Manipulators are supplied to let executing programs insert values into or
  extract values from a stream to cause some special effect as follows:

  ios &dec(ios &s)	     Sets the conversion base format to decimal.
  ios &hex(ios &s)	     Sets the conversion base format to hexadecimal.
  ios &oct(ios &s)	     Sets the conversion base format to octal.
  ios &lock(ios &s)           Locks a predefined object
  ios &unlock(ios &s)         Unlcks a predefined object
  istream &ws(istream &i)     Extracts (skips) white-space characters.
  ostream &endl(ostream &o)   Ends a line by inserting a new-line character and
 				flushing.
  ostream &ends(ostream &o)   Ends a string by inserting a null (0) character.
  ostream &flush(ostream &o)  Flushes ostreams.