What is an union data type?

Union is a user defined data type like structure where each member elements share one overlapping memory location. Like structure, union is also user defined type to group of different type of variables of either compiler defined legacy types or other user defined types or mixed. Individual entity of a structure elemnt is called member. Size of a union is the size of a member whos size is max among others. Starting address of all member elements are same which is the starting address of the union.

Syntax:
union <name> {
  <type> <member name 1>;
  <<type> <member name 2>;
  ...

  <type> <member name N>;
};

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