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The option directive allows you to specify command line options within your program instead of actually specifying them on the command line It has the general form #pragma option option-list For some options, the option directive must precede all declarations, including function prototypes For this reason, it is a good idea to make it one of the first statements in your program The option directive also allows you to push options onto and pop options from a stack These additional options are good for saving the options state before including any files that may alter the compiler options and then restoring the state afterward When using the push and pop argument, you may receive a message indicating that the stack is not the same at the start of the file as it is at the end To eliminate these warning messages, you should use the nopushoptwarn directive The obsolete directive takes this form: #pragma obsolete ident and will generate a warning message that ident is obsolete, if ident is found within the code after the #pragma The pack directive packs the code on a specific byte alignment The package directive is used to ensure that all the units in a packaged source file are initialized in order of their dependencies The resource directive marks the file as a form unit for use by the IDE The warn directive allows you to enable or disable various warning messages It takes the form #pragma warn setting where setting specifies the warning option These options are discussed later in this book

<TextBlock FontSize="16" Name="textBlock1" VerticalAlignment="Center" HorizontalAlignment="Center"> <Bold>Goodbye</Bold> world, hello <Italic>Mars!</Italic></TextBlock>

The preprocessor directive consisting solely of a # followed by a newline is known as the null directive Any line that begins with this single character is ignored by the compiler

Boom in Personal Computing Emergence of Networking Applications (e-mail, Distributed Computing) Internet & e-commerce Applications Extranets and Supply Chain Applications : :

C++ Builder supports the Microsoft-defined #import directive, which is used to import information from a type library It is included only for Microsoft compatibility

If you run again, you ll see that the extra space has been ignored (figure 2.6). Figure 2.6 Where have all Notice that all the extra spacing has disappeared. This the spaces gone is probably less of a surprise to web developers than to Windows developers. XAML, like XHTML, uses normalized spacing. All whitespace around tags (including carriage returns, spaces, and tabs) is reduced to a single space. This is a compromise between the needs to have whitespace in content and the rules for XML that allow it to be formatted in any way. For example, this version of the preceding XAML is exactly equivalent:

C provides two preprocessor operators: # and ## These operators are used in conjunction with #define The # operator causes the argument it precedes to be turned into a quoted string For example, consider this program:

int main(void) { printf(mkstr(I like C++ Builder)); return 0; }

The Beginnings (Mid-1970s 1980s)

printf(mkstr(I like C++ Builder));

<TextBlock FontSize="16" Name="textBlock1" VerticalAlignment="Center" HorizontalAlignment="Center"> <Bold>Goodbye</Bold>

printf("I like C++ Builder");

Domination (Mid-1990s and beyond)

The ## operator is used to concatenate two tokens For example:

Your grandpa s Hello, World!

#include <stdioh> #define concat(a, b) int main(void) { int xy = 10; printf("%d", concat(x, y)); return 0; } a ## b

9:

If the spaces in the text were taken into account, the result would be quite different. Normalized spacing is a pretty good compromise but can sometimes cause unexpected results.3 Fortunately, there s a simple way to tell XML to preserve the white space around tags.

.

THE FOUNDATION OF C++ printf("%d", concat(x, y));

printf("%d", xy);

<TextBlock FontSize="16" Name="textBlock1" VerticalAlignment="Center" HorizontalAlignment="Center" xml:space="preserve"> <Bold>Goodbye</Bold> world, hello <Italic>Mars!</Italic> </TextBlock>

If these operators seem strange to you, keep in mind that they are not needed or used in most programs They exist primarily to allow some special cases to be handled by the preprocessor