Which of the following positions the file pointer for a file that has been opened for reading and writing?
a. Use the size() member function on the file stream to position the file pointer.
b. Use the seekp(arg) fstream member function with the number of records (counting the first record as 0) as argument to position the file pointer.
c. Use the seekp(arg) fstream member function with the number of bytes to the record in question (counting the first byte as 0) as argument to position the file pointer.
d. Use the sizeof operator to determine the number of bytes in the file stream.
Part c) is closest. I would expect my students to supply the fact that he argument must be RecordCount * sizeof(MyStruct) –1 where the –1 accounts for counting bytes from 0 .
Explanation: Part a): there is no size() member of the fstream class. Part b) is almost right but uses record count rather than byte count. Part d) only supplies the size of the stream object, but does nothing to the stream object
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