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realstr.def
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1996-08-29
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DEFINITION MODULE RealStr;
(* REAL/string conversions *)
IMPORT
ConvTypes;
TYPE
ConvResults = ConvTypes.ConvResults;
(* strAllRight, strOutOfRange, strWrongFormat, strEmpty *)
(*
* the string form of a signed fixed-point real number is
* ["+" | "-"], decimal digit, {decimal digit}, [".", {decimal digit}]
*)
(*
* the string form of a signed floating-point real number is
* signed fixed-point real number, "E", ["+" | "-"], decimal digit, {decimal digit}
*)
PROCEDURE StrToReal (str: ARRAY OF CHAR; VAR real: REAL; VAR res: ConvResults);
(*
* Ignores any leading spaces in str. If the subsequent characters in str are in the
* format of a signed real number, assigns a corresponding value to real.
* Assigns a value indicating the format of str to res.
*)
PROCEDURE RealToFloat (real: REAL; sigFigs: CARDINAL; VAR str: ARRAY OF CHAR);
(*
* Converts the value of real to floating-point string form, with sigFigs significant
* figures, and copies the possibly truncated result to str.
*)
PROCEDURE RealToEng (real: REAL; sigFigs: CARDINAL; VAR str: ARRAY OF CHAR);
(*
* Converts the value of real to floating-point string form, with sigFigs significant
* figures, and copies the possibly truncated result to str.
* 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 RealToFixed (real: REAL; place: INTEGER; VAR str: ARRAY OF CHAR);
(*
* Converts the value of real to fixed-point string form, rounded to the given place
* relative to the decimal point, and copies the possibly truncated result to str.
*)
PROCEDURE RealToStr (real: REAL; VAR str: ARRAY OF CHAR);
(*
* Converts the value of real as RealToFixed if the sign and magnitude can be shown
* within the capacity of str, or otherwise as RealToFloat, and copies the possibly
* truncated result to str. The number of places or significant digits are
* implementation-defined.
*)
END RealStr.