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

#### 4.4.41 gm2-libs-iso/RealConv ¶

    DEFINITION MODULE RealConv;

      (* Low-level REAL/string conversions *)

    IMPORT
      ConvTypes;

    TYPE
      (* strAllRight, strOutOfRange, strWrongFormat, strEmpty *)
      ConvResults = ConvTypes.ConvResults;

    PROCEDURE ScanReal (inputCh: CHAR; VAR chClass: ConvTypes.ScanClass;
                        VAR nextState: ConvTypes.ScanState);
      (* Represents the start state of a finite state scanner for real
         numbers - assigns class of inputCh to chClass and a procedure
         representing the next state to nextState.
       *)

    PROCEDURE FormatReal (str: ARRAY OF CHAR): ConvResults;
      (* Returns the format of the string value for conversion to REAL. *)

    PROCEDURE ValueReal (str: ARRAY OF CHAR): REAL;
      (* Returns the value corresponding to the real number string value
         str if str is well-formed; otherwise raises the RealConv
         exception.
      *)

    PROCEDURE LengthFloatReal (real: REAL; sigFigs: CARDINAL): CARDINAL;
      (* Returns the number of characters in the floating-point string
         representation of real with sigFigs significant figures.
      *)

    PROCEDURE LengthEngReal (real: REAL; sigFigs: CARDINAL): CARDINAL;
      (* Returns the number of characters in the floating-point engineering
         string representation of real with sigFigs significant figures.
      *)

    PROCEDURE LengthFixedReal (real: REAL; place: INTEGER): CARDINAL;
      (* Returns the number of characters in the fixed-point string
         representation of real rounded to the given place relative to the
         decimal point.
      *)

    PROCEDURE IsRConvException (): BOOLEAN;
      (* Returns TRUE if the current coroutine is in the exceptional
         execution state because of the raising of an exception in a
         routine from this module; otherwise returns FALSE.
      *)

    END RealConv.