C: Variables and Data Types in C- Sparsh Blog

VARIABLES AND DATA TYPES IN C

#VARIABLE:-

Variable is the name given to the storage area or memory location.

Example:-

1. int 🠊 used for storing Integer.
2. char 🠊 used for storing Character.

Declared by writing type variable _name;

Initialized and Declared by type variable _name = value;

Example:-

    1.    int a = 4;

    2.    int a;

           a = 4;

# RULES FOR DEFINING A VARIABLE IN C:-

1.    Can contain alphabets, digits, and underscore(_)

   

      Example:-   

•                          int sparsh;
•                          int _sparsh;

2.    A variable name can start with an alphabet & underscore only.

    Example:-

•        int 9sparsh;              🠊            Invalid
•         int long;                  🠊            Invalid    

        

    NOTE:-

        The above shown example is an invalid because a variable cannot start with the             number and it also cant take the name of any keyword.

3.    It can't start with the digit.

4.    No whitespace and Reserved keywordsd is allowed.

        Example:- 

•         int Sparsh Bhardwaj;                 🠊                 Invalid
•         int long;                                     🠊                 Invalid

SOME EXAMPLES OF THE VALID VARIABLE NAMES ARE:--

• int sparsh;
• float sparsh123;
• char_sparsh56;

SOME EXAMPLES OF THE INVALID VARIABLE NAMES ARE:--

• $sparsh;
• int 79sparsh;
• char long; 

#DATA TYPES:-

1.    Basic data types are:-

•         int;
•         char;
•         float;
•         double;
•         long;

2.     Derived data types are:-

•         Array
•         Pointer 
•         Structure
•         Union

        NOTE:-

                These are derived from the basic Data Types.    

3.     Enumeration Data type:-

•         enum;

4.     Void Data Type:-

•         void     

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