Boolean Expressions: true or false

Module 12: Boolean Expressions: true or false

Sometimes a programmer would like one statement, or group of statements to execute only if certain conditions are true. There may be a different statement, or group of statements that are to be executed when the condition is false. An expression that can be evaluated to true or false is called a Boolean expression. (Named after a mathematician named Boole who developed Boolean algebra.)

Goals:

• Use Boolean expressions to make comparisons;
• Use the if/else control structure to create different paths or branches in the code;
• Perform tasks such as asking the user a question and tell if the answer is right;
• Gain a deeper understanding of objects in the Alice virtual world.

Objectives:

• Write code to input answers of various types from the user;
• Apply if/else control structures to tell the user if his answer is right or wrong;
• Implement a counter to display the score at the end;
• Use the function getBooleanFromUser to get true or false answers;
• Write code to compare values and take appropriate actions;
• Be able to use AND and OR in Boolean expressions;
• Use the function getHeight to find the taller of two animals.

Print the lesson

Please study the material at each of the links below.

1. Ask if it is nighttime: The function getBooleanFromUser gives a choice of true or false.
2. Using Boolean Expressions in If Block: Ask if Thor is happy, he says ha-ha or boo-hoo
3. Pass or Fail: Compare a score to 65 and say "Pass" or "Fail"
4. Child or Adult? Comparing values: Compare age to determine if child or adult
5. Restaurant? Using AND: &&: Need restaurant with hamburgers and pizza
6. Teenager? Using AND: &&: You are a teenager if age >=13 AND age <= 19
7. discount? Using OR: ||: Children and Seniors pay $10 admission. Everyone else pays $15
8. Panda says "Whee!" if turning fast: Panda says "Whee" if amountToTurn > 2.0
9. Who is taller? Compare height of 2: Use the function getHeight to find the taller of two animals
10. A Quiz Game: This video shows how to create a quiz and keep track of number right.
11. A True/False Question: Using if to tell the user the answer is right.
12. A drill on Boolean values: See if you can do these comparisons
13. The user is offered coffee and tea: See if you can add another choice
14. The seagull asks how many penguins there are.: See if you can add to this project
15. Self Study Questions: What have you learned?
16. Active Learning: A Quiz Game: Show what have you learned
17. Complete Step 5: Interactions for the final project.
18. Discussion questions: What do you think?

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