Appendix D. Variable Scope
The rule of variable scope is defined simply: a variable created
inside a block (code enclosed within braces: {
and }
)
exists only inside that block. This means that a variable created inside
setup() can be used only within the
setup() block, and likewise, a variable declared
inside draw() can be used only inside the
draw() block. The exception to this rule is a
variable declared outside of setup() and
draw(). These variables can be used in both
setup() and draw() (or inside
any other function that you create). Think of the area outside of
setup() and draw() as an implied
code block. We call these variables global variables, because they can be used anywhere within the program. We call a variable that is used only within ...
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