Floating-Point Inquiry and Control Procedures: table

Note: Certain functions (EXPONENT, FRACTION, NEAREST, RRSPACING, SCALE, SET_EXPONENT and SPACING) return values related to components of the model set of real numbers. For a description of this model, see the Model for Real Data.

Name	Procedure Type	Description	Argument/Function Type
DIGITS	Intrinsic Function	DIGITS(x). Returns number of significant digits for data of the same type as x.	x: Integer or Real result: Integer
EPSILON	Intrinsic Function	EPSILON(x). Returns the smallest positive number that when added to one produces a number greater than one for data of the same type as x.	x: Real result: same type as x
EXPONENT	Intrinsic Function	EXPONENT(x). Returns the exponent part of the representation of x.	x: Real result: Integer
FRACTION	Intrinsic Function	FRACTION(x). Returns the fractional part of the representation of x.	x: Real result: same type as x
GETCONTROLFPQQ¹	Run-time Subroutine	GETCONTROLFPQQ(control). Returns the value of the floating-point processor control word.	control: INTEGER(2)
GETSTATUSFPQQ¹	Run-time Subroutine	GETSTATUSFPQQ(status). Returns the value of the floating-point processor status word.	status: INTEGER(2)
HUGE	Intrinsic Function	HUGE(x). Returns largest number that can be represented by data of type x.	x: Integer or Real result: same type as x
LCWRQQ¹	Run-time Subroutine	Same as SETCONTROLFPQQ.
MAXEXPONENT	Intrinsic Function	MAXEXPONENT(x). Returns the largest positive decimal exponent for data of the same type as x.	x: Real result: INTEGER(4)
MINEXPONENT	Intrinsic Function	MINEXPONENT(x). Returns the largest negative decimal exponent for data of the same type as x.	x: Real result: INTEGER(4)
NEAREST	Intrinsic Function	NEAREST(x, s). Returns the nearest different machine representable number to x in the direction of the sign of s.	x: Real s: Real and not zero result: same type as x
PRECISION	Intrinsic Function	PRECISION(x). Returns the number of significant digits for data of the same type as x.	x: Real or Complex result: INTEGER(4)
RADIX	Intrinsic Function	RADIX(x). Returns the base for data of the same type as x.	x: Integer or Real result: INTEGER(4)
RANGE	Intrinsic Function	RANGE(x). Returns the decimal exponent range for data of the same type as x.	x: Integer, Real or Complex result: INTEGER(4)
RRSPACING	Intrinsic Function	RRSPACING(x). Returns the reciprocal of the relative spacing of numbers near x.	x: Real result: same type as x
SCALE	Intrinsic Function	SCALE(x, i). Multiplies x by 2 raised to the power of i.	x: Real i: Integer result: same type as x
SCWRQQ¹	Run-time Subroutine	Same as GETCONTROLFPQQ.
SETCONTROLFPQQ¹	Run-time Subroutine	SETCONTROLFPQQ (controlword). Sets the value of the floating-point processor control word.	controlword: INTEGER(2)
SET_EXPONENT	Intrinsic Function	SET_EXPONENT(x, i). Returns a number whose fractional part is x and whose exponential part is i.	x: Real i: Integer result: same type as x
SPACING	Intrinsic Function	SPACING(x). Returns the absolute spacing of numbers near x.	x: Real result: same type as x
SSWRQQ¹	Run-time Subroutine	Same as GETSTATUSFPQQ.
TINY	Intrinsic Function	TINY(x). Returns smallest positive number that can be represented by data of type x.	x: Real result: same type as x
¹ ia32 only