A Word about Blocks Last week, you learned that statements are the fundamental instructions in any given programming language. Statements may be grouped together in blocks .
Blocks are important for the purposes of variable scoping.
More importantly, blocks provide a means of using control flow statements to determine whether or not a given group of statements should be executed as your program runs. It is not necessary to place a semicolon after the closing curly brace of a block. Sequences Sequences are simply a chain of statements being executed one after the other. Below you can see some sample code illustrating a sequence. They are used to choose whether a given chunk of code should be executed or not.