Is_Nan - Texas Instruments TI-89 Developer's Manual

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Appendix A: System Routines — Direct Floating Point Operations

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.).
f — Float.
Inputs:
Returns TRUE if f represents a NAN. Otherwise returns FALSE.
Outputs:
Assumptions: None
Side Effects: None
On AMS 1.05 and higher.
Availability:
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 */
TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001