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ARRAY---

DEF:-


  • Array is a linear collection of similar elements
  • Array is also known as subscript value
  • Array is a group of value
  • when there is a lot of data then array is required
  • Array are the derived data types in c language which can store the primitive data types of type int, float, char etc.
  • in array each element have index, through index each element can be accessed randomly.

Advantage of Array:--
  1. Code Optimization:- less code to access the data
  2. Ease of traversing:- by using loop we can traverse the element of array
  3. Ease of sorting:- to sort the array only few codes are written
  4. randomly access:- any element access randomly
Disadvantage of Array:-
  1. Fixed size:- the size of array is defined when we declared an array, which cannot be change.Array in c are not dynamically like linked list etc.
Declaration of Array:-
  • An Array can be declared such as we declare the function , only difference is ,In function argument is passed but in array size is declared
  • [] brackets are used to define the size of array
  • index no. is start from 0
Syntax:--data_types  array_name[size of array]; // 1-D Array

example:--   int a[7];  //array a of type int is declared having size 7 and also have a value
                   a[0]=11;  // 11 is insert at index no. 0

Note:-  an Array is initialize when it is declared 

  • int a[7]={11,22,33,44,55,66,77};
  • int a[]={11,22,33,44,55,66,77}; // without giving size
1-Dimensional Array(Default Array) :-
Example:-

2-Dimensional Array:- 2 d array having rows and column, i.e[][] two square brackets having used.
first one for rows and second one for column in each rows
Syntax:--  int arr[4][3]={{1,2,3},{4,5,6},{7,8,9},{10,11,12}};
Explanation:--  here from diagram clearly seen how 2 d array takes memory , 
to access any element bu using index no. is a[1][2]=5;
Example:-

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