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 instruction, and so on until they reach the end of the program. The command blocks of these programs are executed ...