Interview Questions

1. Which of the following is used to read or extracts the data present in the file?

Options:

a. Output stream

b. Input stream

c. Both a & b

d. None of the above

Reveal Answer

2. For which of the following classes fstream base class acts as a base class?

Options:

a. ifstream

b. istream

c. fstream

d. ostream

e. ostream

f. streambuf

g. ofstream

Reveal Answer

3. Which of the following function is used to determine whether the stream object is associated with a file?

Options:

a. buf

b. string

c. is_open

d. None of the above

Reveal Answer

4. Which class is used to inherit put() function from ostream?

Options:

a. ifstream

b. ofstream

c. fstream

d. both a & c

Reveal Answer

5. Ifstream contains open() with default output mode.

Options:

a. True

b. False

Reveal Answer

6. Which operator is defined in istream class?

Options:

a. Overloaded insertion operator

b. Overloaded extraction operator

c. Scope resolution operator

d. None of the above

Reveal Answer

7. What is the unit of data in a stream of Text?

Options:

a. A character

b. A string

c. Can be any data type

d. Integer

Reveal Answer

8. Binary stream is used for:

Options:

a. Printing output to the screen or printer

b. Graphics or word processing documents

c. Reading mouse-input

d. Receiving input from the keyboard

e. Reading & writing to the modem

f. Embedded software

Reveal Answer

9. Which file supports the character translations?

Options:

a. Binary file

b. Text file

c. Both a & b

d. None of the above

Reveal Answer

10. Which header file does not exist in the following list?

Options:

a. iostream.h

b. string.h

c. sstring.h

d. fstream.h

Reveal Answer

11. What is the output of the following program? #include <iostream> using namespace std; int main () { ofstream outfile ("Demo.txt"); for (int n = 0; n < 50; n++) { outfile << n; outfile.flush(); } cout << "Finished"; outfile.close(); return 0; }

Options:

a. Finished

b. Compile time error

c. Runtime error

d. Program will not run

Reveal Answer

12. Which header file is used to create or read data files?

Options:

a. ofstream.h

b. fstream.h

c. ifstream.h

d. istream.h

Reveal Answer

13. Multiple files can be opened by using constructor function of the class.

Options:

a. True

b. False

Reveal Answer

14. Before opening the files, the filestream object should be ………………….

Options:

a. Created

b. Initialised

c. Declared

d. Both b & c

Reveal Answer

15. What is the mode for appending the data to the end of file?

Options:

a. ios :: out

b. ios :: nocreate

c. ios :: app

d. ios :: ate

Reveal Answer

16. What is the mode for opening a file, in which opening a file fails if file does not exist?

Options:

a. ios::out

b. ios::nocreate

c. ios::noreplace

d. ios::trunk

Reveal Answer

17. Which operator should be used when a file is opened in more than 1 mode?

Options:

a. >> operator

b. << operator

c. || operator

d. | operator

Reveal Answer

18. Which method is used to get the position back from the end of file object?

Options:

a. seekp

b. tellp

c. seekg

d. both a & c

Reveal Answer

19. Which function gives the current location of the get pointer

Options:

a. tellg

b. seekg

c. tellp

d. seekp

Reveal Answer

20. Which part of the file does the put pointer set to when a file is opened in append mode?

Options:

a. At the beginning of the file

b. Anywhere in the file

c. At the end of the file

d. Middle of the file

Reveal Answer

21. What is the output of the following program? #include <iostream> using namespace std; int main () { char first, second; cout << "Enter any two words: "; first = cin.get(); cin.sync(); second = cin.get(); cout << first; cout << second << endl; return 0; }

Options:

a. First letter of the entered first word

b. First letter of the entered second word

c. First letter of entered two words.

d. Compile error

Reveal Answer

22. Which operator is used to reads the data character by character and assigns it to the specified location?

Options:

a. >> operator

b. << operator

c. < operator

d. None of the above

Reveal Answer

23. Which member function returns true at the end of file while reading?

Options:

a. fail()

b. bad()

c. good()

d. eof()

Reveal Answer

24. When does the fail() member function returns true?

Options:

a. At the end of the file while reading

b. If an invalid operation is attempted

c. When an input or output operation has failed.

d. If the file is not good

Reveal Answer

25. Which function is used to reset the error state?

Options:

a. clrscr()

b. clear()

c. clr()

d. reset()

Reveal Answer

Interview Questions and Answer

1. Which of the following is used to read or extracts the data present in the file?

2. For which of the following classes fstream base class acts as a base class?

3. Which of the following function is used to determine whether the stream object is associated with a file?

4. Which class is used to inherit put() function from ostream?

5. Ifstream contains open() with default output mode.

6. Which operator is defined in istream class?

7. What is the unit of data in a stream of Text?

8. Binary stream is used for:

9. Which file supports the character translations?

10. Which header file does not exist in the following list?

11. What is the output of the following program? #include <iostream> using namespace std; int main () { ofstream outfile ("Demo.txt"); for (int n = 0; n < 50; n++) { outfile << n; outfile.flush(); } cout << "Finished"; outfile.close(); return 0; }

12. Which header file is used to create or read data files?

13. Multiple files can be opened by using constructor function of the class.

14. Before opening the files, the filestream object should be ………………….

15. What is the mode for appending the data to the end of file?

16. What is the mode for opening a file, in which opening a file fails if file does not exist?

17. Which operator should be used when a file is opened in more than 1 mode?

18. Which method is used to get the position back from the end of file object?

19. Which function gives the current location of the get pointer

20. Which part of the file does the put pointer set to when a file is opened in append mode?

21. What is the output of the following program? #include <iostream> using namespace std; int main () { char first, second; cout << "Enter any two words: "; first = cin.get(); cin.sync(); second = cin.get(); cout << first; cout << second << endl; return 0; }

22. Which operator is used to reads the data character by character and assigns it to the specified location?

23. Which member function returns true at the end of file while reading?

24. When does the fail() member function returns true?

25. Which function is used to reset the error state?

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