What happens when an existing file is opened using the following statement? 

ofstream fout("data.txt");

Options

  • A. The file is opened only for reading
  • B. The existing contents are normally truncated
  • C. The file is always opened in append mode
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

B. The existing contents are normally truncated

Detailed Explanation

Correct Answer: Option B

Explanation:
An ofstream opens a file for output. By default, its output mode normally includes ios::out and truncates an existing file unless a mode such as ios::app changes that behavior. Be careful when opening files containing important data.
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TRE4 C and C++ Quiz practice set 3

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