming in C, it is important to follow certain best practices when it comes to keywords:

  • Use keywords as intended:

    Keywords are reserved for specific purposes, so avoid using them as variable names or any other identifiers in your code. This helps maintain code clarity and prevents conflicts or unexpected behavior.

  • Be aware of case sensitivity:

    C is a case-sensitive language, meaning that uppercase and lowercase letters are treated differently. Make sure to use keywords in the correct case as specified by the language. For example, while is a keyword, but While or WHILE are not.

  • Stay up-to-date:

    C evolves over time, and new keywords may be introduced in newer versions of the language. Stay informed about any updates or changes to the language specification to ensure your code remains compatible and follows best practices.


Keywords are the backbone of the C programming language. They provide a standardized vocabulary for expressing instructions, defining data types, and controlling program flow. By understanding and using keywords correctly, programmers can write efficient and reliable code. Remember to adhere to best practices, avoid using keywords as identifiers, and stay updated with the latest developments in the language. With a solid understanding of keywords, you’ll be well on your way to mastering the art of C programming.

So, in this blog post you have learned about Keywords in C language, its types, list, and uses. I hope you have learned this article welled. But if you have any doubt, you can ask in the comment section without any hesitation.

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