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The -w flag turns on warnings This means that if Perl thinks you might be doing something wrong, then it ll tell you so before running the program It s not always right in particular, if you re reading from files, you may get some warnings if your data isn t always complete but most of the time it s worth at least taking another look at the warning use strict means that you have to declare all your variables before using them (or at least at the same time) This is demonstrated in line 11 You could also use this: my $file; // some stuff $file = "/etc/passwd"; But if you just have $file = "/etc/passwd", the script will complain and die.

CAUTION: If you add the gamekit key but later decide you don t want to make Game Kit a requirement, make sure you remove the gamekit entry. If you simply uncheck the gamekit check box, it actually tells iTunes that your app is not available on devices that do support Game Center. That s exactly the opposite of what you might expect. To actually make Game Kit an optional requirement, you ll have to remove the gamekit entry altogether.

Brackets enclose one or more optional items. Options are separated by vertical bars. Underscored value is the default used if you don t make a choice yourself. Braces enclose two or more items, separated by vertical bars. Choose precisely one of them. Horizontal ellipsis indicates that you may repeat the preceding item as many times as you like, or that irrelevant parts of the code are omitted.

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This is an absolute godsend if you are remotely prone to typos or to variable name forgetfulness (because if you declared $file and then try to set $dile, you will be told what you ve done) If you re not remotely prone to either of these events, then you are unusually fortunate; you should use strict anyway because it ll be even harder to find the mistake the one and only time your fingers or memory betray you It s best to declare all your variables up top, before you start, as in line 11 (Obviously, there s no need to do this for temporary variables such as loop variables) Again, it makes it much easier to keep track of what you re doing Don t hard-code anything Put it in a variable, and put it at the top of the file.

Next, you need to add the Game Kit framework to your Xcode project more specifically, to every target in your project. Locate the Targets group in the Groups & Files pane, and look for the bull s eye icon. In my test project there s only one target, called Tilemap, which you can either double-click or right-click, and then select Get Info to open the target s Info dialog. On the General tab, in the lower half, is the list of linked libraries that are used by this target. To add another library, click the + button below the Linked Libraries list. You ll see another list pop up like the one in Figure 14 3. You may need to unfold the category labeled Device iOS 4.1 SDK, and then locate the GameKit.framework entry and click the Add button. GameKit.framework will be added to the Linked Libraries list. By default, new libraries are added as Required. See the second column in the Linked Libraries list, labeled Type. The

You should not enter the characters of Table A-2 with a special meaning (square brackets, braces, vertical lines, and ellipsis) themselves. Regular parentheses (like the ones surrounding this text), commas, periods, single and double quotation marks (' and "), at signs (@),

setting Required means that your app will only work on devices where the GameKit.framework library is available. If that is what you want, and you ve added the gamekit key to Info.plist, you can leave it at that. Otherwise, change the setting to read Weak in order to be able to run the app even on devices that don t have Game Center available. We can account for that with a relatively simple check in code, and then disable any Game Kit features in case a device doesn t support Game Kit.

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