Question 1

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1)  The variables a and b should be non-static.  This 

    is because each instance of a ComplexNumber should 

    have its own values for the real and imaginary 

    parts.

2)  public

3)  ComplexNumber.java

4)  No.  The ComplexNumber class provides the service

    related to complex numbers.  It doesn't have 

    (need) a main method.  A client class that has

    a main method, together with the ComplexNumber 

    class, is an application.





Question 5

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1)  This is due to round off error caused by a 

    limitation in the precision of the double type.

    Notice that for the results that do not match up, 

    the result is very very close to zero.

2)  The for loop terminates when the condition 

    (choice!=8) is no longer true.  No "increment" is 

    needed for the condition to evaluate to false--the 

    user chooses a choice value each time before the 

    loop body executes.  Assuming a sane user, the loop 

    will terminate when the user chooses to quit 

    (choice 8).

    The "update" in this loop is the assignment 

    statement that reads the user input into variable 

    choice.