Source Files, Classes and Operator Overloading in C++ Quiz 3

1 / 52

When a copy constructor is called?

When an object of the class is passed by value to a function

All of the mentioned

When an object is constructed based on another object of the same class

When an object of the class is returned by value

2 / 52

How destructor overloading is done?

By changing the number of parameters

By changing the parameters type

By changing both the number of parameters and their type

No chance for destructor overloading

3 / 52

How many types of constructors are there in C++?

4 / 52

Which method do we use to append more than one character at a time?

operator+=

both append & operator+=

data

append

5 / 52

How many Destructors are allowed in a Class?

Any number

6 / 52

Which is used to do the dereferencing?

value with asterix

pointer with asterix

value without asterix

pointer without asterix

7 / 52

Which header file is used to include the string object functions in C++?

#include <string.h>

#include <string>

#include <string.cpp>

#include <cstring>

8 / 52

What is the difference between constructors and destructors?

Constructors does not function parameters

Constructors allow function parameters whereas destructors do not

They have a different function name

Constructors does not have return type whereas destructors do have

9 / 52

What is string objects in C++?

A stream of characters terminated by

Stream of alphabets

A stream of well-defined characters

Stream of characters

10 / 52

What is the identifier given to string class to declare string objects?

String

Any of the above can be used

STRING

string

11 / 52

What is Character-Array?

array of well-defined characters

array of characters

array of alphabets

array of characters terminated by

12 / 52

Pick the incorrect statement about Character-Array.

Character-Array can be terminated by a null character(??)

Character-Array has a static size

Character-Array has a threat of array-decay

Character-Array has a dynamic size

13 / 52

Pick out the correct statement.

pre increment is slower than post-increment

post-increment is faster than Pre Increment

Pre Increment is faster than post-increment

pre decrement is slower than post-increment

14 / 52

Which of the following constructors are provided by the C++ compiler if not defined in a class?

Copy constructor

All of the mentioned

Assignment constructor

Default constructor

15 / 52

Which concepts does the Pre Increment use?

call by value

queue

call by name

call by reference

16 / 52

Which is used to tell the computer that where a pointer is pointing to?

binary operations

reference

dereference

heap operations

17 / 52

How many types are there in increment/decrement operator?

18 / 52

Pick out the correct statement.

Increment operator ++ adds 1 to its operand

Decrement operator ++ subtracts 3 to its operand

Increment operator ++ adds 2 to its operand

Decrement operator ++ subtracts 1 to its operand

19 / 52

Pick out the correct option.

References automatically dereference without needing an extra character

References automatically dereference with an extra character

Reference automatically dereference with extra space and character

Reference will not dereference

20 / 52

What do we need to use when we have multiple subscripts?

operator()

operator<>

operator[]

operator

21 / 52

How constructors are different from other member functions of the class?

All of the mentioned

Constructors do not return anything

Constructor has the same name as the class itself

Constructors are automatically called when an object is created

22 / 52

Which operator works only with integer variables?

decrement

binary operator

increment

both increment & decrement

23 / 52

What is a copy constructor?

A constructor that allows a user to move data from one object to another

A constructor to initialize an object with the values of another object

A constructor to kill other copies of a given object.

A constructor to check the whether to objects are equal or not

24 / 52

How many parameters does a default constructor require?

25 / 52

What is the use of function call operator?

overloading the parameters

overloading the string

overloading the objects

overloading the methods

26 / 52

Which of the following is correct?

Destructors can be virtual

There can be more than one destructor in a class

Destructor definition starts with !

Destructor is used to initialize objects

27 / 52

Pick out the correct statement.

the null pointer dereference occurs where a pointer that is expected to be a valid address but instead is equal to the memory address

null pointer will not return anything

rvalue equivalent to the value at the pointer address

the null pointer dereference occurs where a pointer that is expected to be a valid address but instead is equal to null

28 / 52

Which function is used to get the length of a string object?

str.length()

str.size()

both size() and length() function

str.max_size()

29 / 52

What is the use of functor?

It makes the attribute ?callable? like a function

It makes the class ?callable? like a function

It makes the argument ?callable? like a function

It makes the object ?callable? like a function

30 / 52

How many types of representation are in the string?

31 / 52

What is the role of a constructor in classes?

To destroy an object

To modify the data whenever required

To call private functions from the outer world

To initialize the data members of an object when it is created

32 / 52

In which form does the function call operator can be overloaded?

static member function

dynamis_cast

static_cast

non-static member function

33 / 52

Pick out the correct statement.

pre decrement is slower than post-increment

pre increment is slower than post-increment

Pre Increment is faster than post-increment

post-increment is faster than Pre Increment

34 / 52

What does the dereference operator will return?

rvalue equivalent to the value at the pointer address

it will return nothing

it will return boolean values

lvalue equivalent to the value at the pointer address

35 / 52

Pick out the correct statement.

Decrement operator ++ subtracts 3 to its operand

Increment operator ++ adds 2 to its operand

Decrement operator ++ subtracts 1 to its operand

Increment operator ++ adds 1 to its operand

36 / 52

Which of the following is not a modifier function in string class?

erase()

push_back()

operator[]()

operator+=()

37 / 52

What is the header file for the string class?

#include<str>

#include<stio>

#include<string>

#include<ios>

38 / 52

Which concepts does the Pre Increment use?

call by name

call by value

call by reference

queue

39 / 52

How many arguments will the subscript operator will take for overloading?

as many as possible

40 / 52

What will happen when the function call operator is overloaded?

It will modify the operator to be interpreted

It will not modify the functions

It will modify the functions

It will modify the object

41 / 52

What is syntax of defining a destructor of class A?

A(){}

A::A(){}

~A(){}

~A(){};

42 / 52

Pick the correct statement about string objects in C++.

String objects must be terminated by a null character(??)

String objects have a dynamic size

String objects have a static size

String objects use extra memory than required.

43 / 52

Which is used to return the number of characters in the string?

name

size

both size & length

length

44 / 52

How many types are there in increment/decrement operator?

45 / 52

What is the role of destructors in Classes?

To modify the data whenever required

To destroy an object when the lifetime of an object ends

To call private functions from the outer world

To initialize the data members of an object when it is created

46 / 52

What do we need to do to pointer for overloading the subscript operator?

store it in heap

memory locator

dereference pointer

reference pointer

47 / 52

Pick out the correct statement.

virtual functions does give the ability to write a templated function

virtual functions does not give the ability to rewrite a simple function

virtual functions does not give the ability to write a templated function

virtual functions does not give the ability to rewrite a templated function

48 / 52

Why constructors are efficient instead of a function init() defined by the user to initialize the data members of an object?

Because user may forget to call init() using that object leading segmentation fault

All of the mentioned

Because user may call init() more than once which leads to overwriting values

Because user may forget to define init() function

49 / 52

Pick out the correct statement.

subscript operator has a higher precedence than the assignment operator

subscript operator has a lower precedence than the assignment operator

subscript operator is used with char elements

subscript operator is used with string elements

50 / 52

When destructors are called?

When a function ends

When a delete operator is used

When a program ends

All of the mentioned

51 / 52

Which operator works only with integer variables?

binary operator

decrement

both increment & decrement

increment

52 / 52

What happens if a user forgets to define a constructor inside a class?

Compiler provides a default constructor to avoid faults/errors

Error occurs

Objects are not created properly

Segmentation fault

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