Inheritance in C++ MCQ question and answer with solution | C++ Programimg MCQs

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61.
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;
}

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63.
What is a virtual function in C++?

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64.
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;
}

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65.
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;
}

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66.
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;
}

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67.
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;
}

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70.
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;
}

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