To create an input file object, you would use what kind of type? ifstream ofstre

Question

To create an input file object, you would use what kind of type? ifstream ofstream fstream instream What do the following statements accomplish? ifstream theFile; the File.open(myFile.txt, ios::in); Opens myFile in read mode Opens myFile in append mode Creates an empty file named myFile Opens a file in input mode to write to The function used to determine whether an entire sequential access file has been read is called _____ close() function eof() function open() function None of the above Which of the following functions should be used to determine if a file was successfully closed? is_active is_open is_closed is_ready

Explanation / Answer

4. Answer: ifstream
Reason: Data type ifstream represents input file stream i.e this is used to read data from files. Hence to create an Input file object, we should use ifstream.
While fstream represents file stream and can be used to perform both read and write operations on file, ofstream represents output file stream and is used to write data into the file, where as instream is not a valid file stream.

5. Answer: Opens myFile in read mode
Reason: ifstream theFile; // creates an object of input file stream to read data from the file
theFile.open(myFile.txt, ios::in); // opens myFile in input mode
Syntax to open a file is : open (filename, mode); here filename is myFile and mode is ios::in(Open for input operations) therefore second line opens myFile in read mode

6. Answer: eof() function
Reason: eof() function Checks whether eofbit is set and returns true if the eofbit error state flag is set for the stream.This flag gets set by input operations when the End-of-File is reached in the sequence associated with the stream.   

7. Answer: is_open()
Reason: is_open function checks if a file is open and returns whether the stream is currently associated to a file. So, to determine if a file was successfully closed, do is_open() operation. If return value is true, file is open and still associated with the stream object.

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