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DEFINITION MODULE LowReal; (* Access to underlying properties of the type REAL *) CONST radix = <implementation-defined whole number value>; places = <implementation-defined whole number value>; expoMin = <implementation-defined whole number value>; expoMax = <implementation-defined whole number value>; large = <implementation-defined real number value>; small = <implementation-defined real number value>; IEC559 = <implementation-defined BOOLEAN value>; LIA1 = <implementation-defined BOOLEAN value>; rounds = <implementation-defined BOOLEAN value>; gUnderflow = <implementation-defined BOOLEAN value>; exception = <implementation-defined BOOLEAN value>; extend = <implementation-defined BOOLEAN value>; nModes = <implementation-defined whole number value>; TYPE Modes = PACKEDSET OF [0 .. nModes-1]; PROCEDURE exponent (x: REAL): INTEGER; (* Returns the exponent value of x *) PROCEDURE fraction (x: REAL): REAL; (* Returns the significand (or significant part) of x *) PROCEDURE sign (x: REAL): REAL; (* Returns the signum of x *) PROCEDURE succ (x: REAL): REAL; (* Returns the next value of the type REAL greater than x *) PROCEDURE ulp (x: REAL): REAL; (* Returns the value of a unit in the last place of x *) PROCEDURE pred (x: REAL): REAL; (* Returns the previous value of the type REAL less than x *) PROCEDURE intpart (x: REAL): REAL; (* Returns the integer part of x *) PROCEDURE fractpart (x: REAL): REAL; (* Returns the fractional part of x *) PROCEDURE scale (x: REAL; n: INTEGER): REAL; (* Returns the value of x * radix ** n *) PROCEDURE trunc (x: REAL; n: INTEGER): REAL; (* Returns the value of the first n places of x *) PROCEDURE round (x: REAL; n: INTEGER): REAL; (* Returns the value of x rounded to the first n places *) PROCEDURE synthesize (expart: INTEGER; frapart: REAL): REAL; (* Returns a value of the type REAL constructed from the given expart and frapart *) PROCEDURE setMode (m: Modes); (* Sets status flags appropriate to the underlying implementation of the type REAL *) PROCEDURE currentMode (): Modes; (* Returns the current status flags in the form set by setMode *) PROCEDURE IsLowException (): BOOLEAN; (* Returns TRUE if the current coroutine is in the exceptional execution state because of the raising of the LowReal exception; otherwise returns FALSE. *) END LowReal. |