Part - 2 Cpp programming Solved MCQ

C++ Programming Questions
Useful for all Companies Interviews,
UGC-NET, GATE EXAM
PART- 2

. What is the output of this program?
1.#include
2.using namespace std;
3.void duplicate (int& a, int& b, int& c)
4.{
5.a *= 2;
6.b *= 2;
7.c *= 2;
8.}
9.int main ()
10.{
11.int x = 1, y = 3, z = 7;
12.duplicate (x, y, z);
13.cout << x << y << z;
14.return 0;
15.}
a) 1468
b) 2812
c) 2614
d) none of the mentioned
View Answer
Answer:c

. What is the use of functor?
a) It makes the object “callable” like a function.
b) It makes the class “callable” like a function.
c) It makes the attribute “callable” like a
function.
View Answer
Answer:a
Pick out the correct option.
a) References automatically dereference
without needing an extra character.
b) References automatically dereference with
an extra character.
c) Reference will not dereference
View Answer
Answer:a

1. Which is used to tell the computer that
where a pointer is pointing to?
a) dereference
b) reference
c) heap operations
View Answer
Answer:a
Explanation:None.
2. Which is used to do the dereferencing?
a) pointer without asterix
b) value without asterix
c) pointer with asterix
d) value with asterix
View Answer
Answer:c

4. What is the output of this program?
1.#include <iostream>
3.int main()
4.{
5.int a, b;
6.int* c;
7.c = &a;
8.a = 200;
9.b = 200;
10.*c = 100;
11.b = *c;
12.cout << *c << " " << b;
13.return 0;
14.}
a) 100 200
b) 100 0
c) 200 200
d) 100 100
View Answer
Answer:d

3.int main()
4.{
5.int x;
6.int *p;
7.x = 5;
8.p = &x;
9.cout << *p;
10.return 0;
11.}
a) 5
b) 10
c) memory address
View Answer
Answer:a

3.int main()
4.{
5.int x = 9;
6.int* p = &x;
7.cout << sizeof(p);
8.return 0;
9.}
a) 4
b) 2
c) Depends on compiler
View Answer
Answer:c

1. Which operator works only with integer
variables?
a) increment
b) decrement
c) both a & b
d) None of the mentioned
View Answer
Answer:c
Explanation:None.
2. How many types are there in
increment/decrement operator?
a) 1
b) 2
c) 3
d) 4
View Answer
Answer:b

3. Pick out the correct statement.
a) Increment operator ++ adds 1 to its operand
b) Increment operator ++ adds 2 to its operand
c) Decrement operator ++ subtracts 1 to its
operand
View Answer
Answer:a
Which symbol is used to create multiple
inheritance?
[A] Dot
0%
[B] Comma
0%
[C] Dollar
0%
[D] None of the mentioned
0%
Answer: B. Comma

9. What does the dereference operator will return?
a) rvalue equivalent to the value at the pointer address.
b) lvalue equivalent to the value at the pointer address.
c) it will return nothing
View Answer
Answer:b
Explanation:It operates on a pointer variable, and returns an l-value equivalent to the value at
the pointer address.
10. Pick out the correct statement.
a) The NULL pointer dereference occurs where a pointer that is expected to be a
valid address but instead is equal to NULL.
b) The NULL pointer dereference occurs where a pointer that is expected to be a
valid address but instead is equal to memory address.
c) both a & b
View Answer
Answer:a

1.#include <stdio.h>
3.int main()
4.{
5.int a = 21;
6.int c ;
7.c = a++;
8.cout << c;
9.return 0;
10.}
a) 21
b) 22
c) 23
d) 20
View Answer
Answer:a

. What is the output of this program?
3.int main()
4.{
5.int x = 5, y = 5;
6.cout << ++x << --y << endl;
7.return 0;
8.}
a) 55
b) 64
c) 46
d) 45
View Answer
Answer:b

1. How many types of representation are in string?
a) 1
b) 2
c) 3
d) 4
View Answer
Answer:b
2. What is the header file for the string class?
a) #include<ios>
b) #include<str>
c) #include<string>
View Answer
Answer:c

3. Which is used to return the number of
characters in the string?
a) length
b) size
c) both a & b
View Answer
Answer:c

9. Pick out the correct statement
a) Preincrement is faster than postincrement.
b) postincrement is faster than preincrement.
c) Both a & b
View Answer
Answer:a
Explanation:Because preincrement take one
byte instruction & post increment takes two
byte instruction.
10. Which concepts does the preincrement
uses?
a) call by value
b) call by reference
c) queue
View Answer
Answer:b

3.int main()
4.{
5.int x = 5, y = 5, z;
6.x = ++x; y = --y;
7.z = x + ++x;
8.cout << z;
9.return 0;
10.}
a) 11
b) 12
c) 13
d) 14
View Answer
Answer:d

What is the output of this program?
3.int main()
4.{
5.int x = 5, y = 5, z;
6.x = ++x; y = --y;
7.z = x++ + y--;
8.cout << z;
9.return 0;
10.}
a) 10
b) 11
c) 9
d) 12
View Answer
Answer:a

3.int main()
4.{
5.int num1 = 5;
6.int num2 = 3;
7.int num3 = 2;
8.num1 = num2++;
9.num2 = --num3;
10.cout << num1 << num2 << num3;
11.return 0;
12.}
a) 532
b) 235
c) 312
d) 311
View Answer
Answer:d

. Which method do we use to append more
than one character at a time?
a) append
b) operator+=
c) data
d) both a & b
View Answer
Answer:d
. Which is also called as abstract class?
a) virtual function
b) pure virtual function
c) derived class
View Answer
Answer:b

1. Which class is used to design the base class?
a) abstract class
b) derived class
c) base class
View Answer
Answer:a
Explanation:None.
2. Which is used to create a pure virtual
function ?
a) $
b) =0
c) &
d) !
View Answer
Answer:b

2.#include <string>
4.int main ()
5.{
6.string str ("microsoft");
7.string::reverse_iterator r;
8.for (r = str.rbegin() ; r < str.rend(); r++ )
9.cout << *r;
10.return 0;
11.}
a) microsoft
b) micro
c) tfosorcim
d) tfos
View Answer
Answer:c

8. What is meant by pure virtual function?
a) Function which does not have definition of its own.
b) Function which does have definition of its own.
c) Function which does not have any return type.
View Answer
Answer:a
Explanation:As the name itself implies, it have to depend on other class only.
9. Pick out the correct option.
a) We cannot make an instance of an abstract base class
b) We can make an instance of an abstract base class
c) Both a & b
View Answer
Answer:a
Explanation:None.

10. Where does the abstract class is used?
a) base class only
b) derived class
c) both a & b
View Answer
Answer:a
3. To which type of class, We can apply RTTI?
a) Encapsulation
b) Polymorphic
c) Derived
View Answer
Answer:b

1. What is the Run-Time Type Information?
a) Information about an object’s datatype at
runtime
b) Information about the variables
c) Information about the given block
View Answer
Answer:a
Explanation:With the help of RTTI, We can get
the information about the data type at the
runtime.
2. Which operators are part of RTTI?
a) dynamic_cast()
b) typeid
c) Both a & b
View Answer
Answer:c
Explanation:The dynamic_cast<> operation
and typeid operator in C++ are part of RTTI.

. What is meant by type_info?
a) Used to hold the type information returned
by the typeid operator
b) Used to hold the type information returned
by the dynamic_cast
c) Used to hold the type information returned
by the static cast
View Answer
Answer:a
Explanation:None.
10. At which time does the static_cast can be
applied?
a) Compile-time construct
b) Runtime construct
c) Both a & b
View Answer
Answer:a

1. How many access specifiers are there in
c++?
a) 1
b) 2
c) 3
d) 4
View Answer
Answer:c
Explanation:There are three access specifiers
in c++. They are public, Private and Protected.
2. What of the following describes protected
access specifier?
a) The variable is visible only outside inside the
block
b) The variable is visible everywhere
c) The variable is visible to its block and to it’s
derived class
View Answer
Answer:c

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