Slide 2.7: Seeking Slide 2.9: The Unix Home

Seeking (Cont.)

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• void open( const char * filename, openmode mode = ios_base::in | ios_base::out );
  This program applies update operations, which are neither read nor write. For update, the openmode is in or out.


• streampos tellp( );
  It is a method inherited from ostream and returns the position of put pointer, which determines the next location where to write in the buffer associated to the output stream.


• streampos tellg( );
  It is a method inherited from istream and returns the position of the get pointer. The get pointer determines the next location to be read in the buffer associated to the input stream.


• ostream& seekp( streampos pos );
  It is a method inherited from ostream and sets the position of the put pointer. The put pointer determines the next location where to write in the buffer associated to the output stream.


• istream& seekg( streampos pos );
  It is a method inherited from istream and sets the position of the get pointer, which determines the next location to be read in the buffer associated to the input stream.


• ostream& write( const char* str, streamsize n );
  It is a method inherited from ostream and writes a sequence of characters. Inserts into the output stream a sequence of characters starting by character pointed by str and following by successive characters in the array until the number of characters specified by n has been successfully written or until an error occurs in the output sequence. No check for ending null characters is done.