Page 145 - Learn To Program With Scratch

6

m a k ing Deci Sio n S

This chapter will teach you the Scratch tools you need

to write programs that can compare values, evaluate
logical expressions, and make decisions based on the
results. We’ll also go through several useful example
applications. Here’s what you’ll learn along the way:

• Basic problem-solving techniques
• How to use the if and if/else blocks to choose among alternative
actions
• How to construct logical expressions to evaluate given conditions
• The flow of control in branching statements

The programs we have written so far follow a simple execution model.
They start with the first instruction, execute it, move on to the next instruc-
tion, and so on until they reach the end of the program. The command
blocks of these programs are executed in sequence, without any skipping
or jumping.

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