Texas Instruments TI-89 Developer's Guide

424
Appendix A: System Routines — Direct Floating Point Operations
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
round12_err
Declaration:
BCD16
round12_err
(BCD16
fNum
, short
errCode
)
Category(ies):
Direct Floating Point Operations
Description:
Verify that a BCD16 value,
fNum
, is in the valid user range for floating point
values. This routine will round to 12 digits and underflow to zero if the
exponent is < -999. If the number is NAN or the exponent is > 999, then it
will throw the error code passed in
errCode
.
Inputs:
fNum
— Floating point number to check and round.
errCode
— Error to throw if number passed is not a number or its
exponent is greater than 999.
Outputs:
The value of
fNum
rounded to 12 digits of precision.
Assumptions:
None
Side Effects:
May throw the error code passed in
errCode
.
Availability:
All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences:
None
See Also: round12, round14,
ER_throw
(continued)

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