You actually can declare variables within a switch if you do it according to the syntax of the language. You're getting an error because " case 0: " is a label, and in C it's illegal to have a declaration as the first statement after a label — note that the compiler expects an expression such as a method call, normal assignment, etc. (Bizarre though it may be, that's the rule.).
I've run into this issue before, and the conclusion was that you just put the code inside a block.
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