DEFINITION MODULE RealInOut;

  VAR Done: BOOLEAN;

  PROCEDURE ReadReal(VAR x: REAL);
  (* Read a real number "x" according to the syntax:
     
	['+'|'-'] digit {digit} ['.' digit {digit}]
	[('E'|'e') ['+'|'-'] digit {digit}]

     Done := "a number was read".
     Input terminates with a blank or any control character.
     When reading from a terminal, backspacing may be done by either
     DEL or BACKSPACE, depending on the implementation of ReadString.
  *)

  PROCEDURE WriteReal(x: REAL; n: CARDINAL);
  (* Write x using n characters.
     If fewer than n characters are needed, leading blanks are inserted.
  *)

  PROCEDURE WriteRealOct(x: REAL);
  (* Write x in octal words.
  *)
END RealInOut.