(b) Briefly explain two categories of constants in C.

 Two Categories of Constants in C   

Primary Constants

These are the basic constants we use directly in a C program.

Types of Primary Constants:

• Integer Constant → Example: 5, -10, 100

• Float Constant → Example: 3.14, -2.5

• Character Constant → Example: 'A', 'z', '9'

• String Constant → Example: "Hello", "C programming"

Used for storing direct values in variables like:

c
int a = 10;     // 10 is an integer constant 

char ch = 'A'; // 'A' is a character constant 

Secondary Constants

These are user-defined or derived constants.

Types of Secondary Constants:

• Symbolic Constants → Created using #define
Example: #define PI 3.14

• Enumerations (enum) → Set of named integer constants
   Example:

  c
  enum day { SUN, MON, TUE };

In Simple Words:

Category	What it is	Example
Primary	Basic constant values	10, 'A', "C"
Secondary	Defined by the user/programmer	#define, enum