**A. Notes**

In the computer, we use

**1**to representand*true***0**to represent.*false*We need to use

and*true*to check facts such as if 100 is greater than 40*false*We also need

,*and*, as well as*or*to connect multiple facts such as "if 100 is greater than 40*not*today is the Easter Sunday"*or*We call

and*true*boolean values. We call*false*boolean operators.*and, or, not*If we mix boolean values and boolean operators together, we get boolean expressions.

1

0

false

true

false

false

true

false

true

true

false

true

false

true

false

false

false

true

false