This document discusses arrays in C++. It begins by introducing arrays and their need, then describes the different types of arrays including single, two, and multi-dimensional arrays. It explains how arrays are stored in contiguous memory locations and indexed starting from zero. The document also covers array initialization, unsized array initialization, and using strings as arrays in C++.

1. ARRAY
IN
C++

2.  Introduction to Array
 Need of Array
 Types of Array
 Single dimensional
 Two dimensional
 Multi dimensional
 Array initialization
 Unsized Array initialization
 String as an array
Contents

3. Array is a collection of variables that can hold
value of same type and reference by common
name .Its is a derived data Structure
Array are always stored in a continuous memory locations.
An Array either be a integer ,character, or float base type
(Data type of array) .
Array indexing is always start from zero and highest address
corresponds to last element
Introduction

4. Num [0]
Num[1]
Num[2]
Num[3]
Num[4]
Num[5]
Int num [6]
Base type of
arrray
Name
of array
Size of
array
Continuous
memory
allocation of
array

5. To store processed large number of variables of same
data type and reference/name
Easy understanding of program
Example: Marks
0
1
2
3
4
5
Need ofArrray

6. One dimensional
Two dimensional
Multi dimensional
Types ofArray

7. A one dimensional array is one in which one
subscript /indices specification is needed to
specify a particular element of array
Declaration :
Data_type array_name [size of array ];
Eg:
Int num[10];
1-D Array

8. num[0] num[1] num[2] num[3] num[4] num[5] num[6] num[7] num[8] num[9]
2000 2002 2004 2006 2008 2010 2012 2014 2016 2018
starting Address of location
Total memory in bytes that an array is occupied :
Size of array=size of array*size of(base type)
Hear,
10*2=20
39 56 23 98 6 56 09 2 54 67
Memory representation:

9. A 2-d array is an array in which each element is itself
an array
i.e int num[4][3]
0 1 2
0
1
2
3
2-D Array
No of
rows
No of
columns
Num [2][1]
No of element in
2-D array =M*N

10. Total bytes= no of rows*no of columns*size of(base
type)
Memory reprsentation in 2-D array:
char A [2][3]
A[0][0] A[0][1] A[0][2] A[1][0] A[1][1] A[1][2]
5001 5002 5003 5004 5005 5006
size of 2-D array

11. An array with dimensions more than two .The
maximum limit of array is compiler dependent
Declration:
Data_type name [a][b][c][d][e][f]…….[n];
Array of 3 or more dimensional are not often
use because of huge memory requirement
and complexity involved
Multi dimensionalarray

12. C++ provides the facility of array initialization at the time of
declaration .General form of array initialization is as:
Type array_name[size 1]…..[size N] ={vale list};
Eg:
Int days_month[12]={31,25,29,03,31,19,20,31,18,20,31,29};
Char string[6]={‘a’,’r’,’g’,’y’,’d’,’0’};
2-D array are also initialized in same way as linear array
Int cube[4][2]={ 1,3,
4,6,
9,37,
5,78
};
Arrayinitialization

13. C++ allowed you to skip the size of array in an array initialization
statement C++ automatically create an array big enough to hold
all the initializers present
Char S1[] =“ first string ”;
you skip the size, you must give list of initializers so that C++
can calculate the size of array
Int val []={3,5,6,2,8,9,6,4};
Int cube [] [2] ={ 1,3,
67,7,
6,87,
};
Unsizedarrayinitializations

14. C++ does not have a String data type ,it
impairments string as 1-D character Arrray .A
string as a character array is terminate by a
null character ‘0’
Char str 1 [11];
Char square [][]={ ‘first string’,
‘second string’,
‘third string’
};
String as array

15. Thank you