Pure virtual function:
A virtual function that does
not have its own body and defined as empty function is known as pure virtual
function.
virtual void function_name()=0;
A pure virtual function is a
function declared in a base class that has no definition. The compiler requires
derived class to either define the function or re-declare it.
A class containing pure
virtual function cannot be used to declare any object of its own class.
Abstract Class:
It acts as expression of general
concept from which more specific classes can be derived. We cannot create an
object of an abstract class type but we can use pointer and reference to
abstract class type.
A class that contains at
least one pure virtual function is called as abstract class. And classes derived
from an abstract class must implement the pure virtual function.
For ex:
class account
{
private:
int balance;
public:
void getBalance();
virtual void printBalance()=0;
}
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