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In general then, we will put in the DMZ all services accessible by external folks and allow none onto our internal network. (We all recognize that there will be exceptions to this rule. In all cases, make sure that you design the firewall rules carefully so as not to get any unintended consequences.) Figure 31-3 shows the FTP, mail, and Web (HTTP) servers in the DMZ.

Although the pushrod and valve stem were considered rigid, it is reasonable to consider adding their stiffnesses in series to that of the coil spring as Chen (1982) suggests in reducing a similar model. In this case, it makes very little difference since there is such a vast discrepancy in the stiffnesses of the pushrod and valve stem and that of the coil spring. If these springs are added in series with proper accounting for the rocker arm ratio, 1 1 1 1 = 2 + 2 + Keq rra Kcs rra Kvs K pr 1 1 1 = + + (1.7)2 (230 lb in ) (1.7)2 ( 4.7 10 5 lb in ) 3.0 10 5 lb in so Keq = 660 lb/in, which is exactly the same as Kvs to two signi cant gures (the values differ by about 0.3 percent). The fact that the equivalent stiffness resembles that of the coil spring provides additional justi cation for assuming these elements to be rigid. Thus a simpli ed model of this system can be obtained by using these equivalent mass and stiffness values. Over what frequency range is this model likely to be valid To get a rough idea, consider that the natural frequency of the system with this mass and stiffness is w n = 32.2 12 Keq Meq = 420 rad s = 67 Hz

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#include <stdio.h> int main(void) { int i; char str[80], str2[80]; scanf("%d%[abcdefg]%s", &i, str, str2); printf("%d %s %s", i, str, str2); return 0; }

ware necessary to run the game. In order to prevent piracy, the external beta testers are normally given a copy of the game that only works for a limited time; they also sign an agreement not to make copies of the game. Open beta testing is normally restricted to a fixed period. Open beta testing is of mixed value. On the one hand, ordinary gamers will think of all kinds of weird things to try on the game that the alpha test plan might not have included. The outside beta testers might have hardware configurations that are different from the ones the internal testers have. In those respects, open beta testing is tougher and potentially covers areas that alpha testing didn t. It also has some marketing value; non-employee beta-testers will talk and raise gamers enthusiasm about the game (as long as it isn t too buggy when they get it). On the other hand, however, open beta testing is haphazard. You can t hand external beta testers a checklist and make them complete it; they re not getting paid. You can never be quite sure what they ll cover and what they ll ignore. Also, because they re ordinary gamers and not professional testers, they might not be as observant, or be able to describe the bugs they find in a way that s helpful to the programmers. They might even report things as bugs that are just features they don t like. Open beta testing takes a lot of management, and not all publishers bother with it on all games.

Here is a very simple example that shows how C++ exception handling operates:

FIGURE 26-1

Of course, an object of TwoDShape has no knowledge of or access to any classes derived from TwoDShape.

sw.Reset(); sw.Start(); // Sequential version of initialization loop. for(int i=0; i < data.Length; i++) data[i] = i; sw.Stop(); Console.WriteLine("Sequential initialization loop: {0} secs", sw.Elapsed.TotalSeconds); Console.WriteLine();