What does the following C++ program do to an existing file named data.txt?
#include <fstream>
using namespace std;
int main() {
ofstream file("data.txt", ios::out | ios::trunc);
file.close();
return 0;
}
Options
-
A.
It preserves all existing contents
-
B.
It deletes the file permanently
-
C.
It opens the file for reading only
-
D.
More than one of the above
-
E.
None of the above
Correct Answer (Detailed Explanation is Below)
E.
None of the above
Detailed Explanation
Correct Answer: Option E — None of the aboveExplanation: If opening succeeds and data.txt already exists, ios::out | ios::trunc opens it for output and truncates its contents to zero length. The file itself is not permanently deleted. If it does not exist, it is normally created.
