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CHAPTER 2 OVERVIEW OF C# PROGRAMMING
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WriteLine
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WriteLine is another member of Console, which performs the same functions as Write, but appends a newline character to the end of each output string. For example, if you use the preceding code, substituting WriteLine for Write, the output is on separate lines: System.Console.WriteLine("This is text 1."); System.Console.WriteLine("This is text 2."); System.Console.WriteLine("This is text 3."); This code produces the following output in the console window: This is text 1. This is text 2. This is text 3.
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CHAPTER 2 OVERVIEW OF C# PROGRAMMING
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The Format String
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The general form of the Write and WriteLine statements takes more than a single parameter. If there is more than a single parameter, the parameters are separated by commas. The first parameter must always be a string, and is called the format string. The format string can contain substitution markers. A substitution marker marks the position in the format string where a value should be substituted in the output string. It consists of an integer enclosed in a set of matching curly braces. The integer is the numeric position of the substitution value to be used. The parameters following the format string are called substitution values. These substitution values are numbered, starting at 0. The syntax is as follows: Console.WriteLine( FormatString, SubVal0, SubVal1, SubVal2, ... ); For example, the following statement has two substitution markers, numbered 0 and 1, and two substitution values, whose values are 3 and 6, respectively. Substitution markers Console.WriteLine("Two sample integers are {0} and {1}.", 3, 6); Format string Substitution values This code produces the following output on the screen:
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Two sample integers are 3 and 6.
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In C#, you can use any number of markers and any number of values. The values can be used in any order. The values can be substituted any number of times in the format string. For example, the following statement uses three markers and only two values. Notice that value 1 is used before value 0, and that value 1 is used twice. Console.WriteLine("Three integers are {1}, {0} and {1}.", 3, 6); This code displays the following on the screen:
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Three integers are 6, 3 and 6.
A marker must not attempt to reference a value at a position beyond the length of the list of substitution values. If it does, it will not produce a compile error but a runtime error (called an exception). For example, in the following statement there are two substitution values, with positions 0 and 1. The second marker, however, references position 2 which does not exist. This will produce a runtime error. Position 0 Position 1 Console.WriteLine("Two integers are {0} and {2}.", 3, 6); // Error! There is no position 2 value.
CHAPTER 2 OVERVIEW OF C# PROGRAMMING
Comments: Annotating the Code
You have already seen single-line comments, so here I ll discuss the second type of inline comments delimited comments and mention a third type called documentation comments. Delimited comments have a start marker and an end marker. Text between the matching markers is ignored by the compiler. Delimited comments can span any number of lines. For example, the following code shows a delimited comment spanning multiple lines. Beginning of comment spanning multiple lines /* This text is ignored by the compiler. Unlike single-line comments, delimited comments like this one can span several lines. */ End of comment A delimited comment can also span just part of a line. For example, the following statement shows text commented out of the middle of a line. The result is the declaration of a single variable, var2. Beginning of comment int /*var 1,*/ var2; End of comment
Note Single-line and delimited comments behave in C# just as they do in C and C++.
CHAPTER 2 OVERVIEW OF C# PROGRAMMING
More About Comments
There are several other important things you need to know about comments: Nested comments are not allowed. Only one comment can be in effect at a time. The comment that starts first is in effect until the end of its scope. The scope for particularly comment types is as follows: For single-line comments, the end of the current line For delimited comments, the first end delimiter encountered The following attempts at comments are incorrect: Opens the comment /* This is an attempt at a nested comment. /* Ignored because it is inside a comment Inner comment */ Closes the comment because it is the first end delimiter encountered */ Syntax error because it has no opening delimiter Opens the comment // Single-line comment */ Ignored because it is inside a comment /* Nested comment Incorrect because it has no opening delimiter
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