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

1 / 52

How many types of representation are in the string?

2 / 52

What is a copy constructor?

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

A constructor to kill other copies of a given object.

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

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

3 / 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

4 / 52

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

dereference pointer

memory locator

store it in heap

reference pointer

5 / 52

What is Character-Array?

array of alphabets

array of characters terminated by

array of well-defined characters

array of characters

6 / 52

Pick out the correct statement.

Pre Increment is faster than post-increment

post-increment is faster than Pre Increment

pre decrement is slower than post-increment

pre increment is slower than post-increment

7 / 52

What is the difference between constructors and destructors?

Constructors allow function parameters whereas destructors do not

Constructors does not have return type whereas destructors do have

They have a different function name

Constructors does not function parameters

8 / 52

What is string objects in C++?

A stream of characters terminated by

Stream of characters

Stream of alphabets

A stream of well-defined characters

9 / 52

When a copy constructor is called?

When an object of the class is returned by value

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

All of the mentioned

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

10 / 52

Which concepts does the Pre Increment use?

call by reference

call by value

call by name

queue

11 / 52

Pick the incorrect statement about Character-Array.

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

Character-Array has a dynamic size

Character-Array has a threat of array-decay

Character-Array has a static size

12 / 52

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

String objects have a dynamic size

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

String objects have a static size

String objects use extra memory than required.

13 / 52

Pick out the correct option.

Reference automatically dereference with extra space and character

References automatically dereference without needing an extra character

References automatically dereference with an extra character

Reference will not dereference

14 / 52

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

operator

operator[]

operator<>

operator()

15 / 52

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

push_back()

erase()

operator+=()

operator[]()

16 / 52

How destructor overloading is done?

No chance for destructor overloading

By changing the parameters type

By changing both the number of parameters and their type

By changing the number of parameters

17 / 52

Which is used to do the dereferencing?

pointer with asterix

pointer without asterix

value with asterix

value without asterix

18 / 52

How many types are there in increment/decrement operator?

19 / 52

What is the header file for the string class?

#include<string>

#include<ios>

#include<str>

#include<stio>

20 / 52

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

Copy constructor

Default constructor

Assignment constructor

All of the mentioned

21 / 52

When destructors are called?

When a function ends

When a program ends

When a delete operator is used

All of the mentioned

22 / 52

Pick out the correct statement.

subscript operator has a higher precedence than the assignment operator

subscript operator is used with char elements

subscript operator is used with string elements

subscript operator has a lower precedence than the assignment operator

23 / 52

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

dereference

reference

binary operations

heap operations

24 / 52

How many parameters does a default constructor require?

25 / 52

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

26 / 52

Pick out the correct statement.

Increment operator ++ adds 2 to its operand

Decrement operator ++ subtracts 1 to its operand

Decrement operator ++ subtracts 3 to its operand

Increment operator ++ adds 1 to its operand

27 / 52

Which operator works only with integer variables?

increment

decrement

binary operator

both increment & decrement

28 / 52

Pick out the correct statement.

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

virtual functions does give the ability to write a templated 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

29 / 52

What is syntax of defining a destructor of class A?

A::A(){}

~A(){}

~A(){};

A(){}

30 / 52

Which of the following is correct?

Destructor is used to initialize objects

Destructor definition starts with !

There can be more than one destructor in a class

Destructors can be virtual

31 / 52

Pick out the correct statement.

Increment operator ++ adds 1 to its operand

Decrement operator ++ subtracts 1 to its operand

Increment operator ++ adds 2 to its operand

Decrement operator ++ subtracts 3 to its operand

32 / 52

What is the role of a constructor in classes?

To modify the data whenever required

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

To call private functions from the outer world

To destroy an object

33 / 52

How many types are there in increment/decrement operator?

34 / 52

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

Constructor has the same name as the class itself

Constructors do not return anything

All of the mentioned

Constructors are automatically called when an object is created

35 / 52

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

str.size()

str.length()

both size() and length() function

str.max_size()

36 / 52

What is the role of destructors in Classes?

To destroy an object when the lifetime of an object ends

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

37 / 52

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

#include <string>

#include <string.h>

#include <cstring>

#include <string.cpp>

38 / 52

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

Compiler provides a default constructor to avoid faults/errors

Segmentation fault

Objects are not created properly

Error occurs

39 / 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 object ?callable? like a function

It makes the argument ?callable? like a function

40 / 52

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

Any of the above can be used

String

STRING

string

41 / 52

Which concepts does the Pre Increment use?

call by value

queue

call by reference

call by name

42 / 52

How many Destructors are allowed in a Class?

Any number

43 / 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

44 / 52

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

non-static member function

dynamis_cast

static member function

static_cast

45 / 52

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

both append & operator+=

data

operator+=

append

46 / 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

47 / 52

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

as many as possible

48 / 52

Which operator works only with integer variables?

increment

both increment & decrement

binary operator

decrement

49 / 52

What will happen when the function call operator is overloaded?

It will modify the functions

It will modify the object

It will modify the operator to be interpreted

It will not modify the functions

50 / 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 define init() function

All of the mentioned

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

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

51 / 52

What is the use of function call operator?

overloading the parameters

overloading the methods

overloading the string

overloading the objects

52 / 52

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

length

name

size

both size & length

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