Web Reference: Dec 27, 2024 · The below table lists the primary differences between the C structures and unions: A structure is a user-defined data type that groups different data types into a single entity. A union is a user-defined data type that allows storing different data types at the same memory location. Structures and unions in C programming are user-defined data types that are used for storing different types of data together in a single block defined with curly braces {}. The main difference between a structure and a union is in the way they store and manage memory for their members. 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.
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