gm2-libs-iso/SRealIO (The GNU Modula-2 Compiler)

#### 4.4.50 gm2-libs-iso/SRealIO ¶

    DEFINITION MODULE SRealIO;

      (* Input and output of real numbers in decimal text form over
         default channels.  The read result is of the type
         IOConsts.ReadResults.
      *)

      (* The text form of a signed fixed-point real number is
           ["+" | "-"], decimal digit, {decimal digit},
           [".", {decimal digit}]

         The text form of a signed floating-point real number is
           signed fixed-point real number,
           "E", ["+" | "-"], decimal digit, {decimal digit}
      *)

    PROCEDURE ReadReal (VAR real: REAL);
      (* Skips leading spaces, and removes any remaining characters
         from the default input channel that form part of a signed
         fixed or floating point number. The value of this number
         is assigned to real.  The read result is set to the value
         allRight, outOfRange, wrongFormat, endOfLine, or endOfInput.
      *)

    PROCEDURE WriteFloat (real: REAL; sigFigs: CARDINAL; width: CARDINAL);
      (* Writes the value of real to the default output channel in
         floating-point text form, with sigFigs significant figures,
         in a field of the given minimum width.
      *)

    PROCEDURE WriteEng (real: REAL; sigFigs: CARDINAL; width: CARDINAL);
      (* As for WriteFloat, except that the number is scaled with one to
         three digits in the whole number part, and with an exponent that
         is a multiple of three.
      *)

    PROCEDURE WriteFixed (real: REAL; place: INTEGER; width: CARDINAL);
      (* Writes the value of real to the default output channel in
         fixed-point text form, rounded to the given place relative
         to the decimal point, in a field of the given minimum width.
      *)

    PROCEDURE WriteReal (real: REAL; width: CARDINAL);
      (* Writes the value of real to the default output channel, as
         WriteFixed if the sign and magnitude can be shown in the
         given width, or otherwise as WriteFloat. The number of
         places or significant digits depends on the given width.
      *)

    END SRealIO.