1. Intro CS – Logic & Operators Lesson Plan 5

2. Goals  Students can explain basic logical operators  AND, OR, NOT  Students can create truth tables for the operators  Students can explain when logic operators are needed  Students can choose appropriate logic operators for a situation  Students can evaluate given logic expressions  Students can write logic expressions

3. Objectives  Students are introduced to logic operators to combine tests, typically used in IF statements  Students are given real problems to code and solve using IF blocks and logic operators  Results are demonstrated through demos of running code and displayed results

4. Pre Requisites  Knowledge of IF blocks  Basic Understanding of BYOB

5. Materials  Slides with examples (or present on whiteboard)  PCs with development environments installed

6. Lesson Description  Students learn to define basic logic operators  Students apply the logic operators to given problems  Students practice and extend examples  Students present their solutions, typically F2F with the instructor(s) at their desk  Students analyze their and others’ solutions for bugs

7. Lesson Procedure  Quick review of IF blocks  Introduce logic operators through student investigation  Give exercises for in class practice  Walk the room answering questions, looking over the shoulder, asking questions, etc.  Review

8. Closure/Conclusion  Summary  IF blocks help you make decisions, and take action if TRUE  Logic operators can be added anywhere a true/false test is used (If, If/Else, Repeat until, Wait until)  Ask questions on what is confusing or needs more time/practice

9. Logic Operators Lesson Plan 5

10. Review: IF blocks  What are IF Blocks?  IF blocks are used to help make decisions and branch your code.  When the IF Block statement is true, whatever is contained inside the decision block is done  Other blocks that use logic: IF/ELSE, Repeat Until, Wait Until

11. Combining Logic 0 Sometimes we need to take multiple pieces of information in, and make decisions 0 This information can be combined in many ways 0 Examples: 0 If I get my homework done, AND I walk the dog, OR my Mom’s NOT home, THEN I can play video games after school 0 If I play video games before my homework is done AND before I walk the dog, AND my Mom comes home, THEN I can’t play video games for a week

12. Investigation 0 Pair up. If you get stuck, ask another pair. 0 Investigate and write down on paper or in online notes: 0 Define and explain AND, OR, NOT as they relate to programming/computer science 0 What is a Truth Table? 0 Find and recreate the truth tables for AND, OR, NOT 0 Write a combined logic example using AND, OR, and NOT (all in one IF statement) using Snap

13. When to use 0 AND 0 When both things tested are true, then do something 0 Who can give an example from a project we’ve done? 0 OR 0 When either thing tested is true, then do something 0 Who can give an example from a project we’ve done 0 NOT 0 Take the opposite of whatever is being tested 0 Who can give an example from a project we’ve done

14. Example  Cheese Puff Girl, version 2.0  If Cheese Puff Girl is touching the Cheetos, AND the mouse is down OR the Space key is pressed AND the variable OnStartScreen is NOT true, THEN Hide/respawn the Cheetos Bump the score by one

15. Practice Evaluating 0 (1 4)=? 0 Count=3 NOT (Count>3)=? 0 X position = 100, Y position = 50 ((X>90) AND (X 90) AND (X 40))=?

16. Practice creating 0 Write an expression to determine the following: 0 Whether the X position of a sprite is bigger than 200 0 Whether a variable INPUT is not between 5 and 10 0 Whether two variables, X and Y, are not equal to each other 0 Whether at least $1.25 has been added to the machine, and the person has pressed the button for Snapple Lemon Tea

17. Practice 0 Which value for x will make the statement below true? ( x > 0 ) AND ( x < 4 ) 0 Which value for x will make the statement below true? ( x > 0 ) OR ( x < 0 )

18. Tough Practice 0 Which truth table represents the statement:

19. Congrats 0 You’ve just learned the basics of Boolean algebra (but there’s much more to learn in advanced classes) 0 Boolean means True/False, On/Off, etc. 0 We can combine tests for True/False with AND/OR/NOT 0 Truth tables show us the output for given inputs