DEFINITION MODULE SWholeIO;
 
  (* Input and output of whole numbers in decimal text form over default
     channels.  The read result is of the type IOConsts.ReadResults.
  *)
 
  (* The text form of a signed whole number is
       ["+" | "-"], decimal digit, {decimal digit}
 
     The text form of an unsigned whole number is
       decimal digit, {decimal digit}
  *)
 
PROCEDURE ReadInt (VAR int: INTEGER);
  (* Skips leading spaces, and removes any remaining characters from the default input
     channel that form part of a signed whole number.  The value of this number is assigned
     to int.  The read result is set to the value allRight, outOfRange, wrongFormat,
     endOfLine, or endOfInput.
  *)
 
PROCEDURE WriteInt (int: INTEGER; width: CARDINAL);
  (* Writes the value of int to the default output channel in text form, in a field of the
     given minimum width.
  *)
 
PROCEDURE ReadCard (VAR card: CARDINAL);
  (* Skips leading spaces, and removes any remaining characters from the default input
     channel that form part of an unsigned whole number.  The value of this number is
     assigned to card.  The read result is set to the value allRight, outOfRange,
     wrongFormat, endOfLine, or endOfInput.
  *)
 
PROCEDURE WriteCard (card: CARDINAL; width: CARDINAL);
  (* Writes the value of card to the default output channel in text form, in a field of the
     given minimum width.
  *)
 
END SWholeIO.
