The ___ member function moves a file's write position to a specified byte in the file.

Whenever we read or write data from/to a file, the position of the file changes. The position refers to the index of the last byte that was accessed. In order to navigate through the file and work on different parts of it, we need a way to change the file's position.

The member function we are discussing is used to move the write position of a file to a specific byte. This is useful when you want to edit specific parts of the file without changing the rest of the content. You simply call this function with the desired byte index as an argument to move the write position to that location.

The syntax for using this member function to move the file's write position to a specific byte is: ```cpp file_stream_object.seekp(position); ``` Here, 'file_stream_object' refers to the file stream object you are using to work with the file, and 'position' is the byte index where the write position will be moved to.

Let's consider an example where we have a file named "example.txt" containing the text "Welcome to the world of programming!". We want to change the word "world" to "zone." Here's how we can do it: 1. Open the file in read and write mode: ```cpp std::fstream file("example.txt", std::ios::in | std::ios::out); ``` 2. Move the write position to the byte where the word "world" starts: ```cpp file.seekp(11); // The word "world" starts at byte index 11 ``` 3. Write the new word, "zone," at the current write position: ```cpp file << "zone"; ``` 4. Close the file: ```cpp file.close(); ``` By following these steps, the file "example.txt" will now contain the text "Welcome to the zone of programming!", with "zone" replacing "world."