What is union vs struct?

Union is an user defined datatype in C programming language . It is a collection of variables of different datatypes in the same memory location. We can define a union with many members, but at a given point of time only one member can contain a value.

A union is an object similar to a structure except that all of its members start at the same location in memory . A union variable can represent the value of only one of its members at a time. In C++, structures and unions are the same as classes except that their members and inheritance are public by default.

Unions provide an efficient way of using the same memory location for multiple purposes. Both are user-defined data types used to store data of different types as a single unit. Their members can be objects of any type, including other structures and unions or arrays .12 Eyl 2021

A struct is a block of memory that stores several data objects, where those objects don’t overlap. A union is a block of memory that stores several data objects , but has only storage for the largest of these, and thus can only store one of the data objects at any one time.

A structure can be nested inside a union and it is called union of structures. It is possible to create a union inside a structure.12 Mar 2021

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 …