Constants Variables and Keywords in c Language

Alphabets, Numbers are Special Symbols are Combined to from Constants, Variables and Keywords 

Constants

A Constant is an entity that doesn't change. 

Types Of Constants: 

• 1.Integer Constant
• 2.Real Constant
• 3.Character Constant

Integer Constant : The integer Constants are contain  " Number Only ".    

Ex: 25, 55, 65.

Real Constant: The Real Constants are Contain " Real Number are float Number ".

Ex: 25.52, 0.05,0.25.

Character Constant: The Character Constants are Contains " Character Constants  (or) alphabets " .

Ex: 'a', 'A', 'z'.

Variables

1. An Variable is an entity that does change.
2. In Programming Language The Variable Used to Store the Data ( Value ).

Ex:   int  x = 10;

Here, x is Variable , 10 is integer.

Keywords

1. By Using Keywords We Can Constant The Meaning Full Statements.
2. Here, The Some Keywords Already Using The C Compiler.

Ex:  break, for, if, int, float, char, ......

3. Keywords Can't be Used as Variable names.


Conclusion

Type                                                  Keyword                                        Example

Integer                                                 int                                           int a;      int age;

Real  (or) floating Point                       float                                        float x;    float average;  

Character                                           char                                         char s;     char  initial;