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

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71.
What will be the output of the following C++ code?
#include <iostream>  
using namespace std;
class A{
public:
	int a;
};
int main(int argc, char const *argv[])
{
	A a1 = {10};
	A a2 = a1;
	cout<<a1.a<<a2.a;
	return 0;
}

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72.
What will be the output of the following C++ code?
#include <iostream>  
using namespace std;
class A{
public:
	int a;
	A(){
		cout<<"Constructor called\n";
	}
} a;
int main(int argc, char const *argv[])
{
	cout<<"Main function\n";
	return 0;
}

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73.
What will be the output of the following C++ code?
#include <iostream>
#include <string>
using namespace std;
class A{
	int a;
	A(){
		a = 5;
	}
 
public:
	void assign(int i){
		a = i;
	}
	int return_value(){
		return a;
	}
};
int main(int argc, char const *argv[])
{
	A obj;
	obj.assign(10);
	cout<<obj.return_value();
}

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74.
What will be the output of the following C++ code?
#include <iostream>
#include <string>
using namespace std;
class A{
	mutable int a;
public:
	A(){
		cout<<"A's Constructor called\n";
	}
	~A(){
		cout<<"A's Destructor called\n";
	}
};
class B: public A{
	A a;
public:
	B(){
		cout<<"B's Constructor called\n";
	}
	~B(){
		cout<<"B's Destructor called\n";
	}
};
int main(int argc, char const *argv[])
{
	B b1;
}

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75.
What will be the output of the following C++ code?
#include <iostream>  
using namespace std;
class A{
	A(){
		cout<<"A's Constructor called\n";
	}
	friend class B;
};
class B
{
public:
	A a;
	B(){
		cout<"B's constructor called\ns";
	}
};
int main(int argc, char const *argv[])
{
	B b;
	return 0;
}

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76.
What is the role of a constructor in classes?

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