File Handling in C++ – MCQs

1. : What header file is used for file handling in C++?
2. : Which class is used to write to a file in C++?
(A) ifstream
(B) ofstream
(C) fstream
(D) filewriter

3. : Which class is used to read from a file in C++?
(A) ifstream
(B) ofstream
(C) fstream
(D) fileReader

4. : Which class allows both reading and writing to a file in C++?
(A) ifstream
(B) fstream
(C) ofstream
(D) iostream

5. : What function is used to open a file?
(A) start()
(B) open()
(C) load()
(D) begin()

6. : Which function checks whether a file is open?
(A) check()
(B) fileopen()
(C) is_open()
(D) open_status()

7. : Which mode opens a file for reading only?
(A) ios::out
(B) ios::in
(C) ios::app
(D) ios::ate

8. : Which mode opens a file for appending data at the end?
(A) ios::out
(B) ios::in
(C) ios::app
(D) ios::trunc

9. : Which mode truncates the file to zero length if it exists?
(A) ios::in
(B) ios::out
(C) ios::trunc
(D) ios::binary

10. : Which mode is used for binary file operations?
(A) ios::in
(B) ios::out
(C) ios::binary
(D) ios::app

11. : What is the default mode for ofstream?
(A) ios::in
(B) ios::out
(C) ios::app
(D) ios::binary

12. : What happens if a file cannot be opened?
(A) The program terminates
(B) A new file is created
(C) is_open() returns false
(D) Data is lost

13. : What function is used to write to a file?
(A) read()
(B) input()
(C) write()
(D) <<

14. : What function is used to read from a file?
15. : What is the purpose of eof() function?
(A) To open a file
(B) To detect end of file
(C) To format the file
(D) To save the file

16. : What is the full form of EOF?
(A) End of Field
(B) Error of File
(C) End of File
(D) End of Format

17. : What does getline() do?
(A) Reads the entire file
(B) Reads a line of text from the file
(C) Writes a line to the file
(D) Gets a character from the file

18. : Which function closes a file?
(A) exit()
(B) close()
(C) end()
(D) stop()

19. : Which stream is used for both input and output?
(A) ifstream
(B) ofstream
(C) iostream
(D) fstream

20. : What happens if you try to read from a file that does not exist?
(A) File is created
(B) Error occurs
(C) Blank output
(D) File is renamed

21. : What happens if you write to a file opened in ios::in mode?
(A) Success
(B) Compile error
(C) Runtime error
(D) Nothing happens

22. : Which operator is overloaded in C++ for file I/O?
(A) ==
(B) >> and <<
(C) +
(D) ->

23. : Which data type is used for file pointers in C++?
(A) char*
(B) ifstream
(C) fstream
(D) file*

24. : What is the purpose of seekg()?
(A) Sets output position
(B) Reads data
(C) Moves the get pointer
(D) Deletes data

25. : What does tellg() return?
(A) File size
(B) Write position
(C) Read position
(D) File name

26. : What is the default file mode for ifstream?
(A) ios::out
(B) ios::in
(C) ios::app
(D) ios::trunc

27. : What happens when ofstream opens a file that already exists?
(A) Appends to file
(B) Deletes and creates a new file
(C) Renames the file
(D) Throws error

28. : Which function is used to skip whitespaces while reading?
(A) getline()
(B) skipws
(C) noskipws
(D) clear()

29. : Which file mode ensures the file is not deleted when opened?
(A) ios::out
(B) ios::trunc
(C) ios::app
(D) ios::ate

30. : Which C++ stream handles errors related to file I/O?
(A) cerr
(B) cout
(C) clog
(D) cin