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Y10 AU – CT8 – Introducing Conditional Loops

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CT8 – Y10 AU – Introducing Conditional Loops

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⏱️ Do It Now:
Answer the following questions

(1) Identify the key term we use to describe a conditional statement within another.

(2) Outline what is meant by a branching conditional sequence.

(3) Explain the difference between initialisation and assignment.


Extension Question
————————————————————————-
(4) Explain how we could test form more than one correct answer,
without using a branching conditional sequence.



🎯 Objectives:

(1) We will be able to identify a conditional looping sequence

(2) We will be able to create a conditional looping sequence

(3) We will be able to represent a conditional looping sequence with a flowchart

🔎 Investigation / Class Discussion

Analyse the code below:

(1) What do you think it does?
(2) Can the user influence alternative outcomes?

# Activity 1 Code

#------------------------------ Global Variables -------------------------------

guessNumber = 9 # Initialising a variable that stores the number the user must guess

userGuess = 0 # Initialising an empty variable to store the user's response

#-------------------------------- Main Program ---------------------------------

# Outputting a welcome message to the user
print("Welcome to the amazing number guess program...")


# Assigning an input (cast to integer) from the user to userGuess
userGuess = int(input("Guess the number I am thinking of between 1 - 10: "))


# Conditional loop requiring the user to keep trying until they correctly guess the number
while userGuess != guessNumber:
    print("Unfortunately that is incorrect")
    userGuess = int(input("Please guess again: "))


# Outputting a positive message to the user once they guess correctly
print("Correct... Well done!")

✍️ Representing as a flowchart

(1) Copy the code above into OneNote

(2) Work with your teacher on representing it as a flowchart

⌨️ Activity 2a – Password Program

(1) Run the following program:
The correct username is user123
The correct password is password123
Enter the wrong information a few times to see what the program does

(2) Create a flowchart that represents the program

(3) Write the program that follows the flowchart

(4) Ensure the flowchart and your code are added to OneNote

⌨️ Activity 2b – Extending your program

(1) Using a boolean operator (AND or OR)
Use only a single conditional loop (while loop) to check that both the username and password are correct

(2) You don’t need to create a flow chart for this additional task

(3) Make sure you evidence the code in OneNote

⌨️ Activity 3 – Extension Activities

(1) At the bottom of this task are examples of different checks that can be carried out on a user input.
Have a look through them.

(2) Use a conditional loop to carry out at least one of these checks in a real-world context e.g. if it asks the user to enter their age, it checks to see they have actually entered a number.

(3) Ensure you evidence any annotated code in OneNote

Examples of different checks that can be carried out:

# Examples of different validation checks in conditional sequences

userInput = input("Enter a string: ")

# Length check
if len(userInput) >= 5:
    print("✓ String is at least 5 characters long")
else:
    print("✗ String is less than 5 characters long")



# Alphabetic check
if userInput.isalpha():
    print("✓ String contains only letters")
else:
    print("✗ String contains characters other than letters")



# Numeric check
if userInput.isnumeric():
    print("✓ String contains only numbers")
else:
    print("✗ String contains characters other than numbers")

⌨️ Plenary – Lesson Summary

Write a brief overview of what you have learned this lesson:

(1) What a conditional loop looks like, and the key terms used

(2) How it is represented in a flow chart

(3) What you used a conditional loop for