C-Programming Objective Questions on Structures, Unions, Enums

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• A structure in C programming language is a structured (record) typethat aggregates a fixed set of labelled objects, possibly of different types, into a single object.

struct account {
   int account_number;
   char *first_name;
   char *last_name;
   float balance;
};

• In computer science, a union is a value that may have any of several representations or formats; or it is a data structure that consists of a variable which may hold such a value. 

union {
      int d;
      char f;
   }; 

•  In computer programming, an enumerated type (also called enumeration or enum, or factor in the R programming language, and a categorical variable in statistics) is a data type consisting of a set of named values called elements, members or enumerators of the type. 

For example, the four suits in a deck of playing cards may be four enumerators named CLUB, DIAMOND, HEART, SPADE, belonging to an enumerated type named suit.  

    suit: (clubs, diamonds, hearts, spades);

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