13.3.2. File Pointers

Try these first

1. 1.

   What function is used to set the position of the get pointer?

   Hint

   It starts with 's' and is related to getting!

2. 2.

   Which function retrieves the current position of the put pointer?

   Hint

   It tells you where you've last written!

3. 3.

   What is seekg() used for?

   • Setting the write position
   • Setting the read position
   • Getting the current position

   Hint

   Remember which pointer deals with reading!

4. 4.

   Which of the following functions retrieves the current position of the get pointer?

   • tellg()
   • tellp()
   • seekp()

   Hint

   Think about which function begins with 't' for telling!

5. 5.

   Write a program that opens a file, seeks to the end, writes data, and then goes back to the beginning to read it back.

   Hint

   Don't forget to open the file in the correct mode!

6. 6.

   Explain the implications of calling tellg() directly after a seekp() operation.

   Hint

   Consider what happens to file pointers when you write before reading.