Texas Instruments TI-89 Developer's Guide

484
Appendix A: System Routines — EStack Arithmetic
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
is0
Declaration:
Boolean
is0
(IndexConstQuantum
i
)
Category(ies):
EStack Arithmetic
Description:
Determines whether
i
indexes any tagged big-rational or tagged float zero.
Inputs:
i
— Pointer to an expression.
Outputs:
Returns TRUE if
i
indexes any tagged big-rational or tagged float zero.
Otherwise, returns FALSE.
Assumptions:
i
indexes the top tag of an expression.
Side Effects:
None
Availability:
All versions of the TI
-
89 / TI
-
92 Plus.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: Is_complex0, is1, is_minus1
Example:
push_Float (0.0);
is0(top_estack); /* 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