You don’t have to declare all your variables at the beginning of a method. The scope of a variable begins once it is declared and terminates at when it reaches the closing curly brace of within the body of code that it was declared. When a program enters a block of code where a variable has scope, that variable has come into scope (the variable is visible to the program).
If you get a compiler error that says your variable "cannot be resolved to a variable", then you have a variable scope issue!
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