Complex Conditionals

Summary

Materials

• Day 5 PowerPoint deck
• Hungry
• Hungry Mod (for teacher)
• NOT Left (for teacher)
• Quadrants (for teacher)
• Boolean Statements and Expressions handout
• Boolean Statements and Expressions handout in Word
• Activity: Boolean Statements and Expressions

Reference

• Boolean

Instructional Activities and Classroom Assessments

1. Boolean Refresher (5 minutes)
2. Using Booleans (20 minutes)
3. Boolean Practice (25 minutes)
4. Reflection/Homework

Learning Objectives

• AAP-2.E For relationships between two variables, expressions, or values:
  • a. Write expressions using relational operators. 2.B
  • b. Evaluate expressions that use relation operators. 4.B
• AAP-2.F For relationships between Boolean values:
  • a. Write expressions using logical operators. 2.B
  • b. Evaluate expressions that use logic operators. 4.B
• AAP-2.H For selection:
  • a. Write conditional statements. 2.B
  • b. Determine the result of conditional statements.  4.B
• AAP-2.I For nested selection:
  • a. Write nested conditional statements. 2.B
  • b. Determine the result of nested conditional statements. 4.B

Essential Knowledge

• AAP-2.E.1 A Boolean value is either true or false.

• AAP-2.E.2 The exam reference sheet provides the following relational operators: =, ≠, >, <, ≥, and ≤. Text and Block:
  § a = b
  § a ≠ b
  § a > b
  § a < b
  § a ≥ b
  § a ≤ b
  These are used to test the relationship between two variables, expressions, or values. A comparison using a relational operator evaluates to a Boolean value. For example, a = b evaluates to true if a and b are equal; otherwise, it evaluates to false.

• AAP-2.F.1 The exam reference sheet provides the logical operators NOT, AND, and OR, which evaluate to a Boolean value.

• AAP-2.F.2 The exam reference sheet provides Text: NOT condition Block: NOT condition which evaluates to true if condition is false; otherwise it evaluates to false.

• AAP-2.F.3 The exam reference sheet provides Text: condition1 AND condition2 Block: condition1 AND condition2 which evaluates to true if both condition1 and condition2 are true; otherwise it evaluates to false.

• AAP-2.F.4 The exam reference sheet provides Text: condition1 OR condition2 Block: condition1 OR condition2 which evaluates to true if condition1 is true or if condition2 is true or if both condition1 and condition2 are true; otherwise it evaluates to false.

• AAP-2.F.5 The operand for a logical operator is either a Boolean expression or a single Boolean value.

• AAP-2.H.1 Conditional statements, or "if-statements," affect the sequential flow of control by executing different statements based on the value of a Boolean expression.

• AAP-2.H.2 The exam reference sheet provides

  • Text: IF(condition) { <block of statements> }
  • Block: IF condition block of statements in which the code in block of statements is executed if the Boolean expression condition evaluates to true; no action is taken if condition evaluates to false.

• AAP-2.I.1 Nested conditional statements consist of conditional statements within conditional statements.

Details

1. Booleans refresher (5 minutes)

• Remind students what Boolean logic and Boolean variables are.
• Explain Boolean flags.

2. Using Boolean (20 minutes)

• Students will further how to incorporate Boolean flags in their programs.
• Students will evaluate code segments and modify them to use Boolean logic:
  • Students will work independently to modify the areYouHungry code segment to improve its functionality.
  • Students will work with a partner to use the NOT variable to move a sprite with the controllers and have the sprite say something.
• Encourage students to publish their projects and add the links.
• Guide students how to use:
  • Not
  • And
  • Or
  • Nested conditionals

3. Boolean practice (25 minutes)

• Go to Boolean Statements and Expressions.
• Task students with completing Tasks 3 and 4.
• If students have time, encourage them to complete the extensions activities.

4. Reflection/Homework

If you run out of time, you may also assign this as individual homework. Students should complete their reflection.

1. What is a Boolean flag? Describe a case in which you might you want to use one?

2. What is the difference between an AND block and an OR block?

   • In what cases will they both evaluate to true?
   • In what cases will they both evaluate to false?
   • In what cases will they evaluate differently?