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10.3.2 NavigationCommands If you were writing a web browser, you d probably find what you need in NavigationCommands. These commands include BrowseForward, BrowseBack, Favorites, History, and so on. We aren t going to be using any of these commands in this particular application, but we could use them, for instance, in the navigation application we build in later chapters. 10.3.3 EditingCommands Think about creating a word processor and you ve got a good idea of what lives in the EditingCommands class. There are many commands in this class, including commands such as SelectUp, SelectRight, ToggleCenter, MoveUpLine, MoveToDocumentStart, MoveToDocumentEnd, and the list goes on. These commands are a lot more interesting; if you think about our RichTextBox, it s a lot like a miniature word processor. It stands to reason that it probably implements many of these commands (and it does), so we can hook these up quickly and turn our RichTextBox into a respectable control. We don t need to add a lot right now, but it would be good if we had alignment (left, right, justify, and center), text effects (bold, underline, italic) and that s probably enough. This time we ll hook the commands up to the toolbar we created above the RichTextBox. As we mentioned earlier, you can t add buttons through the toolbar s properties, but you can put buttons in place in XAML (put in seven), then open the Collection Editor (figure 10.2) for the toolbar by clicking the ellipsis button of the Items property. Set the properties for each button to represent the commands we want to have on our RichTextBox (table 10.3). On each Button, we set the Command to the respective command in the EditingCommands class. After the properties have been set, the XAML looks like this:

void func1(void) { int x; x = 10; } void func2(void) { int x; x = -199; }

2:

<ToolBar> <Button Command="EditingCommands.AlignLeft">Left</Button> <Button Command="EditingCommands.AlignCenter">Center</Button>

The integer variable x was declared twice, once in func1( ) and once in func2( ) The x in func1( ) has no bearing on, or relationship to, the x in func2( ) because each x is only known to the code within the same block as the variable s declaration The C language contains the keyword auto, which can be used to declare local variables However, since all nonglobal variables are assumed to be auto by default, it is virtually never used and the examples in this book will not use it (It has been said that auto was included in C to provide for source-level compatibility with its predecessor, B Further, auto is supported in C++ to provide compatibility with C) It is common practice to declare all variables needed within a function at the start of that function s code block This is done mostly to make it easy for anyone reading the code to know what variables are used However, it is not necessary to do this because local variables can be declared within any code block To understand how this works, consider the following function:

EPON systems are agnostic as far as transported data format is concerned Recent add-ons to the generic Ethernet technology, in terms of pseudo-wire emulation, standard telecommunications quality of service (QoS) measures, VLAN tagging, and transmission system protection mechanisms, allow current EPONs to deliver any type of data (including digitized voice, video, etc) with full QoS support, using a single framing format that perhaps has proven to be not the most efficient, as far as encapsulation overhead is concerned, but definitely the most robust among other existing data packet transmission protocols

void f(void) { int t; scanf("%d", &t); if(t==1) { char s[80]; /* s exists only inside this block */ printf("enter name:"); gets(s); process(s); } /* s is not known here */ }

<Button Command="EditingCommands.AlignRight">Right</Button> <Button Command="EditingCommands.AlignJustify">Justify</Button> <Button Command="EditingCommands.ToggleBold">Bold</Button> <Button Command="EditingCommands.ToggleItalic">Italic</Button> <Button Command="EditingCommands.ToggleUnderline">Underline</Button> </ToolBar>

Here, the local variable s is created upon entry into the if code block and destroyed upon exit Since s is known only within the if block, it may not be referenced elsewhere not even in other parts of the function that contains it There is one small restriction that you must observe when declaring local variables when using C if you want the widest portability: they must be declared at the start of a block, prior to any action statements This restriction does not apply to C++ One reason you might want to declare a variable within its own block, instead of at the top of a function, is to prevent its accidental misuse elsewhere in the function In essence, declaring variables inside the blocks of code that actually use them allows you to compartmentalize your code and data into more easily managed units Because local variables are destroyed upon exit from the function in which they are declared, they cannot retain their values between function calls (As you will see shortly, however, it is possible to direct the compiler to retain their values through the use of the static modifier)