Question Detail

ios::trunc is used for ?

If the file is opened for output operations and it already existed, no action is taken.
If the file is opened for output operations and it already existed, its previous content is deleted and replaced by the new one.
If the file is opened for output operations and it already existed, then a new copy is created.
None of above

Answer: Option B

1. Which stream class is used to both read and write on files ?

ofstream
ifstream
fstream
iostream

Answer: Option C

2. Which among is used for positioning relative to the beginning of a stream ?

ios::start
ios::beg
ios::begin
ios::beginning

Answer: Option B

3. Which among following is used to open a file in binary mode ?

ios:app
ios::out
ios::in
ios::binary

Answer: Option D

Explanation:

ios:app -> All output operations are performed at the end of the file, appending the content to the current content of the file.

ios::out -> Open for output operations.

ios::in -> Open for input operations.

4. Which is among following is used to Open a file for output and move the read/write control to the end of the file ?

ios::ate
ios::at
ios::ann
ios::end

Answer: Option A

5. How to get position n bytes forward in fileObject ?

fileObject.seekg( ios::cur, n );
fileObject.seekg( n, ios:cur );
fileObject.seekg( n, ios::cur );
fileObject.seekg( ios:cur, n );

Answer: Option C