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OOP Interview Question:
What is pure virtual function in OOP?
Submitted by: AdministratorWhen you define only function prototype in a base class without and do the complete implementation in derived class. This base class is called abstract class and client won't able to instantiate an object using this base class.
A pure virtual function is a function that must be overridden in a derived class and need not be defined. A virtual function is declared to be "pure" using the curious "=0"
syntax:
class Base {
public:
void f1(); // not virtual
virtual void f2(); // virtual, not pure
virtual void f3() = 0; // pure virtual
};
Submitted by: Administrator
A pure virtual function is a function that must be overridden in a derived class and need not be defined. A virtual function is declared to be "pure" using the curious "=0"
syntax:
class Base {
public:
void f1(); // not virtual
virtual void f2(); // virtual, not pure
virtual void f3() = 0; // pure virtual
};
Submitted by: Administrator
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