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Quoting cplusplus.com. Note that neither typedef nor using create new distinct data types.They only create synonyms of existing types. That means that the type of myword above, declared with type WORD, can as well be considered of type unsigned int; it does not really matter, since both are actually referring to the same type. Struct atau record adalah kumpulan data yang memiliki tipe data yang berbeda. Secara pendeklarasian, struct sangat berbeda dengan array yang hanya memiliki satu buah tipe data untuk setiap kumpulannya. Struct digunakan apabila data yang ingin dikelompokkan memiliki tipe data yang berbeda. Pendeklarasian st.

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C/C++ arrays allow you to define variables that combine several data items of the same kind, but structure is another user defined data type which allows you to combine data items of different kinds.

Structures are used to represent a record, suppose you want to keep track of your books in a library. You might want to track the following attributes about each book −

Title
Author
Subject
Book ID

Defining a Structure

To define a structure, you must use the struct statement. The struct statement defines a new data type, with more than one member, for your program. The format of the struct statement is this −

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The structure tag is optional and each member definition is a normal variable definition, such as int i; or float f; or any other valid variable definition. At the end of the structure's definition, before the final semicolon, you can specify one or more structure variables but it is optional. Here is the way you would declare the Book structure −

Accessing Structure Members

To access any member of a structure, we use the member access operator (.). The member access operator is coded as a period between the structure variable name and the structure member that we wish to access. You would use struct keyword to define variables of structure type. Following is the example to explain usage of structure −

When the above code is compiled and executed, it produces the following result −

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Structures as Function Arguments

You can pass a structure as a function argument in very similar way as you pass any other variable or pointer. You would access structure variables in the similar way as you have accessed in the above example −

When the above code is compiled and executed, it produces the following result −

Pointers to Structures

You can define pointers to structures in very similar way as you define pointer to any other variable as follows − Auto tune 8 vocal studio.

Now, you can store the address of a structure variable in the above defined pointer variable. To find the address of a structure variable, place the & operator before the structure's name as follows −

To access the members of a structure using a pointer to that structure, you must use the -> operator as follows −

Let us re-write above example using structure pointer, hope this will be easy for you to understand the concept −

When the above code is compiled and executed, it produces the following result −

The typedef Keyword

There is an easier way to define structs or you could 'alias' types you create. For example −

Now, you can use Books directly to define variables of Books type without using struct keyword. Following is the example −

You can use typedef keyword for non-structs as well as follows −

x, y and z are all pointers to long ints.

Data structures

A data structure is a group of data elements grouped together under one name. These data elements, known as members, can have different types and different lengths. Data structures can be declared in C++ using the following syntax:

struct type_name {
member_type1 member_name1;
member_type2 member_name2;
member_type3 member_name3;
.
.
} object_names;

Where type_name is a name for the structure type, object_name can be a set of valid identifiers for objects that have the type of this structure. Within braces {}, there is a list with the data members, each one is specified with a type and a valid identifier as its name.
For example:
This declares a structure type, called product, and defines it having two members: weight and price, each of a different fundamental type. This declaration creates a new type (product), which is then used to declare three objects (variables) of this type: apple, banana, and melon. Note how once product is declared, it is used just like any other type.
Right at the end of the struct definition, and before the ending semicolon (;), the optional field object_names can be used to directly declare objects of the structure type. For example, the structure objects apple, banana, and melon can be declared at the moment the data structure type is defined:

In this case, where object_names are specified, the type name (product) becomes optional: struct requires either a type_name or at least one name in object_names, but not necessarily both.
It is important to clearly differentiate between what is the structure type name (product), and what is an object of this type (apple, banana, and melon). Many objects (such as apple, banana, and melon) can be declared from a single structure type (product).
Once the three objects of a determined structure type are declared (apple, banana, and melon) its members can be accessed directly. The syntax for that is simply to insert a dot (.) between the object name and the member name. For example, we could operate with any of these elements as if they were standard variables of their respective types:
Each one of these has the data type corresponding to the member they refer to: apple.weight, banana.weight, and melon.weight are of type int, while apple.price, banana.price, and melon.price are of type double.
Here is a real example with structure types in action:

The example shows how the members of an object act just as regular variables. For example, the member yours.year is a valid variable of type int, and mine.title is a valid variable of type string.
But the objects mine and yours are also variables with a type (of type movies_t). For example, both have been passed to function printmovie just as if they were simple variables. Therefore, one of the features of data structures is the ability to refer to both their members individually or to the entire structure as a whole. In both cases using the same identifier: the name of the structure.
Because structures are types, they can also be used as the type of arrays to construct tabl

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