Streams

Random Access

The follow calls move the get and put positions to character n counted from the beginning of the file fs.
```
fs.seekg(n, ios::beg);
fs.seekp(n, ios::beg);
```
The second argument can be ios:end or ios::cur to move the position n characters away from the end of the file or the current position, respectively.
To determine the current position of the get and put positions (counted from the beginning of the file), use
```
n = fs.tellg();
n = fs.tellp();
```
Because the files can be very larger, the positions are long integers.
To find out the number of characters in a file, move the get position to the end and then find out the distance from the beginning of the file.
```
fs.seekg(0, ios::end);
long file_length = fs.tellg();
```