Constants in C const vs define
Learn how to use constants in C programming on Debian 12. This tutorial covers both const keyword and #define preprocessor with practical examples. Understanding Constants in C Programming Constants in C are fixed values that cannot be altered during program execution. Using constants makes your code more readable and maintainable. In C, there are two main ways to define constants: using the const keyword and the #define preprocessor directive. The const Keyword The const keyword creates a read-only variable. Once initialized, its value cannot be changed. The syntax is: const type name = value; For example: const float PI = 3.14159; const int MAX_USERS = 100; Key characteristics: Has data type and scope rules like normal variables Allocated storage in memory Can be used for array sizes in C99 and later The #define Preprocessor #define creates macro constants th...