What happens when an input file stream attempts to open a nonexistent file using ios::in?
#include <fstream>
#include <iostream>
using namespace std;
int main() {
ifstream file("missing.txt", ios::in);
cout << file.is_open();
return 0;
}
Options
-
A.
It prints 1 in all cases
-
B.
It prints 0 if the file cannot be opened
-
C.
It automatically creates the missing file
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D.
More than one of the above
-
E.
None of the above
Correct Answer (Detailed Explanation is Below)
B.
It prints 0 if the file cannot be opened
Detailed Explanation
Correct Answer: Option BExplanation: If missing.txt does not exist or cannot be opened, the input stream fails to open and is_open() returns false, which is printed as 0. Opening an input file does not normally create a missing file.
