Lesson 11 : Boolean Operator

Challenge focus: 75 - 78

Coding Concepts : not operator

Properties

• mouth_closed

Methods

• toggle()

.

December 2023

Banana Tales I

Key stage III

Class VII

LESSON OVERVIEW

December 2023

Banana Tales I

Key stage III

Class VII

Lesson Objectives

At the end of the lesson, each child should be able to:

• The importance of the boolean operator(not).
• Truth table of the not operator.
• not operator with the if/if-else statement.
• Complete challenges 75 - 78.

December 2023

Banana Tales I

Key stage III

Class VII

Understanding not Operator

• The not operator reverses the result of the condition: True becomes False, and False becomes True.
• The not operator can be used in a conditional loop (while loop) or in an if statement.
• Truth Table:

December 2023

Banana Tales I

Key stage III

Class VII

Activity 1

Study the given statements and state whether it is true or false.

December 2023

Banana Tales I

Key stage III

Class VII

Activity 1 Solution

December 2023

Banana Tales I

Key stage III

Class VII

Demo 1

Study the challenge carefully. Write the codes in your notebook to help the banana reach to the monkey (challenge 75).

December 2023

Banana Tales I

Key stage III

Class VII

Demo 1 Solution

condition

• The ‘if’ statement along with ‘not’ operator will help in closing the mouth of crocodiles.
• The while loop will help in filling up the wells with water.
• mouth_closed: The property of a crocodile object.
• toggle(): This method switches between the two states of the crocodile's mouth - open and closed.

operator

December 2023

Banana Tales I

Key stage III

Class VII

Activity 2

Study the following challenge and solution carefully. Then answer the following questions in your notebook (challenge 77).

December 2023

Banana Tales I

Key stage III

Class VII

Activity 2 (Cont.)

1. Why is a for loop used in Line 1?
2. What does the len() function used in Line 1 do?
3. What does the if statement in Line 2-3 do?
4. What does the while loop in Line 6-7 do?

December 2023

Banana Tales I

Key stage III

Class VII

Activity 2 Solution

• Why is a for loop used in Line 1?

Ans: A for loop is used because there are many wells to fill up with water and many crocodiles to close mouth.

• What does the len() function used in Line 1 do?

Ans: The len() function used as len(wells) in Line 1 will count the total number of wells in the list called wells.

• What does the if statement in Line 2-3 do?

Ans: The if statement in Line 2-3 will check whether a crocodile’s mouth is opened or not. If it is open, then the state is toggled.

• What does the while loop in Line 6-7 do?

Ans: The while loop in Line 6-7 will make the elephants spray water in their respective wells until the current water_level of the wells become equal to its max_water_level.

December 2023

Banana Tales I

Key stage III

Class VII

Activity 3 - Practical

• Log into your CodeMonkey account.
• Open Banana Tales Part I
• Complete challenges 75 to 78.

December 2023

Banana Tales I

Key stage III

Class VII

Activity 3 Solution

75

December 2023

Banana Tales I

Key stage III

Class VII

Activity 3 Solution

76

December 2023

Banana Tales I

Key stage III

Class VII

Activity 3 Solution

December 2023

Banana Tales I

Key stage III

Class VII

Activity 3 Solution

December 2023

Banana Tales I

Key stage III

Class VII

Key Points

• The not operator reverses the result of the condition: True becomes False, and False becomes True.
• The not operator can be used in a conditional loop (while loop) or in an if statement.
• Crocodile object has a property called mouth_closed which determines its mouth state.
• The method toggle() switches between the two states of the crocodile's mouth - open and closed.

​

December 2023

Banana Tales I

Key stage III

Class VII