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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

Similar Questions :

1. Which stream class is to only read from files ?

  • ofstream
  • ifstream
  • fstream
  • iostream

Answer: Option B

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

  • True
  • False

Answer: Option A

3. Which among following is correct syntax of closing a file in c++ ?

  • myfile$close();
  • myfile@close();
  • myfile:close();
  • myfile.close();

Answer: Option D

4. Which is correct syntax for, position n bytes back from end of fileObject ?

  • fileObject.seekg(ios::end, n);
  • fileObject.seekg(n, ios:end );
  • fileObject.seekg(n, ios::end );
  • fileObject.seekg(ios:end, n);

Answer: Option C

5. How to find the position at end of fileObject ?

  • fileObject.seekg( 0, ios::end );
  • fileObject.seekg( 0, ios::end );
  • fileObject.seekg( 0, ios::end );
  • fileObject.seekg( 0, ios::end );

Answer: Option A

Read more from - C++ File Handling Questions Answers
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