Programming with CPP
 

  1. Question: Which of the following statements about constructors and destructors are true?

    A
    In a given class, constructors are always required to be defined, but destructors are not

    B
    Neither constructors nor destructors can take parameters

    C
    Constructors can take parameters, but destructors cannot

    D
    It is illegal to define a destructor as virtual

    E
    It is illegal to define a constructor as virtual

    F
    Both explicitly declared constructors and explicitly declared destructors are required in a class

    Note: Not available
    1. Report

  2. Question: Consider the sample code given below and answer the question that follows.
    class X {
  int   i;

protected:
  float f;

public:
  char  c;
};

class Y : private X { };
    Referring to the sample code above, which of the following data members of X are accessible from class Y

    A
    c

    B
    f

    C
    i

    D
    none

    Note: Not available
    1. Report

  3. Question: Consider the following code:
    class Animal
{
private:
    int weight;

public:
    Animal()
    {
    }

    virtual void Speak()
    {
        cout << "Animal speaking";
    }
};

class Snake : public Animal
{
private:
    int length;

public:
    Snake()
    {
    }

    void Speak()
    {
        cout << "Snake speakingrn";
    }
};

int main()
{
    Animal *array = new Snake[10];

    for (int index= 0; index < 10; index++)
    {
        array->Speak();
        array++;
    }
    
    return 0;
}
    What happens when the above code is compiled and executed?

    A
    The code will generate compilation errors

    B
    The code will compile and run fine. "Animal speaking" will be printed to the output

    C
    The code will compile and run fine. "Snake speaking" will be printed to the output

    D
    The code will crash at runtime

    Note: Not available
    1. Report

  4. Question: Consider the sample code given below and answer the question that follows.
    class A
{
public:
A() {}
~A()
{
cout << "in destructor" << endl;
}
};
void main()
{
A a;
a.~A();
}
    How many times will "in destructor" be output when the above code is compiled and executed?

    A
    0

    B
    1

    C
    2

    D
    A compile time error will be generated because destructors cannot be called directly

    Note: Not available
    1. Report

  5. Question: Consider the sample code given below and answer the question that follows.
    class Outer
{
  public:
    class Inner
      {
        int Count;
        public:
        Inner(){};
      };
};
int main()
  {
Inner innerObject;
Outer outObject;
return 0;
  }
    What will be the result when the above code is compiled?

    A
    The code will compile fine

    B
    There will be errors because classes cannot be defined inside other classes

    C
    There will be an error because Outer does not define a constructor

    D
    There will be an error because in the declaration of innerObject the type Inner must be qualified by Outer

    E
    There will be no errors but a warning that Inner and Outer do not have destructors

    Note: Not available
    1. Report

  6. Question: Consider the sample code given below and answer the question that follows.
    1 class Car
2 {
3 private:
4 int Wheels;
5
6 public:
7 Car(int wheels = 0)
8 : Wheels(wheels)
9 {
10 }
11
12 int GetWheels()
13 {
14 return Wheels;
15 }
16 };
17 main()
18 {
19 Car c(4);
20 cout << "No of wheels:" << c.GetWheels();
21 }
    Which of the following lines from the sample code above are examples of data member definition?

    A
    4

    B
    7

    C
    8

    D
    14

    E
    19

    Note: Not available
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  7. Question: Consider the following statements relating to static member functions and choose the appropriate options: 1. They have external linkage 2. They do not have 'this' pointers 3. They can be declared as virtual 4. They can have the same name as a non-static function that has the same argument types

    A
    All are true

    B
    Only 1, 2 and 4 are true

    C
    Only 1 and 2 are true

    D
    Only 1,3 and 4 are true

    E
    All are false

    Note: Not available
    1. Report

  8. Question: What access specifier allows only the class or a derived class to access a data member

    A
    private

    B
    protected

    C
    default

    D
    virtual

    E
    public

    Note: Not available
    1. Report

  9. Question: Consider the line of code given below and answer the question that follows.
    class screen;
    Which of the following statements are true about the class declaration above?

    A
    Incorrect syntax. The body of the class declaration is missing

    B
    Incorrect syntax. {}; is missing

    C
    The syntax is correct

    D
    Incorrect syntax. {} is missing

    E
    Incorrect syntax. Requires a *

    Note: Not available
    1. Report

  10. Question: What will be the output of the following code?
    class b
{
    int i;
    public:
    virtual void vfoo()
  {
    cout <<"Base ";
  }
};
class d1 : public b
{
    int j;
    public:
    void vfoo()
  {
    j++;
    cout <<"Derived";
  }
};
class d2 : public d1
{
    int k;
};
void main()
{
    b *p, ob;
    d2 ob2;
    p = &ob;
    p->vfoo();
    p = &ob2;
    p->vfoo();
}

    A
    Base Base

    B
    Base Derived

    C
    Derived Base

    D
    Derived Derived

    Note: Not available
    1. Report
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