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Interview question based on skill :

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Total Questions: 20

1. What is the output of the following C++ code? #include #include using namespace std; int main () { std::string str ("Sanfoundry."); str.back() = '!'; std::cout << str << endl; return 0; }

A. swap(arr1, arr2);

B. arr1.swap(arr2);

C. swap(arr1, arr2);

D. swap[arr1, arr2];

Correct Answer is : arr1.swap(arr2);

2. What is the output of the following C++ code? #include #include using namespace std; int main () { string str = "Sanfoundry!"; cout<

A. To check whether the size of an array is zero or not

B. To check whether an array is empty or not

C. To check how many elements are there in the array

D. To check whether an array contains negative elements or not

Correct Answer is : To check whether the size of an array is zero or not

3. Which is an instantiation of the basic_string class template?

A. To fill an array with a given single value

B. To delete all the elements that are equal to the given value

C. To replace all the elements of the array which are equal to the given value

D. To check whether given element fills the array or not

Correct Answer is : To fill an array with a given single value

4. Which character is used to terminate the string?

A. 22222

B. 20000

C. 2

D. 20002

Correct Answer is : 22222

5. Where are the strings stored?

A.

B.

C.

D.

Correct Answer is :

6. What will happen if a string is empty?

A. f.assign({1,2,3,4,5})

B. f.assign(10,5)

C. both f.assign({1,2,3,4,5}) and f.assign(10,5)

D. f.assign(1,1,1,1)

Correct Answer is : both f.assign({1,2,3,4,5}) and f.assign(10,5)

7. How many types of representation are in the string?

A. Vector is contiguous whereas List is non-contiguous

B. Insertion in the list takes constant time whereas it is not constant in vectors

C. There is no capacity defined for list

D. All of the mentioned

Correct Answer is : All of the mentioned

8. What is the header file for the string class?

A. forward_list f;

B. forward_list f;

C. forward_list f;

D. forward_list f;

Correct Answer is : forward_list f;

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

A.

B.

C.

D.

Correct Answer is :

10. The data elements in the structure are also known as what?

A. v.begin()

B. v.cbegin()

C. v[0]

D. all of the mentioned

Correct Answer is : all of the mentioned

11. What will be used when terminating a structure?

A. v.end()

B. v.cend()

C. both v.end() and v.cend()

D. vectors do not have a function to access the last element

Correct Answer is : vectors do not have a function to access the last element

12. What will happen when the structure is declared?

A. both are same

B. begin() returns iterator to first element and cbegin() returns iterator to last element

C. begin() returns an iterator to first element whereas cbegin() returns constant iterator to first element

D. begin() returns returns first element cbegin() returns void

Correct Answer is : begin() returns an iterator to first element whereas cbegin() returns constant iterator to first element

13. The declaration of the structure is also called as?

A. both are the same

B. begin() returns an iterator to the first element and rbegin() returns an iterator to an element kept at the end of the vector

C. begin() returns an iterator to first element whereas rbegin() returns constant iterator to first element

D. begin() returns returns first element rbegin() returns void

Correct Answer is : begin() returns an iterator to the first element and rbegin() returns an iterator to an element kept at the end of the vector

14. What will be the output of this program? #include using namespace std; int main() { struct ShoeType { string style; double price; }; ShoeType shoe1, shoe2; shoe1.style = "Adidas"; shoe1.price = 9.99; cout << shoe1.style << " $ "<< shoe1.price; shoe2 = shoe1; shoe2.price = shoe2.price / 9; cout << shoe2.style << " $ "<< shoe2.price; return 0; }

A. 1 2 3 4 5

B. 3 2 3 4 5

C. 5 4 3 2 1

D. 3 3 3 3 3

Correct Answer is : 3 2 3 4 5

15. Which of the following is a properly defined structure?

A. v.size()

B. v.capacity()

C. v.max_size()

D. v.no_of_elements()

Correct Answer is : v.size()

16. Which of the following accesses a variable in structure *b?

A. v.size()

B. v.capacity()

C. v.max_size()

D. v.no_of_elements()

Correct Answer is : v.capacity()

17. subscript operator is used to access which elements?

A. Vector increases its capacity one by one

B. Vector doubles its capacity after it is full

C. Vector increases its capacity by half of its previous size

D. Vector increases its capacity by a constant factor

Correct Answer is : Vector doubles its capacity after it is full

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

A. 8

B. 10

C. 5

D. 6

Correct Answer is : 10

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

A. 10

B. 8

C. 50

D. 60

Correct Answer is : 50

20. What is meant by template parameter?

A. 5

B. 1

C. 4

D. 3

Correct Answer is : 4