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8 How does a struct differ from a class 9 Show how to create an enumeration for the planets Call the enumeration Planets

// Boxing also occurs when passing values using System; class BoxingDemo { static void Main() { int x; x = 10; ConsoleWriteLine("Here is x: " + x); // x is automatically boxed when passed to Sqr() x = BoxingDemoSqr(x); ConsoleWriteLine("Here is x squared: " + x); } static int Sqr(object o) { return (int)o * (int)o; } }

The output from the program is shown here:

Exception handling fundamentals try and catch Multiple catch clauses Nested try blocks Throw an exception The Exception class finally The built-in exceptions Custom exception classes checked and unchecked

The subject of the sentence is mayor, a singular noun Eliminate the phrase as well as his deputies to con rm that the correct choice is says 6 Neither the conductor nor the pianist schedule change is aware of the

Here is x: 10 Here is x squared: 100

Here, the value of x is automatically boxed when it is passed to Sqr( ) Boxing and unboxing allow C# s type system to be fully unified All types derive from object A reference to any type can be assigned to a variable of type object Boxing and

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his chapter discusses exception handling An exception is an error that occurs at runtime Using C# s exception-handling subsystem, you can handle runtime errors in a structured and controlled manner A principal advantage of exception handling is that it automates much of the error-handling code that would otherwise have been entered by hand into any large program For example, without the use of exception handling, an error code would be returned by a method when it fails, and this value must be checked manually each time the method is called This approach is both tedious and error-prone Exception handling streamlines error handling by allowing your program to define a block of code, called an exception handler, that is executed automatically when an error occurs It is not necessary to manually check the success or failure of each specific operation or method call If an error occurs, it will be processed by the exception handler Another reason that exception handling is important is that C# defines standard exceptions for common program errors, such as divide-by-zero or index-out-of-range To respond to these errors, your program must watch for and handle these exceptions In the final analysis, to be a successful C# programmer means that you are fully capable of navigating C# s exception-handling subsystem

11:

In C#, exceptions are represented by classes All exception classes must be derived from the built-in exception class Exception, which is part of the System namespace Thus, all exceptions are subclasses of Exception

unboxing automatically handle the details for the value types Furthermore, because all types are derived from object, they all have access to object s methods For example, consider the following rather surprising program:

// Boxing makes it possible to call methods on a value! using System; class MethOnValue { static void Main() { ConsoleWriteLine(10ToString()); } }

One very important subclass of Exception is SystemException This is the exception class from which all exceptions generated by the C# runtime system (that is, the CLR) are derived SystemException does not add anything to Exception It simply defines the top of the standard exceptions hierarchy The NET Framework defines several built-in exceptions that are derived from SystemException For example, when a division-by-zero is attempted, a DivideByZeroException exception is generated As you will see later in this chapter, you can also create your own exception classes

This program displays 10 The reason is that the ToString( ) method returns a string representation of the object on which it is called In this case, the string representation of 10 is 10!

Given that object is a base class for all other types and that boxing of the value types takes place automatically, it is possible to use object as a universal data type For example, consider the following program that creates an array of object and then assigns various other types of data to its elements:

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