Single Dimensional Array

 Single/One Dimensional Array

An  array in which all the elements  are stored in a unidirectional order and using one subscript to access the elements are called as one Dimensional array.

Syntax

<Data type>  <array variable>[SIZE]        

Ex: int a[5];                                                    

Memory Diagram

In the above Example the array a is Declared as Integer Array  and it can store 5 integer values each of which occupies 2 Bytes .Since total Array occupies (2*5)10 Bytes of Memory as shown below

a --------> Array name

a[0]    a[1]     a[2]    a[3]   a[4]  --------> Array index

                                           

NOTE

1.Subscript is a non negative integer enclosed in [ ] placed immediately after 
 the array name without  any space.

2.In Arrays by default array Index starts with 0.

3.Total array size(in bytes)= Length of array * size of data type

Array Initialization

An array variable can be initialized with a element as given below.

Syntax

Data type  arrayname={value1,value2, value3,valu4……………..value n}

Example: 

 int a[5]={1,2,3,4,5};

In this example first value stored in First Block, second value stored in second block and so on ….. as shown below.

a[0]=1 ; a[1]=2 ; a[2]=3  ;a[3]=4;  a[4]=5.

a 

1

2

3

4

5

                

 a[0]      a[1]      a[2]     a[3]        a[4]

Example

\* sample array*\  #include<stdio.h> #include<conio.h> Void main() {         int a[4]={1,2,3,4};         clrscr();         printf(“\n a[0]=%d”,a[0]);         Printf(“\n a[1]=%d”,a[1]);         Printf(“\n a[2]=%d”,a[2]);         Printf(“\n a[3]=%d”,a[3]);         Printf(“\n a[4]=%d”,a[4]);   }   Explanation: in the above  program , array a[4] is declared in the memory with 5 elements and the elements are finalized with values {1,2,3,4,.to access these elements and print on screen we use printf () function. First printf() prints a [0] value i.e 1, a [1] is 2 and so on…..that is shown below. OUTPUT 1 2 3 4