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union | Keyword |
Keyword Index |
Groups variables which share the same storage space.
A union is similar to a struct, except it allows you to define variables that share storage space. The syntax for defining unions is:
union [union-type-name] { type variable-names; ... } [union-variables] ;For example,
union short_or_long { short i; long l; } a_number;The compiler will allocate enough storage in a number to accommodate the largest element in the union. Elements of a union are accessed in the same manner as a struct.
'a_number.i'
and 'a_number.l'
occupy the same
location in memory. Thus, writing into one will overwrite the other.