C++ Quick Syntax Reference

CHAPTER 23

Constants

A constant is a variable that has a value which cannot be changed once the constant has been assigned.

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 will result in a compile-time error.

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

Constant pointers

When it comes to pointers, const can be used in two ways. First, the pointer can be made constant, which means that it ...