Variable things

Member variables of class Include Instance variables and Class variables （ Static variables ）, Member method Include Instance method and class method （ Static methods ）

Small mistakes ：

 Local variables defined in a method are created when the method is executed  ----> error 

int a;     --> Memory space will not be allocated

int a;a=5;   --> Will allocate memory space

Memory space is allocated only when a variable is assigned a value