Solution

The correct answer is A-I, B-III, C-IV, D-II.

Key Points

• A. ios::ate → I
  • Opens file and moves the file pointer to the end of file immediately.
• B. ios::in → III
  • Opens file in read-only mode.
• C. ios::nocreate → IV
  • Opening fails if the file does not exist.
• D. ios::noreplace → II
  • Opening fails if the file already exists.

Additional Information

• C++ File Modes Summary:
  • ios::in → read mode.
  • ios::out → write mode.
  • ios::ate → pointer at end.
  • ios::nocreate → fail if file missing.
  • ios::noreplace → fail if file exists.