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Sometimes you will want to use a reference parameter to receive a value from a method, but not pass in a value For example, you might have a method that performs some function, such as opening a network socket, that returns a success/fail code in a reference parameter In this case, there is no information to pass into the method, but there is information to pass back out The problem with this scenario is that a ref parameter must be initialized to a value prior to the call Thus, to use a ref parameter would require giving the argument a dummy value just to satisfy this constraint Fortunately, C# provides a better alternative: the out parameter An out parameter is similar to a ref parameter with this one exception: It can only be used to pass a value out of a method It is not necessary (or useful) to give the variable used as an out parameter an initial value prior to calling the method The method will give the variable a value Furthermore, inside the method, an out parameter is considered unassigned; that is, it is assumed to have no initial value This implies that the method must assign the parameter a value prior to the method s termination Thus, after the call to the method, an out parameter will contain a value Here is an example that uses an out parameter In the class Decompose, the GetParts( ) method decomposes a floating-point number into its integer and fractional parts Notice how each component is returned to the caller

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8:

Following are a few more examples of items that I would consider to be more than just straight calculations or transformations; they provide business intelligence: Measures that include time periods, such as Sales Year To Date or Days Late Variance analysis that compares the difference between two numbers, such as Current Year Sales versus Last Year Sales, Percentage of On-time Shipments Ratios, such as Market Share, Patient Visits per Diagnosis, Gross Margin Dimension groupings, such as customer age, income level, product size or type

// Use out using System;

b q b 2 Displacement Velocity Acceleration Jerk q y = h 1 - 4 1 - b y = 12 h q 1 - b b

class Decompose { /* Decompose a floating-point value into its integer and fractional parts */ public int GetParts(double n, out double frac) { int whole; whole = (int) n; frac = n - whole; // pass fractional part back through frac return whole; // return integer portion } } class UseOut { static void Main() { Decompose ob = new Decompose(); int i; double f; i = obGetParts(10125, out f); ConsoleWriteLine("Integer portion is " + i); ConsoleWriteLine("Fractional part is " + f); } }

.

The output from the program is shown here:

The GetParts( ) method returns two pieces of information First, the integer portion of n is returned as GetParts( ) s return value Second, the fractional portion of n is passed back to the caller through the out parameter frac As this example shows, by using out, it is possible for one method to return two values Of course, you are not limited to only one out parameter A method can return as many pieces of information as necessary through out parameters Here is an example that uses two out parameters The method HasComFactor( ) performs two functions First, it determines if two integers have a common factor (other than 1) It returns true if they do and false otherwise Second, if they do have a common factor, HasComFactor( ) returns the least and greatest common factors in out parameters

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