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   9 <title>section 4.8: Block Structure</title>
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  15 <H2>section 4.8: Block Structure</H2>
  16
  17 pages 84-85
  18 <p>You've probably heard that global variables are ``bad''
  19 because they exist everywhere
  20 and it can be hard to keep track of who's using them.
  21 In the same way,
  22 it can be useful to limit the scope of a local variable
  23 to just the bit of the function that uses it,
  24 which is exactly what happens
  25 if we declare a variable in an inner block.
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