Created: 2023-01-11 11:01
Status: #concept
Subject: Programming
Tags: C Expression Rvalue Macro Definition

Constant

A value that exists during compilation. It is typically used for Macro Definition and specific formulae.

C

We can assign constants to Variables or Macro Definitions:

int x = 3.14; // the constant number for PI

#define GRAVITY 9.8 // the Macro Definition for the Acceleration of Gravity

`const` Keyword

Similar to JavaScript, C has the const type qualifier which declares objects as "read-only" values.

const works on C Arrays, Pointer Variables, structs, and union types while Macro Definitions can't.

References