Difference Between Array and Stucture

Array	Structure
i. Data Collection
Array is a collection of homogeneous data.	Stucture is a collection of heterogeneous data.
ii. Element Reference
Array elements are referred by subscript.	Structure elements are referred by its unique name.
iii. Access Method
Array elements are accessed by it's position or subscript.	Stucture elements are accessed by its object as '.' operator.
iv. Data type
Array is a derived data type.	Structure is user defined data type.
v. Syntax
<data_type> array_name[size];	struct struct_name {     structure element 1;     structure element 2;  ----------  ----------  structure element n; }struct_var_nm;
vi. Example
int rno[5];	struct item_mst {     int rno;     char nm[50]; }it;

Similer…..
Java AND C++	Oracle and MY SQL
C++ and C#	C And C++
Asp and Jsp	ASP AND ASPX
Array and Stucture	Stucture and Union
Ajax And DHTML	Ajax And JQuery
Ajax AND JavaScript	Black Box Testing and White Box Testing
HTTP And HTTPS	GET And POST

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;

Similer..........
Java AND C++	Oracle and MY SQL
C++ and C#	C And C++
Asp and Jsp	ASP AND ASPX
Array and Stucture	Stucture and Union
Ajax And DHTML	Ajax And JQuery
Ajax AND JavaScript	Black Box Testing and White Box Testing
HTTP And HTTPS	GET And POST