Concept explainers
Describe the difference between an instance member variable and a static member variable.
Explanation of Solution
Difference between instance member variable and static member variable:
Instance member variable | Static member variable |
In object-oriented programming, the data field in the class is known as instance data field or instance member variable. | In object-oriented programming, the member variable which is declared with the keyword “static” is called as static member variable. |
Every instance of the class has its individual copies of the class instance variables. | The keyword “static” means in memory there is only one copy of the static member variable is available. |
Without disturbing any other instances, one object instance can change the values of its instance variables. | If no initialization is present, all static variables are set to zero when the first object is created. |
In class, all the methods use the instance variables unless it is declared as a static. | The static member variables can be re-declared and reuse outside the class using the scope resolution operator (::). |
Example: Rectangle b1, b2; //set the width and length of the "b1" b1.setwidth (4); b1.setlength (1); //set the width and length of the "b2" b2.setwidth (50); b2.setlength (20); Here, “b1” and “b2” are the instance variables. |
Example: static int value; |
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