Write a C++ code fragment that associates the input stream variable in with the input file data.txt and displays an error message if it is unable to open data.txt for input.
What will be an ideal response?
```
ifstream in( "data.txt", ios::in );
if (in.fail())
cerr << "Unable to open data.txt for input." << endl;
```
Computer Science & Information Technology
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A. use the Control Panel B. use the PC Settings C. use a Paint accessory D. copy and paste a picture to the desktop
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