- The C++ programming technique allows defining user defined datatypes through the structure. A structure can implement any number of interfaces. In C, a structure declaration can be placed inside another structure. What is structure in C language? Structure is a user defined data type. We use struct keyword to declare a structure. All the structure elements are stored at contiguous memory locations. Structure in c is a user-defined data type that enables us … How to declare a structure? C Structure within Structure. This is also known as nesting of structure. In this article, we show you the difference between Structures and Union in C Programming with example. The declaration is same as the declaration of data type in structure. Let us declare a student structure containing three fields i.e. … Structure and Union are similar in syntax with keyword differences. Structures provide better performance. A structure can not derive/inherit from any structure or class. It facilitates you to design your custom data type. A structure can contain variables, methods, static constructor, parameterized constructor, operators, indexers, events, and property. Structures in C, is an advance and most popular topic in C language. Creating Structure variable and Union variable to access their respective members is the same with keyword difference. - It is used to represent a record. What is Structure. The C Programming language has many data structures like an array, stack, queue, linked list, tree, etc. You can define a union with many members, but only one member can contain a value at any given time. It is a collection of different types combined together to create a new type. Structure is a user-defined data type in C programming language that combines logically related data items of different data types together. Structure within structure (or) nesting of structure is used to create complex records. C provides you with an additional and simpler approach where you can use a special data structure, i.e., structure, in which, you can group all the information of different data type regarding an entity. A union is a special data type available in C that allows to store different data types in the same memory location. If you want to access structure members in C, structure … 'Struct' keyword is used to create a structure. Unions provide an efficient way of using the same memory location for multiple-purpose. A programmer selects an appropriate data structure and uses it according to their convenience. - The 'struct' keyword is used for declaring a structure. Data Structures in C are used to store data in an organised and efficient manner. In lines 20-24, an array of structure called companies of type struct company is declared and initialized.. In line 15, the prototype of function print_struct() is declared which accepts an argument of type array of structures.. 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