0 What are constants in C?

A constant is an entity whose value doesn’t change during program execution.

Types of C Constants
C constants can be divided into two major categories:
   (1). Primary Constants
          a. Integer Constants

          b. Real or Floating Constants

          c. Character Constants

   (2)Secondary Constants

         a.Array

         b.Pointer

         c.Structure

         d.Union

         e.Enum. etc