Arrays in c language:

Arrays in c language:

Definition

An array is an aggregate data type that lets you access multiple variables through a single name by use of an index.

An ordinary variable cannot store more than one value at a time. Consider a situation of storing the marks of students of a class consists of sixty students. we need 60 variables . so the program will become very complex.

The solution to the above situation is to declare a variable that can store more than one value. In this situation we need 60 blocks of memory. A variable that can store more than one value is called an array.  In an array all the data should be of same data type . All the data are stored in contiguous memory location.

Array declaration:

To store integer value of 5 data example is

int a[5];.

a is actually an  user defined variable name . all the rules of naming an ordinary variable also apply to an array variable name.

Assigning data to an array example:

int a[5]={5,6,4,3,7};

the data are actually stored as

a[0]=5

a[1]=6

a[2]=4

a[3]=3

a[4]=7

note array index starts with zero and upper bound index is less than one of array length. In the above example, length of array is 5.

Getting input for an array example

for(i=0;i<5;i++)

{

scanf(“%d”,&a[i]);

}

Printing output for an array example is

for(i=0;i<5;i++)

{

printf(“%d\t ”, a[i]);

}

 sample program:

#include<stdio.h>

#include<conio.h>

void main()

{

int a[5],i;

clrscr();

/* getting input */

printf(“enter 5 values of a”);

for(i=0;i<5;i++)

{

scanf(“%d”,&a[i]);

}

/* printing output */

printf(“The datas of array a are”);

 for(i=0;i<5;i++)

{

printf(“%d\t ”, a[i]);

}

getch();

}