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
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