Structures.User-defined
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  • What you'll learn
    • ✓Structure Data type in C++ | What is a Structure datatype?
    ✓What are user-defined Data structures?
    ✓What are all the user-defined data types in C++?
    ✓How to take user input in structure in C++?
    ✓What is the difference between built-in and user-defined data structure?
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  • What are C++ data structures? Data structures are formats used to organize, store, and manage data. You can use data structures to access and modify data efficiently. There are various types of data structures. The type you use will depend on the application you're using.
  • To create a structure, use the struct keyword and declare each of its members inside curly braces.
  • The general syntax for a struct declaration in C is: struct tag_name { type member1; type member2; /* declare as many members as desired, but the entire structure size must be known to the compiler. */ }; Here tag_name is optional in some contexts.
  • There are six user-defined types: Distinct type. Structured type. Reference type.
  • C allows users or programmers to create their own user-defined functions. In User-defined functions, the user can give any name to the functions except the name of keywords; therefore, it follows three main parts: function declaration, function definition, and function call.
  • Data types are means to identify the type of data and associated operations of handling it. improve. In C++ datatypes are used to declare the variable. There are three types of data types: Pre-defined DataTypes Derived Data Types User-defined DataTypes
  • The data types that are defined by the user are called the derived datatype or user-defined derived data type. These types include: Class Structure Union Enumeration Typedef
  • It is a user-defined data type, which holds its own data members and member functions, which can be accessed and used by creating an instance of that class. A class is like a blueprint for an object. #include <bits/stdc++.h> using namespace std; class Geeks { // Access specifier public: // Data Members string geekname; // Member Functions() void printname() { cout << "Geekname is: " << geekname; } }; int main() { // Declare an object of class geeks Geeks obj1; // accessing data member obj1.geekname = "GeeksForGeeks"; // accessing member function obj1.printname(); return 0; }
  • A Structure is a user-defined data type in C/C++. A structure creates a data type that can be used to group items of possibly different types into a single type. Syntax struct structName{ char varName[size]; int varName; };
  • #include <iostream> using namespace std; // Declaration of union is same as the structures union test { int x, y; }; int main() { // A union variable t union test t; // t.y also gets value 2 t.x = 2; cout << "After making x = 2:" << endl << "x = " << t.x << ", y = " << t.y << endl; // t.x is also updated to 10 t.y = 10; cout << "After making Y = 10:" << endl << "x = " << t.x << ", y = " << t.y << endl; return 0; } Output After making x = 2: x = 2, y = 2 After making Y = 10: x = 10, y = 10 Explanation: The above program demonstrates the use of unions. Union named “test” with integer members x and y is defined, here x and y shares the same memory space. In the main function value of x is set to 2 and then printed. Later, it updates y to 10 and the value of x is also updated to 10, this shows the shared memory characteristic of unions.

Requirement

A Structure is a user-defined data type in C/C++ that is used to store similar, different data types or a combination of both under a single variable. Unlike Array, a Structure is used to store a collection of different types of data elements under a single variable name.

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