Discussion
Which of the following mode declaration is used in C++ to open a file for input ?
Answer: D
The mode ios::in is used in C++ to open a file for input (reading). It is passed to the open function of the file stream, as in ifstream.open(name, ios::in).
ios::app opens a file for output in append mode. 'in::ios' reverses the class and the mode and is not valid, and ios::file is not a file mode. So only ios::in is right.
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