Web Reference: Oct 25, 2025 · A union is a user-defined data type that can hold different data types, similar to a structure. Unlike structures, all members of a union are stored in the same memory location. We use the unionkeyword to define unions. Here's an example: The above code defines a derived type union car. Aug 29, 2011 · Unions are particularly useful in Embedded programming or in situations where direct access to the hardware/memory is needed. Here is a trivial example: unsigned char byte2; unsigned char byte3; unsigned char byte4;
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