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518 Appendix A: Functions and Instructions
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 518 of 132
Nest
when()
to define expressions that have
more than two pieces.
TI-89: "
TI-92 Plus:
¥"
ClrGraph
¸
Done
Graph when(x<0,when(x<
ë
p,
4
ù
sin(x),2x+3),5
ì
x^2)
¸
when()
is helpful for defining recursive
functions.
when(n>0,n
ù
factoral(n
ì
1),1)
!
factora
l(
n
)
¸
Done
factora
l(
3
)
¸
6
3
!
¸
6
While
CATALOG
While condition
block
EndWhile
Executes the statements in
block
as long as
condition
is true.
block
can be either a single statement or a
sequence of statements separated with the “:”
character.
Program segment:
©
:
1
!
i
:0
!
temp
:W
h
i
l
e i<=20
: temp+
1/
i
!
temp
: i+
1
!
i
:En
d
W
h
i
l
e
:Disp "sum of reciproca
l
s up to
20",temp
©
“With”
See
|
, page 538.
xor
MATH/Test menu
B
oolean expression1 xor Boolean expression2
⇒
Boolean expression
Returns
true
if
Boolean expression1
is
true
and
Boolean expression2
is false, or vice versa.
Returns
false
if
Boolean expression1
and
Boolean expression2
are both true or both
false. Returns a simplified Boolean
expression if either of the original Boolean
expressions cannot be resolved to true or
false.
Note: See
or
.
true xor true
¸
false
(5>3) xor (3>5)
¸
true