Lesson 2.4: Combine Rules with And, Or, and Not

Boolean operators combine or change conditions.

• and is true only when both conditions are true.
• or is true when at least one condition is true.
• not changes true to false and false to true.

The condition weight < 10 and ready = true requires both rules. The condition color = red or color = blue accepts either listed color.

Keep combined rules readable. If a condition becomes hard to explain, store part of it in a clearly named Boolean variable, such as correctSize.

Guided practice

Set weight to 8 and labelReady to true. Print the result of weight < 10 and labelReady. Test again with weight 12, then with labelReady false.

Build a second condition that accepts a package when its code is A or B. Use not to print whether a package is not accepted. Make a truth table with your inputs and outputs before running the tests.

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