Introduction to Array : C Programming

Introduction to Array :

Overview : So far we are using the single variable name for storing one data item. But suppose we have to store the roll numbers of the 100 students the we have to declare 100 variables named as roll1,roll2,roll3,…….roll100 which is very difficult job.So the concept of array is introduced in C which gives the capability to store the 100 roll numbers in the contiguous memory which has 100 blocks , can be accessed by single vaiable name.

• Array is the Collection of Elements
• Collection of the Elements of the same data type.
• All Elements are stored in the Contiguous memory

The above array is declared as int a[5];

a[0] = 4;
a[1] = 5;
a[2] = 33;
a[3] = 13;
a[4] = 1;

4,5,33,13,1 are actual data items … ( in our case Roll numbers )
0,1,2,3,4 are index variables ..( similar to ‘i’ in for loop / Subscript variable )

Definition of Array :

What is index or Subscript variable ?

• Individual data items can be accessed by the name of the array and an integer enclosed in square bracket called subscript variable / index