WHAT IS VARIABLE?

                        Just like a container; that can help to store data with specific type.

    Example: int,char,string,

* In 'C' Language to declare a variable should maintain following point---------

➡️ 1st character should be an alpha or underscore(_).
              Ex: number,_number
➡️ Do not use any special character except under score(_)
           Ex:  student@name⛒
                    student+name⛒
                     student_name✓
➡️ May or may not sure numeric digits
            Ex: 1no⛒
                  _1no✓
                   no1✓
                   n1o✓
➡️ Upper case and lower char are distinct
         Ex:  no✓
                No✓
                NO✓
                nO✓

* How to declare a variable?
  syn: <datatype> <variable name>;

   Ex: int a;
          float b;
                                                                                                                                                                     Type of Variable:
1. int a; (signed short integer)
2. unsigned int b;  (unsigned short integer)
3. long c; (signed long integer)
4. unsigned long d; (unsigned long integer)
5. float p; (single precision real variable )
6. double r;(double precision real variable)
7. long double s;(double precision real variable)
8. char n;(character variable )
9. char name[30];(string variable)