C++ 14 Quick Syntax Reference, Second Edition

CHAPTER 23

Constants

A constant is a variable that has a value which cannot be changed once the constant has been assigned. This allows the compiler to enforce that the 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 means that the variable becomes read-only, and it must therefore be assigned a value at the same time as it is declared. Attempting to change the value anywhere else results in a compile-time error.

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

Constant Pointers