Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

What is the use of <exception> header

Contains the standard exception files
Contains the standard library files
It is used to arise an exception in the program
None of the mentioned

Discuss Question

Answer: Option A. -> Contains the standard exception files

None.

Question 2.

Pick out parameter for rehash method in unordered_set in c++?

count
size
hash
None of the mentioned

Discuss Question

Answer: Option A. -> count

count is used to return the new number of buckets.

Question 3.

What is meant by standard c++ library?

It is the collection of class definitions for standard data structures and a collection of algorithms
It is a header file
Both a & b
None of the mentioned

Discuss Question

Answer: Option A. -> It is the collection of class definitions for standard data structures and a collection of algorithms

It is the collection of class definitions for standard data structures. This part of the library was

derived from the Standard Template Library.

Question 4.

Pick out the wrong header file.
a) <algorithm>
b) <containers>
c) <iterators>
d) <process>

It is the collection of class definitions for standard data structures and a collection of algorithms
It is a header file
Both a & b
None of the mentioned

Discuss Question

Answer: Option A. -> It is the collection of class definitions for standard data structures and a collection of algorithms

Answer: (d)
Explanation:None.

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
#include
4.
using namespace std ;
5.
typedef list LISTSTR;
6.
int main()
7.
{
8.
LISTSTR :: iterator i;
9.
LISTSTR test;
10.
test.insert(test.end(), "one");
11.
test.insert(test.end(), "two");
12.
LISTSTR test2(test);
13.
LISTSTR test3(3, "three");
14.
LISTSTR test4(++test3.begin(),
15.
test3.end());
16.
cout

test
test one
test two
None of the mentioned

Discuss Question

Answer: Option D. -> None of the mentioned

In this program, We used the list to manipulate the given value.
Output:
$ g++ std3.cpp
$ a.out
test: one
two
test: one
two
test: three
three
three
test: three
three

Question 6.

What is the output of this program?

1.
#include
2.
#include
3.
#include
4.
using namespace std;
5.
int main()
6.
{
7.
queue q;
8.
q.push('a');
9.
q.push('b');
10.
q.push('c');
11.
cout

ab
abc
a
Error

Discuss Question

Answer: Option B. -> abc

In this program, We used the queue to process the given input.
Output:
$ g++ std1.cpp
$ a.out
abc

Question 7.

1. Pick out the wrong header file about strings.
a) <string>
b) <regex>
c) <ios>
d) None of the mentioned

no trailing underscores on names
complex objects are returned by value
have a member-swap()
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned

Answer:c
Explanation:The standard header files for string is string and regex. So the wrong one presented

here is ios.

Question 8.

What is meant by vector in the container library contains?

It is a sequence container that encapsulates dynamic size arrays
It is a sequence container that encapsulates static size arrays
It manages the memory
None of the mentioned

Discuss Question

Answer: Option A. -> It is a sequence container that encapsulates dynamic size arrays

vector in the container library contains sequence container that manipulates and encapsulates

dynamic size arrays.

Question 9.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main()
5.
{
6.
vector v;
7.
v.assign( 10, 42 );
8.
for (int i = 0; i < v.size(); i++)
9.
{
10.
cout