Structured Data Type Arrays

WEL COME
PRAVEEN M JIGAJINNI
PGT (Computer Science)
MCA, MSc[IT], MTech[IT],MPhil (Comp.Sci), PGDCA, ADCA,
Dc. Sc. & Engg.

Reference Book
CLASS XI
By
Sumita Arora

CHAPTER 12
STRUCTURED
DATA TYPE
ARRAYS

INTRODUCTION
An array is a collection of variables
of same type that are referenced by a
common name .
C++ allows more type of data i.e its
derived data type.(integer and floating
point).

TYPES OF ARRAYS
1.SINGLE DIMENTION ARRAY
It is simplest type of array . indices
no starts with 0.
An array must be defined before it
can be used to store information . Ex.
Type array-name[size]
The data type of array elements is
known as the base type of the array.

TYPES OF ARRAYS
1.SINGLE DIMENTION ARRAY
MEMORY REPRESENTATION OF SINGLE
DIMENTION ARRAYS
Single dimension arrays are essentially
list of information of same type and stored in
contiguous memory location in their index
order. Ex .
Char grade [8];
Will have element grade[0] at first location
Grade[1] in the next position.

TYPES OF ARRAYS
.
Adderess 2000 2001 2002 20003 20004
The amount of storage required to hold
an array is directly related to its type
and size can be computed on the
following formule
Total bytes=sizeof(type)*size of array.
Grade[0] Grade[1] Grade[2] Grade[3] Grade[4]

STRING AS AN ARRAY
C++ does not have string data type
rather it implements string as a single –
dimension character array. A string is
defined as a character array that is
terminated by a null character. Ex.
To declare an character array that
hold 10 character string we would write
Char strg[11] ;

TWO DIMENSIONAL ARRAY
A two dimensional array is an array in
which each element is itself an array. Ex
An array A[m][n] is an m by n table with
m rows and n columns containing m*n table.
0 N-1
0
M-1

PROCESSING 2 D ARRAY
We use nested loops to process 2 d array. one
loop process the rows and another columns .If
outer loops is for rows and inner loop for columns
then each row index,all columns are processed
and then the same process is repeated.
int A [2] [3];
int I,j;
For(i=0;i<2;++i)
{
for (j=0;j <3 ; ++j)
{ cout<<“enter element”;
cin >> A [ i ] [ j ] ;
}
}

MEMORY REPRESENTATION
OF 2D ARRAY
Two dimension array are stored in a row
column matrix, where the first index
represents the row and second indicates the
row. This means that the second index
changes faster than first index when
accessing the elements in an array order.
The formula to calculate the total number
of bytes of two d array are:
Total bytes=no of rows *no of columns*size of base

MATRICES AS 2DARRAYS
Matrix is a set of mn numbers arranged
in a rectangular array of m rows and n
columns. Such matrix is called m by n
matrix.
int Mat [5] [4] ; //if matrix contains integers
Or
float Mat [5] [4] ;

ARRAY OF STRINGS
An array of string is a two dimensional
character array . The size of the first index
determines the number of strings and size
of second index determines maximum
length of each string.

ARRAY INITIALIZATION
C++ provides the facility of an array
initialization at the time of declaration. The
arrays are initialization in the same way as
other variable.ex .
Type array – name [size1]…..[size N]
Following code initialises an integer
array with 12 elements
Int days of months [12]={31,28,31,30,31,31,30,31,30,31}
This would place 31 is month [0]0,28 is
month [2].

ARRAY INITIALIZATION
Character arrays can be also initialized like:
Char string [10]=“program”;
Will initialize it as
Char string [10]=“{‘p’ , ‘r’ , ‘o’ , ‘g’ , ,’r’ , ‘a’ ,’m’, 0}
Two dimension will do it in:
Int cube [ 5 ] [2]= { 1 ,1,
2 , 8
3, 27
4, 68
5, 25
};

UNSIZE ARRAY
INITIALIZATION
C++ allows you to skip the size of an
array is the initialization . This is called an
unsize array. C++ calculates is size and
creates it as required.
char s1 [ ] =“first string”;
int val[ ]={2, 3, 4, 5, 6, 7, 8, 9};
float amount [ ]={2341.57, 1900.70, 3986.65 ,
4466.65 , 5151.56};

CALLING FUNCTION WITH
ARRAY
C++ interprets an array name as the
address of its first element. C++ treats the
name of an array as if it were a pointer.
When an array is used as an argument
to a function, only the address of the array
gets passed not a copy of the entire array.

AN INTERESTING THING
ABOUT AN ARRAY
Since name of an array is pointer to its
first element ,the array name +1gives the
address of the next element.+2 gives the
address of the third element. So for an int
array Val[10] ,if you pass val+2 as an
argument to the function the array is passed
But from its third element onward. Ex.
biggest =large(amount+5 , i+2) ;

Structured Data Type Arrays

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