Constructors And Destructors In C Plus Plus — Part 1 MCQs with Explanations

In C++, the access specifier that allows constructors to be called only from member functions of the same class and its derived classes is private . When a constructor is declared as private , it cannot be accessed from outside the class, limiting its invocation to member functions of the same class and its derived classes. Option A: protected allows access to member functions and data members from within the same class, derived classes, and friend classes, but it still allows derived classes to call constructors, which might not be desired in some cases. Option B: public allows unrestricted access to the constructor from anywhere, defeating the purpose of restricting its usage to only member functions of the same class and its derived classes. Option D: friend allows non-member functions or external classes to access private and protected members of a class, but it doesn't restrict the calling of constructors to member functions of the same class and its derived classes. Therefore, the correct answer is Option C: private .

public is the correct answer to “Which access specifier allows constructors to be called from anywhere in the program in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A default constructor is provided by the compiler is the correct answer to “What happens if a class does not explicitly declare any constructors in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To prevent implicit conversions during object initialization is the correct answer to “What is the purpose of the 'explicit' keyword before a constructor in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

final is the correct answer to “Which keyword is used to prevent inheritance in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Shallow copy copies only the memory addresses of the objects, while deep copy copies the actual content is the correct answer to “What is the difference between a shallow copy and a deep copy in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A list of initializations for member variables is the correct answer to “What is a constructor initialization list in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

public is the correct answer to “What is the access specifier that allows members of a class to be accessed from anywhere in the program in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To prevent implicit conversions during object initialization is the correct answer to “What is the purpose of using the 'explicit' keyword in front of a constructor declaration in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Default constructor is the correct answer to “Which type of constructor is automatically called when an object is created without any arguments in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Destructors cannot have parameters is the correct answer to “Which of the following statements about destructors in C++ is true”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

It points to the memory location of the current object instance is the correct answer to “In C++, what is the purpose of the 'this' pointer in a class member function”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

final is the correct answer to “Which keyword is used to prevent a class from being inherited in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Shallow copy copies only the memory addresses of the objects, while deep copy copies the actual content is the correct answer to “In C++, what is the difference between a shallow copy and a deep copy”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructor is called automatically when an object is created, while a member function needs to be called explicitly is the correct answer to “What is the difference between a constructor and a normal member function in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A default constructor is automatically provided is the correct answer to “What happens if a class does not define any constructors in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To initialize class members before the body of the constructor executes is the correct answer to “What is the purpose of using constructor initialization lists in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

~className() is the correct answer to “What is the destructor called automatically when an object is destroyed in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

delete is the correct answer to “Which keyword is used to prevent an object from being copied in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

The compiler will throw an error is the correct answer to “What happens if a destructor is made private in a C++ class”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Default constructor is the correct answer to “In C++, which type of constructor is called when an object is created without any arguments”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To prevent implicit type conversions is the correct answer to “What is the primary purpose of the explicit keyword in a C++ constructor”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructors: Base to Derived, Destructors: Derived to Base is the correct answer to “In C++, what is the order of constructor and destructor calls for a class hierarchy”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

The object is not fully constructed is the correct answer to “What happens if a constructor throws an exception in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Destructor is the correct answer to “In C++, which function cannot be inherited but can be overridden in a derived class”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

They must be used for initializing all members of a class is the correct answer to “Which of the following statements about constructor initialization lists in C++ is correct”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructors cannot be overloaded is the correct answer to “Which of the following statements is true about constructors in C++”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To provide a default value for constructor arguments is the correct answer to “What is the purpose of using default arguments in C++ constructors”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructors are inherited with the same access specifier is the correct answer to “Which statement about constructor inheritance in C++ is correct”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Destructors cannot have any arguments is the correct answer to “Which statement about destructors in C++ is true”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

The destructor will not be called is the correct answer to “What happens if the destructor is explicitly defined in a C++ class, but the constructor is not defined”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

To prevent the destructor from being called is the correct answer to “What is the purpose of using the delete keyword in C++ destructors”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A's Constructor called B's Constructor called B's Destructor called A's Destructor called is the correct answer to “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{ 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; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

All of the mentioned is the correct answer to “How constructors are different from other member functions of the class”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

No chance for destructor overloading is the correct answer to “How destructor overloading is done”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Default constructor called Copy Constructor called Copy Constructor called is the correct answer to “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<<"Default constructor called\n"; } A(const A& a){ cout<<"Copy Constructor called\n"; } }; int main(int argc, char const *argv[]) { A obj; A a1 = obj; A a2(obj); }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

All of the mentioned is the correct answer to “When destructors are called”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

A's Constructor called B's Constructor called B's Destructor called A's Destructor called is the correct answer to “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{ public: B(){ cout<<"B's Constructor called\n"; } ~B(){ cout<<"B's Destructor called\n"; } }; int main(int argc, char const *argv[]) { B b1; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

Constructors allow function parameters whereas destructors do not is the correct answer to “What is the difference between constructors and destructors”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.

B's Constructor called B's Destructor called is the correct answer to “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{ static 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; }”. This question is standard in competitive examination syllabi for Constructors And Destructors In C Plus Plus.