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. One of the common ways to define constants in C is to use the #definepreprocessor directive, as shown below: In the above syntax: 1. is a placeholder for the name of the constant. 2. It's recommended that you name constants in the uppercase, as it helps differentiate them from other variables defined in the program. 3. is a placeh... const is scoped by C block, #define applies to a file (or more strictly, a compilation unit). const is most useful with parameter passing. If you see const used on a prototype with pointers, you know it is safe to pass your array or struct because the function will not alter it. No const and it can.
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