Difference Between Structure 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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