C Quick Syntax Reference

CHAPTER 17

Constants

A constant is a variable with a value that cannot be changed once it has been assigned. This allows the compiler to enforce that a variable’s value is not changed anywhere in the code by mistake.

Constant Variables

A variable can be made into a constant by adding the const keyword either before or after the data type. This modifier makes the variable read-only, and it must therefore be assigned a value at the same time as it is declared. Attempting to change the constant anywhere else results in a compile-time error.

const int var = 5;   /* recommended order */int const var2 = 10; /* alternative order */

Constant Pointers ...