Array

2. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
Ltd

3. ARRAYS
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4. Variables
Variables are memory locations that are given names and
can be assigned values
For eg: int a=10;
Char b=‘string’;
A single value can be represented at a time by a single
identifier
If we want to represent multiple values
through a single identifier then…?

5. Arrays
Array by definition is a variable that hold multiple
elements which has the same data type
 Group of consecutive memory locations
The various locations where the values can be
stored are called indexes
The various values stored on the indexes are
called the elements or the contents
Arrays are generally shown either in the form of rows or
in the form of columns
Syntax: Data type array name[size];
Eg: int a[10]; Indicates array ‘a’ of ‘int’type
of size ‘10’.

6. Array categories:
Array
One-dimensional array
Syntax: Datatype arrayname[size];
Eg: Int a[10];
Multi-Dimensional array
Syntax:Datatype arrayname[size of row]
[size of column]
Eg:int a[3][3];

7. Declaring Arrays…
• When declaring arrays, specify
– Name
– Type of array
– Number of elements
arrayType arrayName[ numberOfElements ];
– Examples:
int c[ 10 ];
float myArray[ 3284 ];
• Declaring multiple arrays of same type
– Format similar to regular variables
– Example:
int b[ 100 ], x[ 27 ];
One-dimensional array:

8. Character arrays…
String “first” is really a static array of characters
 Character arrays can be initialized using string literals
char string1[] = "first";
Null character '0' terminates strings
string1 actually has 6 elements
It is equivalent to
char string1[] = { 'f', 'i', 'r', 's', 't', '0'
};
Can access individual characters
string1[ 3 ] is character „s‟

9. Multi-Dimensional Arrays…
• Multi-Dimensional arrays
– Tables with rows and columns
– Like matrices: specify row, then column
Row 0
Row 1
Row 2
Column 0 Column 1 Column 2 Column 3
a[ 0 ][ 0 ]
a[ 1 ][ 0 ]
a[ 2 ][ 0 ]
a[ 0 ][ 1 ]
a[ 1 ][ 1 ]
a[ 2 ][ 1 ]
a[ 0 ][ 2 ]
a[ 1 ][ 2 ]
a[ 2 ][ 2 ]
a[ 0 ][ 3 ]
a[ 1 ][ 3 ]
a[ 2 ][ 3 ]
Row subscript
Array name
Column subscript

10. • Initialization
– int b[ 2 ][ 2 ] = { { 1, 2 }, { 3, 4 } };
– Initializers grouped by row in braces
– If not enough, unspecified elements set to zero
int b[ 2 ][ 2 ] = { { 1 }, { 3, 4 } };
• Referencing elements
– Specify row, then column
printf( "%d", b[ 0 ][ 1 ] );
Multi_Dimensional Array..
1 2
3 4
1 0
3 4

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