Comments in Visual C#

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Comments
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parameter to follow immediately after the format string, it corresponds to index value 0 Similarly, lastName corresponds to index value 1 Note that the placeholders within the format string need not appear in order For example, Listing 116 switches the order of the indexed placeholders and adds a comma, which changes the way the name is displayed (see Output 16)
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Listing 116: Swapping the Indexed Placeholders and Corresponding Variables
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SystemConsoleWriteLine("Your full name is {1}, {0}", firstName, lastName);
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OUTPUT 16:
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Hey you! Enter your first name: Inigo Enter your last name: Montoya Your full name is Montoya, Inigo
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In addition to not having the placeholders appear consecutively within the format string, it is possible to use the same placeholder multiple times within a format string Furthermore, it is possible to omit a placeholder It is not possible, however, to have placeholders that do not have a corresponding parameter
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In this section, you modify the program in Listing 115 by adding comments In no way does this vary the execution of the program; rather, providing comments within the code makes it more understandable Listing 117 shows the new code, and Output 17 shows the corresponding output
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Listing 117: Commenting Your Code
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class CommentSamples { static void Main() {
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Single-Line Comment
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string firstName; // Variable for storing the first name string lastName; // Variable for storing the last name
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1: Introducing C#
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SystemConsoleWriteLine("Hey you!");
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Delimited Comment Inside Statement
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SystemConsoleWrite /* No new line */ ( "Enter your first name: "); firstName = SystemConsoleReadLine(); SystemConsoleWrite /* No new line */ ( "Enter your last name: "); lastName = SystemConsoleReadLine(); /* Display a greeting to the console Delimited Comment using composite formatting */ SystemConsoleWriteLine("Your full name is {0} {1}", firstName, lastName); // This is the end // of the program listing } }
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OUTPUT 17:
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Hey you! Enter your first name: Inigo Enter your last name: Montoya Your full name is Inigo Montoya
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In spite of the inserted comments, compiling and executing the new program produces the same output as before Programmers use comments to describe and explain the code they are writing, especially where the syntax itself is difficult to understand, or perhaps a particular algorithm implementation is surprising Since comments are pertinent only to the programmer reviewing the code, the compiler ignores comments and generates an assembly that is devoid of any trace that comments were part of the original source code Table 12 shows four different C# comment types The program in Listing 117 includes two of these A more comprehensive discussion of the XML comments appears in 9, where I discuss the various XML tags that are explicitly part of the XML standard
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Comments
TABLE 12: C# Comment Types
Comment Type Delimited comments
Description A forward slash followed by an asterisk, /*, identifies the beginning of a delimited comment To end the comment use an asterisk followed by a forward slash: */ Comments of this form may span multiple lines in the code file or appear embedded within a line of code The asterisks that appear at the beginning of the lines but within the delimiters are simply for formatting Comments may also be declared with a delimiter comprising two consecutive forward slash characters: // The compiler treats all text from the delimiter to the end of the line as a comment Comments of this form comprise a single line It is possible, however, to place sequential singleline comments one after another, as is the case with the last comment in Listing 117 Comments that begin with /** and end with **/ are called XML delimited comments They have the same characteristics as regular delimited comments, except that instead of ignoring XML comments entirely, the compiler can place them into a separate text file XML delimited comments were only explicitly added in C# 20, but the syntax is compatible with C# 10 XML single-line comments begin with /// and continue to the end of the line In addition, the compiler can save single-line comments into a separate file with the XML delimited comments