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If a parameter is not marked with a parameter modifier, it is assumed to be passed by value, meaning the called method receives a copy of the original data. Output parameters must be assigned by the method being called, and therefore are passed by reference. If the called method fails to assign output parameters, you are issued a compiler error. The value is initially assigned by the caller and may be optionally reassigned by the called method (as the data is also passed by reference). No compiler error is generated if the called method fails to assign a ref parameter. This parameter modifier allows you to send in a variable number of arguments as a single logical parameter. A method can have only a single params modifier, and it must be the final parameter of the method. In reality, you may not need to use the params modifier all too often, however be aware that numerous methods within the base class libraries do make use of this C# language feature.

To illustrate the use of these keywords, create a new Console Application project named FunWithMethods. Now, let s walk through the role of each keyword.

The default manner in which a parameter is sent into a function is by value. Simply put, if you do not mark an argument with a parameter modifier, a copy of the data is passed into the function. As explained at the end of this chapter, exactly what is copied will depend on whether the parameter is a value type or a reference type. For the time being, assume the following method within the Program class that operates on two numerical data types passed by value: // Arguments are passed by value by default. static int Add(int x, int y) { int ans = x + y; // Caller will not see these changes // as you are modifying a copy of the // original data. x = 10000; y = 88888; return ans; }

// Add a handler that runs once when the button is clicked. jQuery('#collapsibutton').one('click', function() { // Button clicked! Get rid of the button. jQuery('#collapsibutton').remove(); // Display all our hidden blocks using an effect. blocks.slideDown("slow"); }); }); When you enable the module on the Modules page, any blocks you have visible should disappear and be replaced with a plain button, as shown in Figure 18-5.

Numerical data falls under the category of value types. Therefore, if you change the values of the parameters within the scope of the member, the caller is blissfully unaware, given that you are changing the values on a copy of the caller s original data: static void Main(string[] args) { Console.WriteLine("***** Fun with Methods *****\n"); // Pass two variables in by value. int x = 9, y = 10; Console.WriteLine("Before call: X: {0}, Y: {1}", x, y); Console.WriteLine("Answer is: {0}", Add(x, y)); Console.WriteLine("After call: X: {0}, Y: {1}", x, y); Console.ReadLine(); } As you would hope, the values of x and y remain identical before and after the call to Add(), as shown in the following: ***** Fun with Methods ***** Before call: X: 9, Y: 10 Answer is: 19 After call: X: 9, Y: 10

Note In real use, a number entered in the previous examples would be checked for invalid characters before its value is compared. Code to do that is given in the case section.

Next, you have the use of output parameters. Methods that have been defined to take output parameters (via the out keyword) are under obligation to assign them to an appropriate value before exiting the method scope (if you fail to do so, you will receive compiler errors). To illustrate, here is an alternative version of the Add() method that returns the sum of two integers using the C# out modifier (note the physical return value of this method is now void): // Output parameters must be assigned by the called method. static void Add(int x, int y, out int ans) { ans = x + y; } Calling a method with output parameters also requires the use of the out modifier. However, the local variables which are passed as output variables are not required to be assigned before passing them in as output arguments (if you do so, the original value is lost after the call). The reason the compiler allows you to send in seemingly unassigned data is due to the fact that the method being called must make an assignment. The following code is an example: static void Main(string[] args) { Console.WriteLine("***** Fun with Methods *****"); ... // No need to assign initial value to local variables

Figure 18-5. A node being viewed with blockaway.module enabled After clicking the button, the blocks should appear using a sliding effect, becoming visible as shown in Figure 18-6.

Note The generic version of this interface (IComparer<T>) provides a more type-safe manner to handle comparisons between objects. You ll examine generics in 10.