Texas Instruments Titanium TI-89, User Manual

Page: 592 / 977

Programming 589
Note:
From the keyboard, you can type:
>= for
|
<= for
{
/= for
ƒ
(To get the / character, press
e
.)
Boolean Tests
Boolean operators let you combine the results of two separate tests.
The Not Function
The
not
function changes the result of a test from true to false and vice versa. For
example:
Note:
If you use
not
from the Home screen, it is shown as
~
in the history area. For
example,
not x>2
is shown as
~(x>2)
.
Operator True if: Example
and Both tests are true
a>0 and a { 10
or At least one test is true
a { 0 or b+c>10
xor One test is true and the
other is false a+6<b+1 xor c<d
not
x>2
is true if
is false if
x
{
2
x>2