c# data matrix barcode The arrays are equal using element-by-element comparison. in Visual C#

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The arrays are equal using element-by-element comparison.
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Parameter Arrays
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Variable argument lists are necessary whenever a function needs to handle an unknown number of optional parameters, such as an I/O function that will be passed an unknown number of variables. An array is used for these parameters, and a special syntax is used for such functions, as in Listing 5-33. Listing 5-33. Using Parameter Arrays // param_array.cpp using namespace System;
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CHAPTER 5 FUNDAMEN TA L TYPES: STRING S, A RRAY S, A ND ENUM S
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// Total takes at least one int and a variable // number of subsequent integers that are wrapped // into a managed array. int Total( int a, ... array<int>^ varargs) { int tot = a; for each ( int i in varargs) { tot += i; } return tot; } int main() { int sum1 = Total(100, 200, 350); Console::WriteLine("First total: {0}", sum1); int sum2 = Total(1, 2, 3, 4, 5, 6, 7, 8); Console::WriteLine("Second total: {0}", sum2); } The output of Listing 5-33 is shown here: First total: 650 Second total: 36
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Arrays are often used as private data inside a class. Usually you will want to control access to your internal array to make sure the data it contains retains integrity. It s a bad idea to return an internal instance of an array. If you do, you lose control over the data in your array. You may also want to create a class that can be used as an array. In classic C++, you could define the indirection operator (operator[]). In C++/CLI, you can still do that, and you can also use what s called a default indexed property, which you ll learn more about in 7.
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Beyond Arrays: ArrayList
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There are times when a fixed-size array will not meet your needs. Similarly, there are times when you need a data structure that you can insert items into or delete items from. Inserting and deleting items in the middle of an array is not possible without moving all the subsequent elements. For efficient deletion and insertion, use an ArrayList (see Listing 5-34). An ArrayList is like an array that supports list-like functionality. An ArrayList can grow to an undetermined length as needed.
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C HA PTER 5 FUNDA MENTAL TYPES : STRINGS , ARRA YS , AN D E NUMS
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Listing 5-34. Using an ArrayList // arraylist.cpp using namespace System; using namespace System::Collections; int main() { ArrayList^ array_list = gcnew ArrayList(); array_list->Add("apple"); array_list->Add("banana"); // Iterate using the for each operator. for each (String^ s in array_list) { Console::WriteLine( s ); } // Iterate using indexing. for (int i = 0; i < array_list->Count; i++) { Console::WriteLine("{0} {1}", i, array_list[i]); } } The output of Listing 5-34 is as follows: apple banana 0 apple 1 banana The problem with the ArrayList class is that it represents an untyped collection, or, more accurately, a collection typed only to Object. Unlike an array, which forces its elements to be of the specified type, the ArrayList used in the previous example has no such enforcement. Fortunately, there is a solution in the form of the generic ArrayList class. As you saw briefly in 2, it is possible in C++/CLI to use a generic class that contains an unknown type parameter. In the .NET Framework generic List class, in the namespace System::Collections:: Generic, the element type is the generic type parameter. Using this generic List class, you can have a strongly typed version of the ArrayList (see Listing 5-35). For more information on generics, see 11.
CHAPTER 5 FUNDAMEN TA L TYPES: STRING S, A RRAY S, A ND ENUM S
Listing 5-35. Using a Generic List // list_generic.cpp using namespace System; using namespace System::Collections::Generic; int main() { List<String^>^ list = gcnew List<String^>(); list->Add("apple"); list->Add("banana"); // Iterate using the for each operator. for each (String^ s in list) { Console::WriteLine( s ); } // Iterate using indexing. for (int i = 0; i < list->Count; i++) { Console::WriteLine("{0} {1}", i, list[i]); } } The output of Listing 5-35 is also apple banana 0 apple 1 banana The preceding sections reviewed the classic C++ array and compared that construct to the new C++/CLI array construct. You saw the syntax for creating and initializing arrays, and learned about copying arrays, using arrays as parameters and return values, and the usefulness of some of the functionality that C++/CLI arrays inherit from System::Array, including sorting and searching. Next, you ll get a look at another fundamental .NET type used in C++/CLI the Enum type (represented by System::Enum).
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