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foreach(type loopvar in collection) statement; Here, type loopvar specifies the type and name of an iteration variable The iteration variable receives the value of the next element in the collection each time the foreach loop iterates The collection being cycled through is specified by collection, which, for the rest of this discussion, is an array Thus, type must be the same as (or compatible with) the element type of the array Beginning with C# 30, type can also be var, in which case the compiler determines the type based on the element type of the array This can be useful when working with certain queries, as described later in this book Normally, you will explicitly specify the type Here is how foreach works When the loop begins, the first element in the array is obtained and assigned to loopvar Each subsequent iteration obtains the next element from the array and stores it in loopvar The loop ends when there are no more elements to obtain Thus, the foreach cycles through the array one element at a time, from start to finish One important point to remember about foreach is that the iteration variable loopvar is read-only This means you can t change the contents of an array by assigning the iteration variable a new value Here is a simple example that uses foreach It creates an array of integers and gives it some initial values It then displays those values, computing the summation in the process

// Use the foreach loop using System; class ForeachDemo { static void Main() { int sum = 0; int[] nums = new int[10]; // Give nums some values for(int i = 0; i < 10; i++) nums[i] = i; // Use foreach to display and sum the values foreach(int x in nums) { ConsoleWriteLine("Value is: " + x); sum += x; } ConsoleWriteLine("Summation: " + sum); } }

By default, enumerations are based on type int, but you can create an enumeration of any integral type, except for type char To specify a type other than int, put the underlying type after the enumeration name, separated by a colon For example, this statement makes Coin an enumeration based on byte:

11:

enum Coin : byte { Penny, Nickel, Dime, Quarter, HalfDollar, Dollar};

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WriteLine( ) Many classes override this method Doing so allows them to tailor a description specifically for the types of objects that they create For example:

// Demonstrate ToString() using System; class MyClass { static int count = 0; int id; public MyClass() { id = count; count++; } public override string ToString() { return "MyClass object #" + id; } } class Test { static void Main() { MyClass ob1 = new MyClass(); MyClass ob2 = new MyClass(); MyClass ob3 = new MyClass(); ConsoleWriteLine(ob1); ConsoleWriteLine(ob2); ConsoleWriteLine(ob3); } }

1 One interface, multiple methods is a key tenet of C# What feature best exemplifies it 2 How many classes can implement an interface How many interfaces can a class

The output from the program is shown here:

MyClass object #0 MyClass object #1 MyClass object #2

The only verb, went, goes with the subject you Therefore, whom is correct, as it serves as the object of the preposition with 5 The mayor, as well as his deputies, a success says the initiative was

3 Can interfaces be inherited 4 Must a class implement all of the members of an interface 5 Can an interface declare a constructor 6 Create an interface for the Vehicle class from 8 Call the interface IVehicle

As explained, all C# types, including the value types, are derived from object Thus, a reference of type object can be used to refer to any other type, including value types When an object reference refers to a value type, a process known as boxing occurs Boxing causes the value of a value type to be stored in an object instance Thus, a value type is boxed inside an object This object can then be used like any other object In all cases, boxing occurs automatically You simply assign a value to an object reference C# handles the rest Unboxing is the process of retrieving a value from a boxed object This action is performed using an explicit cast from the object reference to its corresponding value type Attempting to unbox an object into a different type will result in a runtime error

Part I:

(Hint: The properties will need to support both read and write operations, and cannot have accessor access modifiers)

Here is a simple example that illustrates boxing and unboxing:

from 7 (Hint: The Length property must be read-only and cannot be autoimplemented)

// A simple boxing/unboxing example using System; class BoxingDemo { static void Main() { int x; object obj; x = 10; obj = x; // box x into an object int y = (int)obj; // unbox obj into an int ConsoleWriteLine(y); } }

This program displays the value 10 Notice that the value in x is boxed simply by assigning it to obj, which is an object reference The integer value in obj is retrieved by casting obj to int Here is another, more interesting example of boxing In this case, an int is passed as an argument to the Sqr( ) method, which uses an object parameter

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