Published on: 12th Nov 2010    |   Last Updated on: 24th Nov 2011

Difference Between Stucture and Union :


Structure Union
i. Access Members     
We can access all the members of structure at anytime. Only one member of union can be accessed at anytime.
ii. Memory Allocation     
Memory is allocated for all variables. Allocates memory for variable which variable require more memory.
iii. Initialization     
All members of structure can be initialized Only the first member of a union can be initialized.
iv. Keyword     
'struct' keyword is used to declare structure. 'union' keyword is used to declare union.
v. Syntax     
struct struct_name
{
    structure element 1;
    structure element 2;
	----------
	----------
    structure element n;
}struct_var_nm;
union union_name
{
    union element 1;
    union element 2;
	----------
	----------
    union element n;
}union_var_nm;
vi. Example     
struct item_mst
{
    int rno;
    char nm[50];
}it;
union item_mst
{
    int rno;
    char nm[50];
}it;

Fig.: Difference between Structure and Union



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