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This is the second type of comment supported by C# A single-line comment begins with a // and ends at the end of the line Although styles vary, it is not uncommon for programmers to use multiline comments for longer remarks and single-line comments for brief, line-byline descriptions (The third type of comment supported by C# aids in the creation of documentation and is described in the Appendix) The next line of code is shown here:

static void Main() {

This line begins the Main( ) method As mentioned earlier, in C#, a subroutine is called a method As the comment preceding it suggests, this is the line at which the program will begin executing All C# applications begin execution by calling Main( ) The complete meaning of each part of this line cannot be given now, since it involves a detailed understanding of several other C# features However, since many of the examples in this book will use this line of code, we will take a brief look at it here The line begins with the keyword static A method that is modified by static can be called before an object of its class has been created This is necessary because Main( ) is called at program startup The keyword void indicates that Main( ) does not return a value As you will see, methods can also return values The empty parentheses that follow Main indicate that no information is passed to Main( ) Although it is possible to pass information into Main( ), none is passed in this example The last character on the line is the { This signals the start of Main( ) s body All of the code that comprises a method will occur between the method s opening curly brace and its closing curly brace The next line of code is shown here Notice that it occurs inside Main( )

2

ConsoleWriteLine("A simple C# program");

2:

An Overview of C#

x2 4 = lim x + 2 = 4 x 2 x 2 x 2 (c) lim (x 4) cot(x 4) = lim [(x 4)/ sin(x 4)] cos(x 4) =

This line outputs the string A simple C# program followed by a new line on the screen Output is actually accomplished by the built-in method WriteLine( ) In this case, WriteLine( ) displays the string that is passed to it Information that is passed to a method is called an argument In addition to strings, WriteLine( ) can be used to display other types of information The line begins with Console, which is the name of a predefined class that supports console I/O By connecting Console with WriteLine( ), you are telling the compiler that WriteLine( ) is a member of the Console class The fact that C# uses an object to define console output is further evidence of its object-oriented nature Notice that the WriteLine( ) statement ends with a semicolon, as does the using System statement earlier in the program In general, statements in C# end with a semicolon The exception to this rule are blocks, which begin with a { and end with a } This is why those lines in the program don t end with a semicolon Blocks provide a mechanism for grouping statements and are discussed later in this chapter The first } in the program ends Main( ), and the last } ends the Example class definition One last point: C# is case-sensitive Forgetting this can cause serious problems For example, if you accidentally type main instead of Main, or writeline instead of WriteLine, the preceding program will be incorrect Furthermore, although the C# compiler will compile classes that do not contain a Main( ) method, it has no way to execute them So, had you mistyped Main, you would see an error message that states that Exampleexe does not have an entry point defined