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Linear Search applied to Linked List for Data Structure in 'C'

 Linear Search applied to Linked List

        In Linked List linear searching is nothing but finding a node with the given information for the presence. If it is present search is successful otherwise unsuccessful. Linked List supports only linear search. The main reason behind this is the inability of reaching any of the nodes directly except the first node. Only the address of the first node is always available in an external pointer. With the help of the first node only it is possible to reach the second node. Without the address of previous node one can not reach the next node. The next node’s address is always stored in previous node. Although the order of the information may in either ascending or descending but accessibility of the elements is not direct, so application of linear is only possible in case of linked list. Searching (of course linear) almost resembles traversing except that if search is successful traversing is terminated otherwise the linked list is traversed till the end.
        So, in order to do linear searching, get the information to be searching and set PTR with ROOT. Compare Information with INFO of PTR, if it is equal ‘search is successful’ and terminate traversing otherwise update PTR with LINK of PTR and repeat the process. Continue the operation till the end. The end is recognized by a NULL assigned to PTR.


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Difference between Linear search and Binary Search in c language

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Binary Search Linear Search Works only on sorted items. such as  1,2,3,4,5,6  etc
Works on sorted as well as unsorted items. 12,4,5,3,2,1 etc Very efficient if the items are sorted Very efficient if the items are less and present in the beginning of the list. such as Suppose your list items are : 12,3,4,5,1 and you want to search 12 number then you get beginning in the list. Works well with arrays and not on linked lists. Works with arrays and linked lists.
Number of comparisons are less More number of comparisons are required if the items are present in the later part of the array or its elements are more.

Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:

      Suppose next node is allocated at an address 506, so the list becomes,

  Suppose next node is allocated with an address with an address 10,s the list become,

The other way to represent the linked list is as shown below:

 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …