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Not sure I really need to explain this one, but you best get an idea of exactly what you are expected to administer Chances are your initial list will not be complete, but it will give you an immediate baseline of reference Trust me, at some point some person will walk up to you and start talking about a server you never knew existed And they will be very confused as to why you have never heard of it, since they work with it all the time, there is a database there, and you are the DBA Do your best to gather as much information right away as you can.

That was enough to focus my attention on that code and realize that a data structure wasn t being properly copied As a result, later down the line there was a side-effect bug where something was getting clobbered And so I repaired that and then fed the numbers through and got the right answer and Gosper seemed to be satisfied A week later he came back with two somewhat larger numbers and said, These don t divide properly either This time, properly prepared, I returned to that same little stretch of ten instructions and discovered there was a second bug of the same kind in that code So then I scoured the code thoroughly, made sure everything was copied in the right ways, and no errors were ever reported after that Seibel: That s always the trick that there s going to be more than one.

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Steele: So I guess there s lessons there the lesson I should have drawn is there may be more than one bug here and I should have looked harder the first time But another lesson is that if a bug is thought to be rare, then looking at rarely executed paths may be fruitful And a third thing is, having good documentation about what the algorithm is trying to do, namely a reference back to Knuth, was just great Seibel: When it s not just a matter of waking up in the middle of the night and realizing what the problem is, what are your preferred debugging techniques Do you use symbolic debuggers, print statements, assertions, formal proofs, all of the above.

C++/CLI allows you to define static operators on a class. This avoids the need for some operators to be global, such as addition between a class type and a primitive type. Usually, these functions require access to the internals of a class, so the concept of friend functions and friend classes is often used in C++ to allow external operator functions to access the internals of a type. To illustrate the problem, in C++ implement a class that allows addition as an integer. Perhaps it s a class called Complex (see Listing 7-21). To support the + operator with complex numbers and ordinary doubles, you have to implement several global functions. Listing 7-21. Defining a Class to Represent Complex Numbers // complex.h using namespace System; class Complex { double re; double im; public: Complex() : re(0.0), im(0.0) { }

Guy Steele Steele: I admit to being lazy the first thing I will try is dropping in print statements to see if it will help me, even though that is probably the least effective for dealing with a complicated bug But it does such a good job of grabbing the simple bugs that it s worth a try On the other hand, one of the great revelations in the evolution of my thinking about programming was when I was working on that one project in Haskell Because it was a purely functional language, I couldn t just drop in print statements This forced me to go 100 percent to a regimen of unit testing So I proceeded to construct thorough unit tests for each of my subprocedures And this turned out to be a very good discipline.

This has influenced the design of Fortress to try to include features that would encourage the construction of unit tests And recording them alongside the program text, rather than in separate files To that extent we borrowed some ideas of say, Eiffel s Design by Contract and similar things where you can put preconditions and postconditions on procedures There are places where you can declare test data and unit-test procedures, and then a test harness will take care of running those whenever you request Seibel: Since you just mentioned Design by Contract, how do you use assertions in your own code Steele: I have a tendency to drop in assertions, particularly at the beginnings of procedures and at important points along the way.

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