Raspberry Pi A, User Manual, Page: 177 / 314

C H A P T E R 1 1
A N I N T R O D U C T I O N T O S C R A T C H
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Figure 11-3:
A
Control block
joined to a
Looks block in
Scratch
This concept of connecting multiple bricks together is the heart of Scratch. If you look at the
Control brick you just placed, you’ll see there’s no connecting hole at the top. This means
that you can’t stack another brick on top, because this Control brick is designed to trigger a
series of other bricks directly and must come at the start of a stack. The bottom of the
say
brick, meanwhile, has a connector that fits into the top of other bricks, which indicates that
more bricks can be placed underneath.
With the two bricks in place, click the green flag icon at the top-right of the screen again. This
time, a speech bubble will appear from the cat’s mouth (see Figure 11-4), and the Hello
World program is complete.
Before moving on to the next example, take the time to save your work using the File menu.
Scratch is designed to have a single project open at a time, so if you create a new blank file,
the current file will be closed to make room. Don’t worry if you forget about this when you go
to create a new file—if there are unsaved changes in the existing file, Scratch will prompt you
to save these changes before closing it.