#include <cstdio>
  int fseek( FILE *stream, long offset, int origin );

The function fseek() sets the file position data for the given stream. The origin value should have one of the following values (defined in cstdio):

Name	Explanation
SEEK_SET	Seek from the start of the file
SEEK_CUR	Seek from the current location
SEEK_END	Seek from the end of the file

fseek() returns zero upon success, non-zero on failure. You can use fseek() to move beyond a file, but not before the beginning. Using fseek() clears the EOF flag associated with that stream.