Answers to Chapter 10 Review Questions
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4. A mixture of C code and English. The English is used to
   represent parts of the program that have yet to be coded.

6. A token is a contiguous set of characters that stand together
   as a meaningful unit.

7. Local and global variables differ in their scope and lifetime.
   Local variables are available only to the function in which
   they are declared; global variables are available to all functions
   in the module in which they are declared. Local variables 
   disappear when the function returns; global variables retain
   their values throughout the lifetime of the program.

8. Local variables are declared inside functions. Global variables
   are declared at the top of the program or module, outside any
   functions.

9. Local variables are available only to the function in which
   they are declared; global variables are available to all functions
   in the module in which they are declared.

10. You have to look at the entire program to understand where global
    variables are being modified. This often makes programs harder to debug.

11. As part of a variable declaration, the keyword "static" ensures
    that the variable can be referenced only within the current module.
    The keyword plays a similar role in the declaration of functions. If
    a function is declared as static, it can only be called from
    within that module.

12. Static initialization sets the value of a variable before program
    execution even begins. Dynamic initialization (e.g., via assignment
    statements) only takes effect when the program is run. Static 
    initialization is most useful if a variable should have a particular
    default value that only a few clients might want to change.