Answers to Chapter 8 Review Questions
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4.  Changing the interface requires changing every program that
    depends on it, which can be very "time-consuming, error-prone
    activity". Doesn't mean you can't change how a specific function
    is implemented, or extend the interface.

5.  Psuedo-random number is a random number that is generated by a
    deterministic algorithm; it is not truely random because it is 
    impossible from a deterministic algorithm, but it is close enough to 
    real random number that it is good enough.  Pseudo-random numbers
    are: (1) statistically equivalent to true random numbers; and (2) very 
    difficult to predict.

8.  RandomInteger(1, 100)

10. No. The statement
    d1 = d2 = RandomInteger(1, 6);
    always assigns d1 and d2 the same value because the value assigned
    to d1 is always the result of the embedded assignment to d2.

12. #ifndef _magic_h
    #define _magic_h
      . . . contents of the interface . . .
    #endif

    These lines ensure that the compiler processes the contents of the
    interface only once, even if it is included several times.

13. True. Unless you take special steps to change the random
    number seed, the rand function generates the same sequence of
    pseudo-random numbers every time.

15. Take out the call to Randomize().