Question Detail

Which is correct syntax ?

myfile:open ("example.bin", ios::out);
myfile.open ("example.bin", ios::out);
myfile::open ("example.bin", ios::out);
myfile.open ("example.bin", ios:out);

Answer: Option B

1. 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

2. How to get position to the nth byte of fileObject ?

fileObject.seekg( 'filename',n );
fileObject.seekg( n, 'filename' );
fileObject.seekg( n );
fileObject.seekg( n, ios::app );

Answer: Option C

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

ofstream
ifstream
fstream
iostream

Answer: Option C

5. Which stream class is to only write on files ?

ofstream
ifstream
fstream
iostream

Answer: Option A