Texas Instruments TI-89 Developer's Guide

416
Appendix A: System Routines — Direct Floating Point Operations
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
is_nan
Declaration:
Boolean
is_nan
(Float
f
)
Category(ies):
Direct Floating Point Operations
Description:
Determines whether
f
represents a NAN (this is an undefined float, such as
0./0.).
Inputs:
f
— Float.
Outputs:
Returns TRUE if
f
represents a NAN. Otherwise returns FALSE.
Assumptions:
None
Side Effects:
None
Availability:
On AMS 1.05 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: is_float_signed_infinity, is_float_infinity,
is_float_unsigned_inf_or_nan, is_float_transfinite
Examples:
is_nan (0.0/0.0); /* Returns TRUE */

Texas Instruments TI-89 Specifications

General

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA