Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

Which is optional in the declaration of vector?

Type
Name
Vector
Number_of_elements

Discuss Question

Answer: Option D. -> Number_of_elements

The number of elements is optional. An empty vector means, A vector that contains zero elements.

Question 2.

Pick out the correct statement about vector.
a) vector<int> values (5)
b) vector values (5)
c) vector<int> (5)
d) None of the mentioned

Type
Name
Vector
Number_of_elements

Discuss Question

Answer: Option D. -> Number_of_elements

Answer:a
Explanation:The syntax for declaring the vector element is vector<type> variable_name (number

_of_elements);

Question 3.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
vector first;
7.
first.assign (7,100);
8.
vector::iterator it;
9.
it=first.begin()+1;
10.
int myints[] = {1776,7,4};
11.
cout

Discuss Question

Answer: Option D. -> 7

In this program, We are finding the size of the vector elements and resizing it.
Output:
$ g++ vect3.cpp
$ a.out
7

Question 4.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
vector myvector (5);
7.
int* p = myvector.data();
8.
*p = 10;
9.
++p;
10.
*p = 20;
11.
p[2] = 100;
12.
for (unsigned i = 0; i < myvector.size(); ++i)
13.
cout

10 20 0 100 0
10 20 0 100
10 20 0
10 20

Discuss Question

Answer: Option A. -> 10 20 0 100 0

In this program, We are allocating the values to the vector and unallocated values are left as zero.
Output:
$ g++ vect4.cpp
$ a.out
10 20 0 100 0

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
vector a (3, 0);
7.
vector b (5, 0);
8.
b = a;
9.
a = vector();
10.
cout

Discuss Question

Answer: Option D. -> 7

Answer:a
Explanation:In this program, We are finding the size of the vector elements.
Output:
$ g++ vect2.cpp
$ a.out
Size of a 0
Size of b 3

Question 6.

In which type of storage location are the vector members stored?

Contiguous storage locations
Non-contiguous storage locations
Both a & b
None of the mentioned

Discuss Question

Answer: Option A. -> Contiguous storage locations

Vectors use contiguous storage locations for their elements, which means that their elements

can also be accessed using offsets on regular pointers to its elements

Question 7.

What do vectors represent?

Static arrays
Dynamic arrays
Stack
Queue

Discuss Question

Answer: Option B. -> Dynamic arrays

Vectors are sequence containers representing arrays that can change in size.

Question 8.

How many vector container properties are there in c++?

Discuss Question

Answer: Option C. -> 3

There are three container properties in c++. They are sequence, Dynamic array and allocator-aware.

Question 9.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
unsigned int i;
7.
vector first;
8.
vector second (4, 100);
9.
vector third (second.begin(), second.end());
10.
vector fourth (third);
11.
int myints[] = {16, 2, 77, 29};
12.
vector fifth (myints, myints + sizeof(myints) / sizeof(int) );
13.
for (vector :: iterator it = fifth.begin(); it != fifth.end(); ++it)
14.
cout

16
16 2
16 2 77
16 2 77 29

Discuss Question

Answer: Option D. -> 16 2 77 29

In this program, We got the values and printing it by using the vector and we are contructing vectors.
Output:
$ g++ vect.cpp
$ a.out
16 2 77 29

Question 10.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
vector myvector;
7.
int sum (0);
8.
myvector.push_back (100);
9.
myvector.push_back (200);
10.
myvector.push_back (300);
11.
while (!myvector.empty())
12.
{
13.
sum += myvector.back();
14.
myvector.pop_back();
15.
}
16.
cout