Operator Order of Precedence in Visual C#

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Table 35 Operator Order of Precedence
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Category Primary Unary Multiplicative Additive Shift Relational and type testing Equality Logical AND Logical XOR Logical OR Conditional AND Conditional OR Conditional Assignment Operators
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xy f(x) a[x] x++ x-- new typeof checked unchecked + - ! ~ ++x --x (T)x * / % + -; << >> < > <= >= is as
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== != & ^ | && || : = *= /= %= += -;= <<= >>= &= ^= |=
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Rows appear in order of precedence from highest to lowest
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Given coverage of most of the operators, the next topic was control flow statements The last sections of the chapter detailed the preprocessor directives and the bit operators, which included code blocks, scope, Boolean expressions, and bitwise operators Perhaps one of the best ways to review all of the content covered in s 13 is to look at the tictac-toe program found in Appendix B By reviewing the program, you can see one way in which you can combine all that you have learned into a complete program
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4 Methods and Parameters
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F rom what you have learned about C# programming so far, you should be able to write structured programs that are similar to programs created in the 1970s Obviously, programming has come a long way since the 1970s, and the next major programming paradigm was structured programming Structured programming provides a construct into which statements are grouped together to form a unit Furthermore, with structured programming, it is possible to pass data to a group of statements and then have data returned once the statements have executed This chapter covers how to group statements together into a method In addition, it covers how to call a method, including how to pass data to a method and receive data from a method
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Besides the basics of calling and defining methods, this chapter also covers some slightly more advanced conceptsnamely, recursion and method overloading All method calls discussed so far and through the end of this chapter are static (a concept which 5 explores in detail) Even as early as the HelloWorld program in 1, you learned how to define a method In that example, you defined the Main() method In this chapter, you will learn about method creation in more detail, including the special C# syntax for parameters that pass data to and from a method (ref ) using a single parameter, as well as parameters that only pass data out from a method (out ) Lastly, I will touch on some rudimentary error handling
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Calling a Method
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Beginner Topic: What Is a Method
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Up to this point, all of the statements in the programs you have written have appeared together in one grouping called a Main() method As programs become even minimally larger, a single method implementation quickly becomes difficult to maintain and complex to read through and understand A method is a means of grouping together a sequence of statements to perform a particular action This provides greater structure and organization for the statements that comprise a program Consider, for example, a Main() method that counts the lines of source code in a directory Instead of having one large Main() method, you can provide a shorter version that allows you to hone in on the details of each method implementation as necessary Listing 41 shows an example
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Listing 41 Grouping Statements into Methods
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class LineCount { static void Main() { int lineCount; string files; DisplayHelpText(); files = GetFiles(); lineCount = CountLines(files); DisplayLineCount(lineCount); } // }
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Instead of placing all of the statements into Main(), the listing breaks them into groups called methods Statements related to displaying the help text, a group of SystemConsoleWriteLine() statements, have been moved to the DisplayHelpText() method All of the statements used to determine which files to count appear in the GetFiles() method To actually count the files, the code calls the CountLines() method before displaying the results using the DisplayLineCount() method With a quick glance, it is easy to review the code and gain an overview, because the method name describes the implementation A method is always associated with a class, and the class provides a means of grouping related methods together Calling a method is conceptually the same as sending a message to a class
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Methods can receive data via parameters Parameters are "variables" used for passing data from the caller (the method containing the method call) to the target method (Write(), WriteLine(), GetFiles(), CountLines(), and so on) In Listing 41, files and lineCount are examples of parameters passed to the CountLines() and DisplayLineCount() methods Methods can also return data back to the caller via a return value(in Listing 41, the GetFiles() method call has a return value that is assigned to files)
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To begin, you will reexamine SystemConsoleWrite(), SystemConsoleWriteLine(), and SystemConsoleReadLine() from 1 This time, look at them as examples of method calls in general, instead of looking at the specifics of printing and retrieving data from the console Listing 42 shows each of the three methods in use
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