When used by itself, the ios::app flag causes the file's existing contents to be deleted if the file already exists.

Name: When used by itself, the ios::app flag causes the file's existing contents to be deleted if the file already exists.
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Quizplus · Accepted Answer

When used by itself, the ios::app flag does not cause the file's existing contents to be deleted if the file already exists. Instead, new data is appended to the end of the existing file.

When Used by Itself, the Ios::app Flag Causes the File's