Texas Instruments TI-89 Manual De Usuario

Programming

605

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

{

At least one test is true

{

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