Question

Comparison between array and structure.

Answer 1

Sr. No.	Key	Structure	Array
1	Definition	Structure can be defined as a data structure used as container which can hold variables of different types.	On other hand Array is a type of data structure used as container which can hold variables of same type and do not support multiple data type variables.
2	Memory Allocation	Memory allocation for input data in structure does not necessary to be in consecutive memory location.	While in case of array the input data stored in contiguous memory allocation which implies that array stores data in such memory model where it assigns consecutive memory blocks (that is, memory blocks having consecutive addresses).
3	Accessibility	In order to access the element in Structure we require to have the name of that element i.e it is mandatory to have element name for its retrieval from Structure.	On other hand in case of Array we can access the element by index.
4	Pointer	Structure do not have concept of Pointer internally.	On other hand in case of Array it internally implements Pointer which always points to the first element of Array.
5	Instantiation	Structure object can be created after declaration later in the program.	On other hand in case of Array we can’t create its object after declaration.
6	DataType	Structure supports multiple data-type variables as input.	On other hand in case of Array we can’t have different data-type variable as input as it only supports same type data variables.
7	Performance	Structure due to use defined data type become slow in performance as access and searching of element is slower in Structure as compare to Array.	On other hand in case of Array access and searching of element is faster and hence better in performance.