Define virtual class in C++

Define virtual class in C++

Virtual Base class:

Virtual base class is used in situation where a derived have multiple copies of base class.

program:

#include< iostream.h> #include< conio.h>
class ClassA
{
public:
int a;
};
class ClassB : virtual public ClassA
{
public:
int b;
};
class ClassC : virtual public ClassA
{
public:
int c;
};
class ClassD : public ClassB, public ClassC
{
public:
int d;
};
void main()
{
ClassD obj;
obj.a = 10;//Statement 1
obj.a = 100; //Statement 2
obj.b = 20;
obj.c = 30;
obj.d = 40;
cout<< "n A : "<< obj.a;
cout<< "n B : "<< obj.b;
cout<< "n C : "<< obj.c;
cout<< "n D : "<< obj.d;
}


output-

A : 100
B : 20
C : 30
D : 40




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