Web Reference: Nov 1, 2025 · In C programming, const is a keyword used to declare a variable as constant, meaning its value cannot be changed after it is initialized. It is mainly used to protect variables from being accidentally modified, making the program safer and easier to understand. Now that you have seen different types of variables in C, you should also know that sometimes you need variables that should not change. This can be done with the const keyword, which makes a variable unchangeable and read-only: This blog post will delve deep into the fundamental concepts of `const` in C, explore its various usage methods, highlight common practices, and discuss best practices to help you master this important feature.
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