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Initializing a Union

It is possible to initialize a union. Yet, unlike struct initialization, the initialization list of a union must contain a single initializer that refers to the first member in the union:

 union Key {   int num_key;  void *ptr_key;  char  name_key[10];};Key a_key = {5}; //first member of Key is of type int; all other bytes are initialized to binary zeroes

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