Instance Variable Vs Static Variable
- Each object will have its own copy of the instance variable whereas We can only have one copy of a static variable per class irrespective of how many objects we create.
- Changes made in an instance variable using one object will not be reflected in other objects as each object has its own copy of the instance variable. In the case of static, changes will be reflected in other objects as static variables are common to all objects of a class.
- We can access instance variables through object references and Static Variables can be accessed directly using the class name.
- The syntax for static and instance variables:
class Example
{
static int a; // static variable
int b; // instance variable
}
C++ Variables
Variables in C++ is a name given to a memory location. It is the basic unit of storage in a program.
- The value stored in a variable can be changed during program execution.
- A variable is only a name given to a memory location, all the operations done on the variable effects that memory location.
- In C++, all the variables must be declared before use.