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Define union. Compare structure and union. When is union preferred over struct?

written 5.7 years ago by teamques10 ★ 68k

•   modified 5.7 years ago

Subject : Structured Programming Approach

Title : Arrays, String, Structures and Union

Difficulty : Medium

structured programming approach

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written 5.7 years ago by teamques10 ★ 68k

Union: A unionis a special data type available in C that allows storing different data types in the same memory location.

Parameter	Structure	Union
Keyword	The keyword ‘struct’ is used to define a structure.	The keyword ‘union’ is used to define a union.
Size	When a variable associated with a structure, the compiler allocates the memory for each member. The size of structure is greater than or equal to the sum of sizes of its members.	When a variable associated with a union, the compiler allocates the memory by considering the size of the largest memory. Hence, The size of union is equal to the size of largest members.
Memory	Each member within a structure is assigned and unique storage area of location.	Memory allocated is shared by individual members of union.
Value Altering	Altering the value of a member will not affect other members of the structure.	Altering the value of any of the member will alter other member values.
Accessing members	Individual member can be accessed at a time	.Only one member can be accessed at a time.
Initializing Members	Several members of a structure can initialize at once.	Only the first member of a union can be initialized.

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