Introduction to Array ppt

 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

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

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

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

One dimensional
Two dimensional
Multi dimensional
Types ofArray

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

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:

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

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

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

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

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

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

Introduction to Array ppt

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Introduction to Array ppt