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Birch - Scratch Variables
Scratch Variables
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Slide 1:
Diapositive
Computing
Upper Secondary (Key Stage 4)
GCSE
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Scratch Variables
Slide 1 - Diapositive
My expectations
It's ok to be wrong
Listen when others are speaking
Slide 2 - Diapositive
Recall
Repeating steps in programming is called iteration. But you know it is as a different term?
Slide 3 - Diapositive
Recall
Repeating steps in programming is called iteration. But you know it is as a different term?
Loops or Looping
Slide 4 - Diapositive
Recall
What is the difference between these two blocks?
Slide 5 - Diapositive
Recall
What is the difference between these two blocks?
One repeats code inside the block 10 times while the other repeats it forever.
Slide 6 - Diapositive
This Half term
Introduction to scratch
Variables
Selection
Iteration
Lists
Games Design
Slide 7 - Diapositive
Learning objectives
Know
what a
variable
is
Know how to use variables in Scratch
Slide 8 - Diapositive
Dictionary definition of a computer
variable
"a named memory location in a program that stores a
value
that can
change
"
Slide 9 - Diapositive
What would the new value of score be after running these three blocks of code?
Slide 10 - Diapositive
What would the new value of score be after running these three blocks of code?
2
Slide 11 - Diapositive
Orange* blocks of code in Scratch are called Variables.
*we will see later that some variables are set in different colours.
Slide 12 - Diapositive
Variables are places in a program to store data that you might need later on.
Slide 13 - Diapositive
They can change as the program runs.
Slide 14 - Diapositive
You could use this variable, score, to keep track of the score of a game for example.
Slide 15 - Diapositive
What other variables could you think of that might be useful for a game?
Slide 16 - Diapositive
What other variables could you think of that might be useful for a game?
Slide 17 - Question ouverte
What other variables could you think of that might be useful for a game?
Score
Points
PlayerName
Goals
Lives
Shots
Time
Speed
Slide 18 - Diapositive
Slide 19 - Diapositive
PREDICT
Predict what you think will happen.
Slide 20 - Diapositive
Predict what you think will happen.
Write down your predictions.
Slide 21 - Question ouverte
RUN
Click this link
or visit
https://scratch.mit.edu/projects/1084991660/ to run the program
Slide 22 - Diapositive
Were your predictions correct?
Did anything surprise you?
Did your predictions miss anything out?
Slide 23 - Question ouverte
INVESTIGATE
How do the following two blocks of code relate to each other?
Slide 24 - Diapositive
How do 'ask_name' and 'define ask_name' relate to each other?
Slide 25 - Question ouverte
INVESTIGATE
When your program reaches the ask_name block, it calls the subroutine ‘define ask_name’.
‘define ask_name’ is a sub program
or a function.
Slide 26 - Diapositive
INVESTIGATE
What happens if you remove
'ask 'what is your name' and wait'
Slide 27 - Diapositive
How do 'ask_name' and 'define ask_name' relate to each other?
Slide 28 - Question ouverte
INVESTIGATE
What happens if you remove
'ask 'what is your name' and wait'
Big Ed will now only say “Hello”.
As the question has not been asked, there is no ‘answer’.
The line ‘set name to answer’ will now give name an empty value.
Slide 29 - Diapositive
INVESTIGATE
Below 'define ask_name'. There are two variables being used
Slide 30 - Diapositive
Below 'define ask_name'. There are two variables being used. What are their names?
Slide 31 - Question ouverte
INVESTIGATE
Below 'define ask_name'. There are two variables being used
Slide 32 - Diapositive
INVESTIGATE
Why do you think this code only says “Hello” and not “Hello” and the name you entered?
Slide 33 - Diapositive
Why do you think it only says “Hello” and not “Hello” and the name you entered?
Slide 34 - Question ouverte
INVESTIGATE
Why do you think this code only says “Hello” and not “Hello” and the name you entered?
It is because ‘name’ is being linked to ‘answer’ before the question is asked.
You must always set the value of a variable before using it.
Slide 35 - Diapositive
MODIFY
Modify the code that’s already in the program.
Slide 36 - Diapositive
Make
Use the code blocks to add a new question to be asked about your favourite sport or hobby.
Slide 37 - Diapositive
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