Data Types

Datatype defines the type of value which we store in the variable. 

They are a means to define the type of data and associated operation of handling it.

There are 3 major data types:

Fundamental Datatype :

The datatypes which are not composed of other datatype are called as fundamental datatypes.

Example:

• Integer
• Character
• Floating Point
• Double Floating Point
• Boolean
• Void
  

Derived Datatype

The datatypes derived from the fundamental datatypes are called as derived datatypes.

Example:

• Function
• Array
• Pointer
• Reference

User-defined Datatype

These are defined by the user itself.

Example:

• Class
• Structure
• Union
• Enumeration
• Typedef

enum (enumeration)

Enumerated means that all values are listed.

Example : 

Instead of writing 3 integer constants separately like :

const int START = 0;

const int PAUSE = 1;

const int GO = 2;

We can write :

enum { START, PAUSE, GO} ;

enum week_days { sun, mon, tue, wed, thur, fri, sat } ;

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