File Handling in C

1. Which function is used to open a file in C?

A) fopen()
B) fread()
C) fclose()
D) fseek()

Correct Answer: (A) fopen().

2. What is the return type of fopen() function?

A) int
B) FILE*
C) char*
D) void*

Correct Answer: (B) FILE*.

3. Which mode in fopen() is used to open a file for writing at the end of the file?

A) "r"
B) "w"
C) "a"
D) "rw"

Correct Answer: (C) "a".

4. Which function is used to read a single character from a file?

A) getc()
B) putc()
C) fread()
D) fputc()

Correct Answer: (A) getc().

5. What does the fclose() function do in C?

A) Open a file
B) Close a file
C) Read from a file
D) Write to a file

Correct Answer: (B) Close a file.

6. What is the correct syntax for closing a file in C?

A) fclose(file);
B) closefile(file);
C) endfile(file);
D) stopfile(file);

Correct Answer: (A) fclose(file);.

7. What is the function used to get the current position of the file pointer?

A) fseek()
B) ftell()
C) rewind()
D) fgetpos()

Correct Answer: (B) ftell().

8. Which function is used to write formatted data into a file?

A) fprintf()
B) fscanf()
C) fwrite()
D) fread()

Correct Answer: (A) fprintf().

9. What happens if a file opened in "r" mode does not exist?

A) A new file is created
B) fopen() returns NULL
C) fopen() returns 0
D) The program crashes

Correct Answer: (B) fopen() returns NULL.

10. Which function is used to set the position of the file pointer in C?

A) fset()
B) fseek()
C) fmove()
D) fchange()

Correct Answer: (B) fseek().

11. How do you write an integer into a file?

A) fwrite()
B) putw()
C) putc()
D) fprintf()

Correct Answer: (B) putw()

12. Which function is used to read a string from a file in C?

A) gets()
B) fputs()
C) fgets()
D) fscanf()

Correct Answer: (C) fgets()

13. What is the file pointer variable type in C?

A) FILE*
B) int*
C) char*
D) float*

Correct Answer: (A) FILE*

14. What does the rewind() function do in file handling?

A) Moves the file pointer to the end of the file
B) Reverses the contents of the file
C) Moves the file pointer to the beginning of the file
D) Closes the file

Correct Answer: (C) Moves the file pointer to the beginning of the file

15. What is the default mode when a file is opened using fopen()?

A) "r"
B) "w"
C) "a"
D) "rw"

Correct Answer: (A) "r"

16. What is the purpose of the ftell() function in C?

A) To move the file pointer
B) To get the current file position
C) To rewind the file pointer
D) To close the file

Correct Answer: (B) To get the current file position

17. Which function is used to write a character to a file?

A) putc()
B) fwrite()
C) fputc()
D) fprintf()

Correct Answer: (C) fputc()

18. How do you read an integer from a file?

A) getc()
B) fread()
C) getw()
D) fscanf()

Correct Answer: (C) getw()

19. What does the function fseek() do in file handling?

A) Opens a file
B) Reads a file
C) Sets the file pointer to a specific location
D) Closes a file

Correct Answer: (C) Sets the file pointer to a specific location

20. What is the result of opening a file in "w" mode if the file already exists?

A) The file is appended
B) The file is truncated
C) The file is read
D) The file is deleted

Correct Answer: (B) The file is truncated

21. Which function is used to open a file in C?

A) fopen()
B) fget()
C) fset()
D) getopen()

Correct Answer: (A) fopen()

22. What does the 'r' mode in fopen() signify?

A) Read-only mode
B) Write-only mode
C) Append mode
D) Create a new file

Correct Answer: (A) Read-only mode

23. Which function is used to write data to a file in C?

A) fscanf()
B) fwrite()
C) fclose()
D) fputc()

Correct Answer: (B) fwrite()

24. What does the fclose() function do in C?

A) Closes a file
B) Opens a file
C) Reads a file
D) Deletes a file

Correct Answer: (A) Closes a file

25. Which of the following modes does not create a new file if it doesn’t exist?

A) "w"
B) "a"
C) "r"
D) "w+"

Correct Answer: (C) "r"

26. Which function reads a single character from a file?

A) fputc()
B) fgetc()
C) fputs()
D) fprintf()

Correct Answer: (B) fgetc()

27. Which function writes a string to a file in C?

A) fprintf()
B) fscanf()
C) fputs()
D) fwrite()

Correct Answer: (C) fputs()

28. What is the return type of the fopen() function?

A) int
B) FILE*
C) char*
D) void

Correct Answer: (B) FILE*

29. Which function is used to set the position to a specified location in a file?

A) ftell()
B) fseek()
C) fwrite()
D) fread()

Correct Answer: (B) fseek()

30. Which function is used to get the current position in a file?

A) fwrite()
B) fseek()
C) ftell()
D) fputc()

Correct Answer: (C) ftell()

31. What does the 'a' mode in fopen() signify?

A) Read-only mode
B) Write-only mode
C) Append mode
D) Create a new file

Correct Answer: (C) Append mode.

32. Which function can be used to read formatted data from a file?

A) fprintf()
B) fscanf()
C) fputs()
D) fread()

Correct Answer: (B) fscanf().

33. What is the correct way to close a file in C?

A) fclose(fp);
B) close(fp);
C) delete(fp);
D) end(fp);

Correct Answer: (A) fclose(fp);.

34. Which function can be used to write formatted data into a file?

A) fscanf()
B) fprintf()
C) fread()
D) fclose()

Correct Answer: (B) fprintf().

35. In C, what is a file pointer?

A) A pointer to a structure FILE
B) A pointer to the first line in the file
C) A pointer to the memory of a file
D) A pointer to the last line in the file

Correct Answer: (A) A pointer to a structure FILE.

36. Which of the following is not a valid file operation mode?

A) "w+"
B) "r+"
C) "r++"
D) "a+"

Correct Answer: (C) "r++".

37. Which function is used to write integer data into a file?

A) putc()
B) putw()
C) fputs()
D) fwrite()

Correct Answer: (B) putw().

38. How do you check if fopen() failed to open a file?

A) By checking if the pointer returned is NULL
B) By checking if the file size is zero
C) By checking if the file name is empty
D) By checking the file mode

Correct Answer: (A) By checking if the pointer returned is NULL.

39. Which function reads a string from a file?

A) fscanf()
B) fgets()
C) fread()
D) fgetc()

Correct Answer: (B) fgets().

40. What will fopen() return if it fails to open a file?

A) -1
B) NULL
C) 0
D) EOF

Correct Answer: (B) NULL.

41. Which function is used to open a text or binary file in C?

A) fopen()
B) fread()
C) fseek()
D) fputs()

Correct Answer: (A) fopen().

42. Which mode is used to open a binary file for reading?

A) "rb"
B) "wb"
C) "ab"
D) "r"

Correct Answer: (A) "rb".

43. What is the extension used for text files?

A) .bin
B) .text
C) .dat
D) .txt

Correct Answer: (D) .txt.

44. Which of the following is used to open a file in binary mode?

A) "w"
B) "b"
C) "wb"
D) "a"

Correct Answer: (C) "wb".

45. What does the fwrite() function do in C?

A) Write data into a text file
B) Write data into a binary file
C) Write data into a console
D) Write data into a string

Correct Answer: (B) Write data into a binary file.

46. Which function is used to read from a binary file in C?

A) fread()
B) fprintf()
C) fseek()
D) fputs()

Correct Answer: (A) fread().

47. How is data stored in a binary file?

A) In ASCII format
B) In human-readable format
C) In binary format (0s and 1s)
D) In hexadecimal format

Correct Answer: (C) In binary format (0s and 1s).

48. What is the primary difference between text files and binary files?

A) Text files store data as binary while binary files store data as text
B) Text files store data in ASCII format while binary files store data in binary format
C) Text files are only for integers while binary files are for floating points
D) Text files can’t be read by humans but binary files can

Correct Answer: (B) Text files store data in ASCII format while binary files store data in binary format.

49. Which of the following modes can be used to append data to a binary file?

A) "rb"
B) "wb"
C) "ab"
D) "r+"

Correct Answer: (C) "ab".

50. What is the return value of fread() on successful reading?

A) The number of bytes read
B) The number of elements read
C) 0
D) NULL

Correct Answer: (B) The number of elements read.

51. Which function can write data into a binary file?

A) fputc()
B) fwrite()
C) fprintf()
D) fputs()