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: A constant in C is a user-assigned name to a location in the memory, whose value cannot be modified once declared. This is in contrast to a variable in C, which is also a named memory location, however whose value may be changed during the course of the code.
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