Question Detail

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.

1. Calling the stream's member function sync() causes an immediate synchronization.

True
False

Answer: Option A

2. 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

3. What is use of eof() ?

Returns true if a file open for reading has reached the next character.
Returns true if a file open for reading has reached the next word.
Returns true if a file open for reading has reached the end.
Returns true if a file open for reading has reached the middle.

Answer: Option C

4. 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