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optional arguments specify the starting and stopping indexes of the portion of the string to display If stop is not passed a value, then it defaults to 1, which indicates that the stopping point is the end of the string If start is not passed a value, then it defaults to 0 Therefore, if neither optional argument is present, the string is displayed in its entirety Otherwise, the indicated portion of the string is displayed This means that if you call Display( ) with one argument (the string to display), the string is shown in its entirety If you call Display( ) with two arguments, then the characters beginning at start through the end of the string are shown If all three arguments are passed, then the portion of the string from start to stop is shown Although this example is quite simple, it does demonstrate the essential benefit that optional arguments offer It lets you specify only those arguments that are needed by your usage Default values don t need to be explicitly passed Before moving on, an important point must be made Although optional arguments are a powerful tool when used correctly, they can also be misused The point of optional arguments is to allow a method to perform its job in an efficient, easy-to-use manner while still allowing considerable flexibility Toward this end, the default values of all optional arguments should facilitate the normal use of a method When this is not the case, the use of optional arguments can destructure your code and mislead others Finally, the default value of an optional parameter should cause no harm In other words, the accidental use of an optional argument should not have irreversible, negative consequences For example, forgetting to specify an argument should not cause an important data file to be erased!.

Brad explained that there are several factors that need to be discussed in his report Transportation interruptions can affect our delivery commitments Hurricanes in Florida and Georgia and blizzards in Illinois have to be considered Some states have a greater skilled labor pool and some states are more management friendly than others We re a nonunion com172

Another feature related to passing arguments to a method is the named argument Named arguments were added by C# 40 As you know, normally, when you pass arguments to a method, the order of the arguments must match the order of the parameters defined by the method In other words, an argument s position in the argument list determines to which parameter it is assigned Named arguments remove this restriction With a named argument, you specify the name of the parameter to which an argument applies Using this approach, the order of the arguments is not important Thus, named arguments are a bit like object initializers described earlier, although the syntax differs To specify an argument by name, use this syntax: param-name : value Here, param-name specifies the name of the parameter to which value is passed Of course, param-name must specify a valid parameter name for the method being called Here is a simple example that demonstrates named arguments It creates a method called IsFactor( ) that returns true if the first parameter can be evenly divided by the second

// Use named arguments using System; class NamedArgsDemo { // Determine if one value is evenly divisible by another static bool IsFactor(int val, int divisor) { if((val % divisor) == 0) return true; return false; }

This book has a great many exercises For some we provide sketches of solutions and for others we provide just the answers For some, where there is repetition, we provide no answer For the sake of mastery, we encourage the reader to write out complete solutions to all the problems

8:

// Call by use of positional arguments if(IsFactor(10, 2)) ConsoleWriteLine("2 is factor of 10"); // Call by use of named arguments if(IsFactor(val: 10, divisor: 2)) ConsoleWriteLine("2 is factor of 10"); // Order doesn t matter with a named argument if(IsFactor(divisor: 2, val: 10)) ConsoleWriteLine("2 is factor of 10"); // Use both a positional argument and a named argument if(IsFactor(10, divisor: 2)) ConsoleWriteLine("2 is factor of 10"); } }

The output is shown here:

As the output shows, each method of calling IsFactor( ) produces the same result Beyond showing the named argument syntax in action, the program demonstrates two important aspects of named arguments First, the order of specifying the arguments doesn t matter For example, these two calls are equivalent:

1

IsFactor(val :10, divisor: 2) IsFactor(divisor: 2, val: 10)