What is union how data stored using union?

Difference between structure and union in C: C StructureC UnionWe can access all members of structure at a time.We can access only one member of union at a time.Structure example: struct student { int mark; char name[6]; double average; };Union example: union student { int mark; char name[6]; double average; };C Union with examples – Fresh2Refresh fresh2refresh.com › C Programming Tutorial

A structure contains an ordered group of data objects . Unlike the elements of an array, the data objects within a structure can have varied data types. Each data object in a structure is a member or field. A union is an object similar to a structure except that all of its members start at the same location in memory.

Advertisements. A union is a special data type available in C that allows to store different data types in the same memory location . You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purpose …

Struct keyword is used to create structures in C programming. Structures in C are used to group different data types to organize the data in a structural way. For example, we are storing employee details such as name, id, age, address, and salary. From the names, you can understand that they are not the same data type.

C Union Syntax It is the system reserved keyword used to create and accessing its members . The UName is the name you want to give for this. For example, employees, persons, students. Data_Type means Data type of the variable that you want to declare. For example, int, float, char, etc.

The first one is stored at the beginning of the struct, the second is stored after that, and so on . Unions only allocate enough space to store the largest field listed, and all fields are stored at the same space . Syntax for declaring a union is same as that of declaring a structure except the keyword struct.

We use the union keyword to define unions. Here’s an example: union car { char name[50]; int price; }; The above code defines a derived type union car .