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UNION

UNION. popo. Union. Union is same as the structure Like structure, union also contains members of different data type Union can be declared using the keyword union Syntax: union unionname { member 1; member 2; . . . .

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UNION

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  1. UNION popo

  2. Union • Union is same as the structure • Like structure, union also contains members of different data type • Union can be declared using the keyword union • Syntax: union unionname{ • member 1; • member 2; • . . . . • }; • Like structure a union variable can be declare • Syn: union unionname variable list; • popo

  3. Union and Structure • The memory space occupy for a union variable is the size of largest member • In structure each members has its own memory locations • In union all members shares a common memory location • In structure we can access all members at a time • In union we can access only one member at a time • popo

  4. Union and Structure • Eg • Stuct check • { int age; char name[5]; • }s; • The memory space of struct variable s=sum of size of all members • Iesizeof(age)+sizeof(name) • => 2+5 = 7 bytes • The structure variable has separate memory locations for each members • Can access all members at a time • popo

  5. Union and Structure • Eg • union check • { int age; char name[5]; • }u; • The memory space of union variable s=size of largest members • Iesizeof(name) • => 5 = 5 bytes • The union variable has only one memory locations for all members • Can access only one member at a time • popo

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