Texas Instruments TI-89 Developer's Guide

522
Appendix A: System Routines — EStack Utilities
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
estack_to_short
Declaration:
short
estack_to_short
(EStackIndex
i
, signed short *
result
)
Category(ies):
EStack Utilities, EStack Arithmetic
Description:
Converts a tagged whole number to a C signed short.
Inputs:
i
— Index of the tag of a tagged integer or tagged float whole
number.
result
— Points to a signed short for storing the short result.
Outputs:
If successful, returns 1 after storing the signed short value in
result
. If the
argument is a valid type having magnitude too large for a signed short,
returns 0 after storing the correctly signed
L
32768 or 32767 in
result
. If the
argument is invalid, returns
L
1 after storing 0 in
result
.
Assumptions:
None
Side Effects:
None
Availability:
On AMS 1.05 and higher.
TI
-
89 / TI
-
92 Plus
Differences:
None
See Also: estack_to_ushort, estack_to_float, estack_number_to_Float
Example:
push_quantum_as_nonnegative_int (5u);
estack_to_short(top_estack, &ans); /* Stores 5 in ans then returns 1 */
push_ushort_to_integer (65535);
estack_to_short(top_estack, &ans); /* Stores 32767 in ans then returns 0 */
estack_to_short(FloatPiIndex, &ans); /* Stores 0 in ans then returns –1 */

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