Transcript tenSessionScratchL6.ppt

Scratch Programming
Session 6 of 10
If-then-else statements
interactions
Final projects specifications
Objectives for Session 6
• If Statement
– If Else Statement
• Interaction
If Statement
• If you are 12, raise your hand
• If you like baseball, stand up
If Statement Programming View
• If ( you are 12)
{
raise your hand
}
• If ( you like baseball)
{
stand up
}
If Statement Scratch View
• The If Statement
– Located in the Control Menu
True or false test
Statements to do
only if test is true
If Statement Practice
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•
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•
Let’s create an If Statement
Create a variable A
Set A to 0
Create an If Statement
If A > 2
Perform some Motion
Change A to 3
If Statement Practice
• Try creating the following If Statement on your
own
• If ( A = B )
{
Move 5 steps
}
If Else Statement
• If you like football, raise your hand
Else stand up
• If you are 11, go to the right side of the room
Else go to the left side of the room
If Else Statement
• If ( you are 11 )
{
raise your hand
}
Else
{
stand up
}
If Else Statement Practice
• Loop forever
• If the mouse is clicked
– Move 10 steps
• Else
– Turn 15 degrees
If Else Statement Practice
• Create your own If Else Statement
Interaction
• Between two Sprites
• Examples
– When two Sprites are touching
– When one Sprite is clicked by mouse
Interaction Example
• Start with a blank
screen
• Create another Sprite
• Make sure your cat is
facing the first Sprite
Interaction Example cont.
• Add this in for the cat
• When space bar clicked
• If touching Sprite2
– Say hello
• Else
– Move 10 steps
Interaction Example cont.
• Add this in for the second Sprite
• When space bar clicked
• If touching Sprite1
– Say I’m standing here
Interaction Practice
• Create your own example
• Using Two or Three Sprites
• Use touching
Review
• You now know:
– How to create an If Statement
– How to create an If Else Statement
– How to sense touching other Sprites
Final Project
• Create a story, a lesson, a game, or a
simulation
• Use at least two sprites that interact in some
way
• Use at least two scenes and backgrounds
• Use some sound and motion
• Have some properties change, such as size or
color, or shape