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Array In

C++

 

Array:

An Array is a collection of same type elements in contiguous memory location that can be access by using index of array. Arrays are used to store the data of same datatype. There are arrays of integer, char, double, float, and even of bool. And the most important thing that need to be remember, indexing in C++ is always start from 0.

Syntax:

Datatype arrayName [arraySize];

 

Array of Integers:

Addresses	0x2600	0x2604	0x2608	0x260c	0x2610	0x2614	0x2618	0x261c	0x2620
Values	40	99	61	10	36	12	2	6	52
INDICES	0	1	2	3	4	5	6	7	8

 

The first row shows the address of Array and the second row show the values stored the array. And the last row shows the indexing of array. The size of array is 9. In C++ the index of first element of any array is always 0.

Array of Integers:

Addresses	0x2600	0x2604	0x2608	0x260c	0x2610	0x2614	0x2618	0x261c	0x2620
Values	40	99	61	10	36	12	2	6	52
INDICES	0	1	2	3	4	5	6	7	8

 

The first row shows the address of Array and the second row show the values stored the array. And the last row shows the indexing of array. The size of array is 9.

 

Array of Char:

Addresses	0x1111	0x1112	0x1113	0x1114	0x1115	0x1116	0x1117	0x1118	0x1119
Values	P	R	o	T	e	a	C	h	\0
INDICES	0	1	2	3	4	5	6	7	8

 

In case of character array, compiler add the null in end of array automatically, because the delimiter of char array is null. It’s a convention, the end of the strings in character sequence there is a null. If we make an array of 9 elements of char datatype and store only 3 char elements in it than there is null at third index of array and on remaining indices there is garbage value.

Addresses	0x1111	0x1112	0x1113	0x1114	0x1115	0x1116	0x1117	0x1118	0x1119
Values	P	R	o	\0	garbage	garbage	garbage	garbage	Garbage
INDICES	0	1	2	3	4	5	6	7	9

 

 

Example1:

Output:

Example2:

Output:

 

Example3:

Output:

 

Example4:

Output: