Texas Instruments TI-89 Manual Book page 535

Nest
when()
more than two pieces.
when() is helpful for defining recursive
functions.
While
CATALOG
While condition
block
EndWhile
Executes the statements in
condition
can be either a single statement or a
block
sequence of statements separated with the ":"
character.
"With" |
See , page 538.
xor
MATH/Test menu
Boolean expression1 xor Boolean expression2
Boolean expression
Returns
Boolean expression2
Returns
Boolean expression2
false. Returns a simplified Boolean
expression if either of the original Boolean
expressions cannot be resolved to true or
false.
Note: See
518 Appendix A: Functions and Instructions
to define expressions that have
as long as
block
is true.
if
true
Boolean expression1
is false, or vice versa.
if
false Boolean expression1
are both true or both
.
or
"
TI-89:
TI-92 Plus:
ClrGraph ¸
Graph when(x<0,when(x<ë p,
4ù sin(x),2x+3),5ì x^2) ¸
when(n>0,nù factoral(nì 1),1)
! factoral(n) ¸
factoral(3) ¸
3! ¸
Program segment:
©
:1! i
:0! temp
:While i<=20
: temp+1/i! temp
: i+1! i
:EndWhile
:Disp "sum of reciprocals up to
20",temp
©
true xor true ¸
(5>3) xor (3>5) ¸
is and
true
and
¥ "
Done
Done
6
6
false
true