Inheritance in C++
practice.

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class A
{
	int a;
   public: 
	A(){
		a = 0;
	}
	void show(){
		a++;
		cout<<"a: "<<a<<endl;
	}
};
 
class B: private A
{
   public:
 
};
 
int main(int argc, char const *argv[])
{
	B b;
	b.show();
	return 0;
}

What is Inheritance in C++?

What is a virtual function in C++?

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class A
{
	float d;
    public:
	int a;
	void change(int i){
		a = i;
	}
	void value_of_a(){
		cout<<a;
	}
};
 
class B: public A
{
	int a = 15;
    public:
	void print(){
		cout<<a;
	}
};
 
int main(int argc, char const *argv[])
{
	B b;
	b.change(10);
	b.print();
	b.value_of_a();
 
	return 0;
}

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class A
{
	float d;
   public:
	virtual void func(){
		cout<<"Hello this is class A\n";
	}
};
 
class B: public A
{
	int a = 15;
   public:
	void func(){
		cout<<"Hello this is class B\n";
	}
};
 
int main(int argc, char const *argv[])
{
	A *a = new A();
	B b;
	a = &b;
	a->func();
	return 0;
}

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class Mammal
{
   public:
	virtual void Define(){
		cout<<"I'm a Mammal\n";
	}
};
 
class Human: public Mammal
{
   private:
	void Define(){
		cout<<"I'm a Human\n";
	}
};
 
int main(int argc, char const *argv[])
{
	Mammal *M = new Mammal();
	Human H;
	M = &H;
	M->Define();
	return 0;
}

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class A{
	float d;
   public:
	virtual void func(){
		cout<<"Hello this is class A\n";
	}
};
 
class B: public A{
	int a = 15;
public:
	void func(){
		cout<<"Hello this is class B\n";
	}
};
 
int main(int argc, char const *argv[])
{
	B b;
	b.func();
	return 0;
}

Which concept of OOPs is shown by Virtual Functions?

Virtual functions in C++ tells the compiler to perform . . . . . . . . on such functions.

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class Mammal
{
   public:
	virtual void Define(){
		cout<<"I'm a Mammal\n";
	}
};
 
class Human: public Mammal
{
   public:
	void Define(){
		cout<<"I'm a Human\n";
	}
};
 
class Male: public Human
{
   public:
	void Define(){
		cout<<"I'm a Male\n";
	}
};
 
class Female: public Human
{
   public:
	void Define(){
		cout<<"I'm a Female\n";
	}
};
 
int main(int argc, char const *argv[])
{
	Mammal *M;
	Male m;
	Female f;
	*M = m;
	M->Define();
	return 0;
}

The concept of deciding which function to invoke during runtime is called . . . . . . . .

What is the order of Destructors call when the object of derived class B is declared, provided class B is derived from class A?

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class A
{
	int a, b;
	float d;
   public:
	void change(int i){
		a = i;
	}
	void value_of_a(){
		cout<<a;
	}
};
 
class B: private A
{
 
};
 
int main(int argc, char const *argv[])
{
	B b;
	cout<<sizeof(B);
	return 0;
}

What are the things are inherited from the base class?

What is the order of Constructors call when the object of derived class B is declared, provided class B is derived from class A?

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class polygon 
{
    protected:
    int width, height;
    public:
    void set_values (int a, int b)
    { 
        width = a; height = b;}
    };
    class output1 
    {
        public:
           void output (int i);
    };
void output1::output (int i) 
{
    cout << i << endl;
}
class rectangle: public polygon, public output1 
{
    public:
    int area ()
    { 
        return (width * height); 
    }
};
class triangle: public polygon, public output1 
{
    public:
    int area ()
    {
        return (width * height / 2); 
    }
};
int main () 
{
    rectangle rect;
    triangle trgl;
    rect.set_values (4, 5);
    trgl.set_values (4, 5);
    rect.output (rect.area());
    trgl.output (trgl.area());
    return 0;
}

Which symbol is used to create multiple inheritances?

How many specifiers are used to derive a class?

If a class is derived privately from a base class then . . . . . . . .

What is meant by multiple inheritance?