C++ Programming Multiple Choice Questions - Constructor And Destructor

This section focuses on the "Constructor And Destructor" in C++ programming langauge. These Multiple Choice Questions (MCQ) should be practiced to improve the C++ programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. Which of the followings is/are automatically added to every class, if we do not write our own.

A. Copy Constructor.
B. Assignment Operator
C. A constructor without any parameter
D. All of the above

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2. Which of the following gets called when an object is being created?

A. Constuctor
B. Virtual Function
C. Destructors
D. Main

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3. Destructor has a same name as the constructor and it is preceded by?

A. !
B. ?
C. ~
D. $

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4. Like constructors, can there be more than one destructors in a class?

A. Yes
B. No
C. May Be
D. Can't Say

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5. State whether the following statements about the constructor are True or False. i) constructors should be declared in the private section. ii) constructors are invoked automatically when the objects are created.

A. True,True
B. True,False
C. False,True
D. False,False

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6. Which of the following is true about constructors. i) They cannot be virtual ii) They cannot be private. iii) They are automatically called by new operator.

A. All i,ii,iii
B. i & iii
C. ii & iii
D. i & ii

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7. Destructors __________ for automatic objects if the program terminates with a call to function exit or function abort

A. Are called
B. Are not called
C. Are inherited
D. Are created

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8. Which contructor function is designed to copy object of same class type?

A. Copy constructor
B. Create constructor
C. Object constructor
D. Dynamic constructor

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9. What will be the output of the following program?

#include <iostream>
using namespace std;

class LFC
{
    int id;
    static int count;
public:
    LFC() {
        count++;
        id = count;
        cout << "constructor for id " << id << endl;
    }
    ~LFC() {
        cout << "destructor for id " << id << endl;
    }
};

int LFC::count = 0;

int main() {
    LFC a[3];
    return 0;
}  

A. constructor for id 1 constructor for id 2 constructor for id 3 destructor for id 3 destructor for id 2 destructor for id 1
B. constructor for id 1 constructor for id 2 constructor for id 3 destructor for id 1 destructor for id 2 destructor for id 3
C. Compiler Dependent
D. constructor for id 1
destructor for id 1

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10. What will be the output of the following program?

#include <iostream>
using namespace std;
class LFC {
    LFC() { cout << "Constructor called"; }
};

int main()
{
   LFC t1;
   return 0;
}

A. Compiler Error
B. Runtime Error
C. Constructor called
D. destructor for id 1

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