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Iostream.h Dev C%2b%2b

 

Iostream.h adalah file header C yang terdapat pada compiler Turbo C dan Borland C. File header tersebut ada sebelum standardisasi C tahun 1998 dan tidak tersedia di semua platform. Kemudian sejak standar C dibuat pada tahun 1998, file header iostream-lah (tanpa ekstensi “.h”) yang digunakan sedangkan iostream.h sudah dianggap. I seem to recall I had to include iostream.h to use the CString class. Do I have that right? You need to create an MFC program or a console program that supports MFC. The IDE will generate the files with necessary includes, such as afx.h. 1) There is no relationship between CString and iostream. Iostream.h problem. C / C Forums on Bytes. By using this site. As to the iostream issues, I'm not sure if Dev-C actually comes with the headers.

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Beberapa orang, terutama yang belajar bahasa pemrograman di kuliah atau sekolah, biasanya menggunakan aplikasi DEV C 5.11 atau seri di atasnya. Tapi ada juga perusahaan gaming atau software yang menggunakan aplikasi IDE Visual Studio 2015 dan update-an ke atasnya. Atom adalah aplikasi text editor yang sifatnya open source.

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Consider a situation, when we have two persons with the same name, Zara, in the same class. Whenever we need to differentiate them definitely we would have to use some additional information along with their name, like either the area, if they live in different area or their mother’s or father’s name, etc.

Same situation can arise in your C++ applications. For example, you might be writing some code that has a function called xyz() and there is another library available which is also having same function xyz(). Now the compiler has no way of knowing which version of xyz() function you are referring to within your code.

A namespace is designed to overcome this difficulty and is used as additional information to differentiate similar functions, classes, variables etc. with the same name available in different libraries. Using namespace, you can define the context in which names are defined. In essence, a namespace defines a scope.

Defining a Namespace

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A namespace definition begins with the keyword namespace followed by the namespace name as follows −

To call the namespace-enabled version of either function or variable, prepend (::) the namespace name as follows −

Let us see how namespace scope the entities including variable and functions −

If we compile and run above code, this would produce the following result −

The using directive

You can also avoid prepending of namespaces with the using namespace directive. This directive tells the compiler that the subsequent code is making use of names in the specified namespace. The namespace is thus implied for the following code −

If we compile and run above code, this would produce the following result −

The ‘using’ directive can also be used to refer to a particular item within a namespace. For example, if the only part of the std namespace that you intend to use is cout, you can refer to it as follows −

Subsequent code can refer to cout without prepending the namespace, but other items in the std namespace will still need to be explicit as follows −

If we compile and run above code, this would produce the following result −

Names introduced in a using directive obey normal scope rules. The name is visible from the point of the using directive to the end of the scope in which the directive is found. Entities with the same name defined in an outer scope are hidden.

Discontiguous Namespaces

A namespace can be defined in several parts and so a namespace is made up of the sum of its separately defined parts. The separate parts of a namespace can be spread over multiple files.

So, if one part of the namespace requires a name defined in another file, that name must still be declared. Writing a following namespace definition either defines a new namespace or adds new elements to an existing one −

Nested Namespaces

Namespaces can be nested where you can define one namespace inside another name space as follows −

Iostream.h Dev C 2b 2b Test

You can access members of nested namespace by using resolution operators as follows −

In the above statements if you are using namespace_name1, then it will make elements of namespace_name2 available in the scope as follows −

Iostream.h Dev C 2b 2b 2c

If we compile and run above code, this would produce the following result − The how of happiness pdf.

Iostream.h Dev C 2b 2b +