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Let s look closely at this program to understand why this output is produced First, notice the program defines the symbol TRIAL Next, notice how the methods Trial( ) and Release( ) are coded They are both preceded with the Conditional attribute, which has this general form: [Conditional symbol] where symbol is the symbol that determines whether the method will be executed If the symbol is defined, then when the method is called, it will be executed If the symbol is not defined, then the method is not executed Inside Main( ), both Trial( ) and Release( ) are called However, only TRIAL is defined Thus, Trial( ) is executed The call to Release( ) is ignored If you define RELEASE, then Release( ) will also be called If you remove the definition for TRIAL, then Trial( ) will not be called The Conditional attribute can also be applied to an attribute class (that is, a class that inherits Attribute) In this case, if the symbol is defined when the attribute is encountered during compilation, the attribute is applied Otherwise, it is not

17:

d d cos x dx sin x sin x dx cos x d sin x d tan x = = dx dx cos x (cos x)2

Conditional methods have a few restrictions First, they must return void Second, they must be members of a class or structure, not an interface Third, they cannot be preceded with the override keyword

The Obsolete attribute, which is short for SystemObsoleteAttribute, lets you mark a program element as obsolete Here is one of its forms: [Obsolete( message )] Here, message is displayed when that program element is compiled Here is a short example:

// Demonstrate the Obsolete attribute using System; class Test { [Obsolete("Use MyMeth2, instead")] public static int MyMeth(int a, int b) { return a / b; } // Improved version of MyMeth public static int MyMeth2(int a, int b) { return b == 0 0 : a /b; } static void Main() { // Warning displayed for this ConsoleWriteLine("4 / 3 is " + TestMyMeth(4, 3)); // No warning here ConsoleWriteLine("4 / 3 is " + TestMyMeth2(4, 3)); } }

When the call to MyMeth( ) is encountered in Main( ) when this program is compiled, a warning will be generated that tells the user to use MyMeth2( ) instead A second form of Obsolete is shown here: [Obsolete( message , error)] Here, error is a Boolean value If it is true, then use of the obsolete item generates a compilation error rather than a warning The difference is, of course, that a program containing an error cannot be compiled into an executable program

(cos x)2 + (sin x)2 1 = = (sec x)2 2 (cos x) (cos x)2