Almost 300 Solved MCQs of CS201
By
Default constructor takes _________.
one parameter
two parameters
no parameters
character type parameter
All the preprocessors directives start with ________.
$
&
#
_
The members of a class declared with the keyword struct are _____________by default.
static
private
protected
public
Loops are _______________ Structure
Decision
Sequential
Repetition
None of the given options
We cannot use ______________ pointer for storing and reading data from it.
NULL
integer
double
zero
1
When an object of a class is defined inside another class then,
Destructor of enclosing class will be called first
Destructor of inner object will be called first Constructor
and Destructor will be called simultaneously None of the
given options
Consider the following code segment. Which of the following will be called while
executing code at line 2? String s1 , s2; s1 = s2 ;
Copy constructor
Default constructor
Assignment operator
Parameterized constructor
We cannot increment ________________.
pointers
arrays
references
variables
In statement Matrix m2 = m1 ;
Assignment operator is being used
Copy constructor is being used.
Statement has syntax error
None of the given options
From the following; which on is the correct syntax of an array declaration: array size is
5 and it is of float data type?
float [5] name;
name[5] float;
float name[5];
None of the given options
If an array has 50 elements, what is allowable range of subscripts?
0 – 49 1 – 49 0 – 50 1 – 50
2
A structure is a collection of _____________under a single name.
values
variables
data
None of the given
If a function has not been declared before its definition, It is a
logical error
syntax error
run time error
None of these
When the if statement consists more than one statement then enclosing these statement in
curly braces is,
Not required
Good programming
Relevant
Must
__________ allow us to have a memory location and use it as int or char interchangeably
structures
union
construct
None of the given
In Analysis, we try to have a______________
Determined the inputs
Break up of problem
Precise problem statement
None of the given
_______________function give the position of the next character to be read from that
file.
tellp()
tellg()
seekg()
seekp()
3
Pointers store the ____________________
value of a variable
memory address
characters
None of the given
In order to get the right most digit of a number, we divide this number by 10 and take its
Remainder
Quotient
Divisor
None of the given options
___________ Returns true if c is a digit and false otherwise.
int isalpha( int c )
int isalnum( int c )
int isxdigit( int c )
int isdigit( int c )
If int a = 50; then the value of a/= 3; will be,
15
18
16
17
_______________________ contains functions for manipulations of character data.
ctype.h
iostream.h
string.h
None of the given
____________________ Returns true if c is a digit or a letter and false otherwise.
int isalpha( int c )
int isalnum( int c )
int isxdigit( int c )
int isdigit( int c )
4
If int sum = 54; Then the value of the following statement is sum = sum - 3 ;
52
50
51
57
To get the value stored at a memory address, we use the________________
referencing operator
dereferencing operator
simple operator
None of the given
In C/C++; by default arguments are passed by _______ to a function.
Reference
Value
Type
Data
The string in the array is terminated by a _______
zero
nil
null
one
Structures are syntactically defined with the word_____________.
struc
struct
structure
None of the given
C is widely known as development language of _______ operating system.
Linux
Unix
Windows
Mac OS
5
At the___________, we try to break up the problem into functional units
analysis phase
design phase
Implementation phase
None of the given
While developing a program; should we think about the user interface?
Yes
No
What will be the result of arithmetic expression 5+25/5*5?
45
6
30
9
Why we use "cin"?
To send data to printer
To read data from keyboard
To display message
To display output on the screen
_________operator uses the sign ^.
Bit-wise OR
Exclusive OR
AND Operator
NOT operator
6
C++ is a_________________ language.
High level
Low level
Machine
Fourth Generation
12 & 8 = (1000) 2 =________. & is used to AND two numbers bit-wise
4
8
6
12
From the following; which one is used as an assignment operator?
Equal sign ‘=’
Double equal sign ‘==’
Both equal and double equal sign
None of the given options
What will be the value of ‘a’ and ‘b’ after executing the following statements? int a = 9;
int b = a++; cout<<
10,9
9,10
9,9
10,10
These functions seekg() and seekp() requires an argument of type ____________to let
them how many bytes to move forward or backward.
int
short
long
double
7
A character is stored in the memory in _________
byte
integer
string
None of the given
dereferencing operator is represented by _______
*
+
–
None of the given
______________ transfers the executable code from main memory to hard disk.
Loader
Debugger
Compiler
Linker
When the logical operator OR (||) combine two expressions exp1 and exp2 then the result
will be false only,
When both exp1 and exp2 are true
When both exp1 and exp2 are false
When exp1 is true and exp2 is false
When exp1 is false and exp2 is true
suppose we have int y[10]; To access the 4th element of the array we write_________
y[4];
y[3];
y[2];
none of given
8
we have opened a file stream myfile for reading (getting), myfile.tellg () gives us the
current get position of the file pointer. It returns a whole number of type___________
long
int
short
double
ofstream is used for________
Input file stream
Output file stream
Input and output file stream
All of the given
A structure is a collection of _____________under a single name.
values
variables
data
None of the given
The first character of a variable name must be an alphabet or
► Underscore
► Digit
► Special character
► Comma
Suppose int multi[5][10]; when we are using **multi , it means,
► Single dereferencing
► Single referencing
► Double referencing
► Double dereferencing
9
eof( ), bad( ), good( ), clear( ) all are manipulators.
► True
► False
http://vustudents.ning.com
It is possible to return an object from a function through this pointer.
► True
► False
Function implementation of friend function must be defined outside the class.
► True
► False
The default scope for members of structures is public whereas the default visibility for
class members is private.
► True
► False
The operator function of << and >> operators are always the member function of a class.
► True
► False
10
How many bytes are occupied by declaring following array of characters?
char str[] = “programming”;
► 10
► 11
► 12
► 13
What does STL stand for?
► Source template library
► Standard template library
► Stream template library
► Standard temporary library
Which of the following array is the most suitable for storing a matrix structure
► Single-dimensional array
► Two-dimensional array
► Three-dimensional array
► Four-dimensional array
What will be the output of following code segment?
main(){
int x = 5 ;
int x = 4 ;
11
cout << x << “,” ;
cout << x ;
► 5, 5
► 4, 4
► 4, 5
► 5, 4
Single line comments explaining code would be preceded like in the following example.
► /*
► //
►/
► //*
The ________ statement interrupts the flow of control.
► switch
► continue
► goto
► break
12
Which of the following will be the correct function call for function prototype
given below?
int func (int &);
► func(int num);
► func(&num);
► func(num);
► func(*num);
If there is a symbol (& sign) used with the variable name followed by data type then
it refers to _____ and if & is being used with variable name then it refers to _____.
► Address of variable, reference variable
► Reference variable, value of variable
► Reference variable, address of variable
► Address of variable, value of variable
Which of the following operator the compiler overloads for objects by default?
► + operator
► - operator
► = operator
► == operator
13
If overloaded plus operator is implemented as member function then which of the
following option will be true for the statement given below?
obj3 = obj1 + obj2 ;
► obj1 will be passed as an argument to + operator whereas obj2 will drive the +
operator
► obj1 will drive the + operator whereas obj2 will be passed as an argument to
+ operator
► Both objects (obj1, obj2) will be passed as arguments to the + operator
► Any of the objects (obj1, obj2) can drive the + operator
The operator function will be implemented as _____, if both objects (obj1, obj2)
are passed as arguments to - operator in the statement given below.
obj3 = obj1 - obj2;
► friend function
► member function
► non-member function
► either non-member or friend function
The input/output streams cin and cout are ________ therefore have _______.
► Structures, function
► Objects, member functions
► Functions, objects
► None of the given options
14
What will be the output of following statement?
cout << setfill(‘0’) << setw(7) << 128
► 0000128
► 0128128
► 1280000
► 0012800
http://vustudents.ning.com
The static data members of a class will be ________
► shared by objects
► created for each object
► initialized within class
► initialized within main function
Which of the following is used for allocating space for static variables?
► Heap
► Static storage area
► Free store
► Stack
15
Templates provide way of abstracting ______________ information.
► type
► data
► method
► access
A pointer is a special type of variable that contain ___________
► Memory Address
► Data values
► Both Values and Memory
► None of given of options
Which is NOT a protection level provided by classes in C++?
► protected
► hidden
► private
► public
Users must not know about ____________________.
► Functions Name within Class
► Class implementation of Functionality and Interfaces
► Methods Functionality with in Class
► None of the given options
16
Assignment operator is used to initialize a newly declared object from existing object
► True
► False
The operator function for << (stream insertion) >> and stream extraction must be
► Member function of class
► Non-member function of class
► Both member and non-member function
► None of the given options
http://vustudents.ning.com
A template function must have
► One or more than one arguments
► Only one argument
► Zero arguments
► None of the given options
Truth tables are used for analyzing ___________.
► logical expressions
► arithmetic expressions
► both logical and arithmetic expressions
► none of the given options.
17
Which of the following array is the most suitable for storing a matrix structure?
► Single-dimensional array
► Two-dimensional array
► Three-dimensional array
► Four-dimensional array
How many bytes are occupied by declaring following array of
characters? char str[] = “programming”;
► 10
► 11
► 12
► 13
11 bytes for 11characters of word programming and 1 for '\n'
When we do dynamic memory allocation in the constructor of a class, then it is necessary
to provide a destructor.
► True
► False
18
The prototype of friend functions must be written ____ the class and its definition
must be written ____
► inside, inside the class
► inside, outside the class
► outside, inside the class
► outside, outside the class
Copy constructor becomes necessary while dealing with _______allocation in the class.
► Dynamic memory
► Static memory
► Both Dynamic and Static memory
► None of the given options
Dealing with structures and functions passing by reference is the most economical
method
► True
► False
1st...what is the function of flush commond?
1): when we specify the buffer size, normally the operating system or compiler does this
for us. A typical size of buffer is 512 bytes. When the information is of 512 byte size,
output will take place. But in the program, we may want at some point that whatever is in
the buffer, show them. For that purpose the normal mechanism is flush. Flush the stream.
The flush command forces the data from the buffer to go to its destination which is
normally a screen or file and make the buffer empty. Lec 34
2nd...what are the types of tamplates?
a template is a sketch to draw some shape or figure.
There are two different types of templates in C++ language i.e.’ function templates
and class templates. Lec 41
19
The declarator of Plus (+) member operator function is
► Class-Name operator + (Class-Name rhs)
► operator Class-Name + ( )
► operator Class-Name + ( rhs)
► Class-Name operator + ( )
12 & 8 = (1000) 2 =________. & is used to AND two numbers bit-wise
Select correct option:
4
8
6
12
Is ka answer 8 hy, see handouts page number 246.
Truth table for &
Bit1 Bit2 Bit1 & Bit2
1 1 1
1 0 0
0 1 0
0 0 0
Therefore, when we apply the conditions, we get
12 = 1 1 1 0 (binary conversion of 12)
8 = 1 0 0 0 (binary conversion of 8)
------------------------------------------------------------
1 0 0 0, which is equals to 8
The reserved words public and private comes under the category
Which of the following operators can not be overloaded?
1) :new
2) :delete
3) :+=
4) :sizeof
20
The reserved words public and private comes under the category
1) :structures
2) :strings
3) :accessibility modifiers
4) :types of functions
Question No: 10 ( Marks: 1 ) - Please choose one
What is the sequence of event(s) when allocating memory using new operator?
► Only block of memory is allocated for objects
► Only constructor is called for objects
► Memory is allocated first before calling constructor
► Constructor is called first before allocating memory
Question No: 11 ( Marks: 1 ) - Please choose one
What is the sequence of event(s) when deallocating memory using delete operator?
► Only block of memory is deallocated for objects
► Only destructor is called for objects
► Memory is deallocated first before calling destructor
► Destructor is called first before deallocating memory
Question No: 12 ( Marks: 1 ) - Please choose one
new and delete operators cannot be overloaded as member functions.
► True
► False
Question No: 13 ( Marks: 1 ) - Please choose one
The operator function of << and >> operators are always the member function of a
class.
► True
► False
Question No: 14 ( Marks: 1 ) - Please choose one
A template function must have at least ---------- generic data type
► Zero
► One
► Two
► Three
21
Question No: 15 ( Marks: 1 ) - Please choose one
If we do not mention any return_value_type with a function, it will return an _____
value.
► int
► void
► double
► float
Question No: 16 ( Marks: 1 ) - Please choose one
Suppose a program contains an array declared as int arr[100]; what will be the size of
array?
►0
► 99
► 100
► 101
Question No: 17 ( Marks: 1 ) - Please choose one
The name of an array represents address of first location of array element.
► True
► False
Question No: 18 ( Marks: 1 ) - Please choose one
Reusing the variables in program helps to save the memory
► True
► False
Question No: 19 ( Marks: 1 ) - Please choose one
Which of the following option is true about new operator to dynamically
allocate memory to an object?
► The new operator determines the size of an object
► Allocates memory to object and returns pointer of valid type
► Creates an object and calls the constructor to initialize the object
► All of the given options
22
Question No: 20 ( Marks: 1 ) - Please choose one
new and delete are _____ whereas malloc and free are _____.
► Functions, operators
► Classes, operators
► Operators, functions
► Operators, classes
Question No: 21 ( Marks: 1 ) - Please choose one
Like member functions, ______ can also access the private data members of a class.
► Non-member functions
► Friend functions
► Any function outside class
► None of the given options
Question No: 22 ( Marks: 1 ) - Please choose one
Which of the following statement is best regarding declaration of friend function?
► Friend function must be declared after public keyword.
► Friend function must be declared after private keyword.
► Friend function must be declared at the top within class definition.
► It can be declared anywhere in class as these are not affected by the public
and private keywords.
Question No: 23 ( Marks: 1 ) - Please choose one
The operator function overloaded for an Assignment operator (=) must be
► Non-member function of class
► Member function of class
► Friend function of class
► None of the given options
Question No: 24 ( Marks: 1 ) - Please choose one
For non-member operator function, object on left side of the operator may be
► Object of operator class
► Object of different class
► Built-in data type
► All of the given options
23
Question No: 25 ( Marks: 1 ) - Please choose one
The operator function will be implemented as _____, if obj1 drive the - operator whereas
obj2 is passed as arguments to - operator in the statement given below.
obj3 = obj1 - obj2;
► Member function
► Non-member function
► Friend function
► None of the given options
Question No: 26 ( Marks: 1 ) - Please choose one
Which one of the following is the declaration of overloaded pre-increment
operator implemented as member function?
► Class-name operator +() ;
► Class-name operator +(int) ;
► Class-name operator ++() ;
► Class-name operator ++(int) ;
Question No: 27 ( Marks: 1 ) - Please choose one
The static data members of a class are initialized _______
► at file scope
► within class definition
► within member function
► within main function
Question No: 28 ( Marks: 1 ) - Please choose one
Class is a user defined___________.
► data type
► memory referee
► value
► none of the given options.
http://vustudents.ning.com
Question No: 29 ( Marks: 1 ) - Please choose one
We can also define a user-defines manipulators.
► True
► False
24
Question No: 30 ( Marks: 1 ) - Please choose one
Automatic variable are created on ________.
► Heap
► Free store
► static storage
► stack
Question No: 3 ( Marks: 1 ) - Please choose one
A pointer variable can be,
► Decremented only
► Incremented only
► Multiplied only
► Both 1 and 2
Question No: 4 ( Marks: 1 ) - Please choose one
setprecision is a parameter less manipulator.
► True
► False
Question No: 5 ( Marks: 1 ) - Please choose one
We can change a Unary operator to Binary operator through operator overloading.
► False
► True
25
What is the functionality of the following statement?
String str[5] = {String(“Programming”), String(“CS201”)};
► Default constructor will call for all objects of array
► Parameterized constructor will call for all objects of array
► Parameterized constructor will call for first 2 objects and default constructor
for remaining objects
► Default constructor will call for first 3 objects and Parameterized constructor
for remaining objects
There is an array of characters having name ‘course’ that has to be initialized by string
‘programming’ which of the following is the correct way to do this,
i. course[] = {‘p’, ’r’, ’o’, ’g’, ’r’, ’a’, ’m’, ’m’, ’i’, ’n’, ’g’};
ii.course[] = ‘programming’ ;
iii. course[12] = “programming” ;
iv. course = “programming” ;
Choose the correct options.
► (i) and (ii) only
► (i) and (iv) only
► (i) and (iii) only
► (ii) and (iii) only
26
Overloaded member operator function is always called by _______
► Class
► Object
► Compiler
► Primitive data type
Consider the following code segment
class M {
friend int operator!(const M &);
...
};
!s // code of line implies that operator!(s)
...
Let assume if s is an object of the class then function is implemented as ___________
► Member function
► Non-member function
► Binary operator function
► None of the given options
None of the given options
27
Copy constructor becomes necessary while dealing with _______allocation in the class.
► Dynamic memory
► Static memory
► Both Dynamic and Static memory
► None of the given options
1) C/C++ string constant is enclosed in http://vustudents.ning.com
Small braces
Curly braces
Double quote
Single quote
2) Unary operator takes argument
Zero
One
Two
Three
3) When define array of
objects Constructor will call
Destructor will call
28
The size of int data type is
► 1 bytes
► 2 bytes
► 3 bytes
► 4 bytes
In Flow chart process is represented by
► Rectangle
► Arrow symbol
► Oval
► Circle
If the break statement is missed in switch statement then,
► The compiler will give error
► This may cause a logical error
► No effect on program
► Program stops its execution
When we are using const keyword with a variable x then initializing it at the time of
declaration is,
► Must
► Optional
► Not necessary
► A syntax error
Which of the following is the correct way to assign an integer value 5 to element of a
matrix say ‘m’ at second row and third column?
► m[2][3] = 5 ;
► m[3][2] = 5 ;
► m[1][2] = 5 ;
► m[2][3] = ‘5’;
How many total elements must be in two-dimensional array of 3 rows and 2 columns?
►4
►5
►6
►7
29
Which of the following is the correct statement for the following
declaration? const int *ptr.
► ptr is a constant pointer
ptr is constant integer pointer ►
► ptr is a constant pointer to int ptr
is a pointer to const int ►
Consider the following code segment. What will be the output of this code segment?
int arr[6] = {2, 3, 7, 4, 5, 6} ;
int *ptr1 =&arr[1] ;
int *ptr2 = &arr[4] ;
cout << (ptr2-ptr1) ;
►3
►9
► 12
►2
What will be the correct syntax to assign an array named arr of 5 elements to a
pointer ptr?
► *ptr = arr ;
ptr = arr ; ►
► *ptr = arr[5] ;
ptr = arr[5] ; ►
The variables having a name, type and size are just like empty boxes.
►False
True ►
What's wrong with this for loop?
for (int k = 2, k <=12, k++)
► the increment should always be ++k
► the variable must always be the letter i when using a for loop
► there should be a semicolon at the end of the statement
► the commas should be semicolons
30
Most efficient method of dealing with structure variables is to define the structure
globally
► True
False ►
Syntax of union is identical to ______
► Structure
► Class
► Function
► None of the given options
Like member functions, ______ can also access the private data members of a class.
Non-member functions
► Friend functions
Any function outside class
None of the given options
Function created with in function called?
nested
overloaded
grouped none
of them
31
