Technical Interview Questions and Answers :: Wipro
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A virtual function, equated to zero is called a pure virtual function. It is a function declared in a base class that has no definition relative to the base class. A class containing such pure function is called an abstract class.
It objectives are
• Provide some traits to the derived classes.
• To create a base pointer required for achieving run time polymorphism.
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Encapsulation is binding of attributes and behaviors. Hiding the actual implementation and exposing the functionality of any object. Encapsulation is the first step towards OOPS, is the procedure of covering up of data and functions into a single unit (called class). Its main aim is to protect the data from out side world.
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Structure- It is an user defined data function that allow to store multiple type of data in a single unit.
It occupies sum of memory of all location.
Whereas, Union- It is also an user defined data function that allow to store multiple type of data in a single unit.
But it occupies memory of largest member only.
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A database is a logically coherent collection of data with some inherent meaning, representing some aspect of real world and which is designed, built and populated with data for a specific purpose.