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Elementary sorting and Selection sort for data structure in 'C'

Elementary sorting:

            As we have seen in the case of binary search that it is necessary to arrange the elements of the array in a particular order either in ascending or in descending order. So if the elements of the array are arranged in either ascending or descending order then such array is called as sorted array. The operation necessary to apply on the array to arrange the elements of the same in order is called as sorting. If the array elements are not stored order then we apply sorting operation to sort the array elements. the elementary sorting techniques that are used are Selection sort, Insertion sort, and bubble sort. Basically the sorting operation is applied to sort the elements in ascending order. Let us study the techniques to sort the elements of one-dimensional array in ascending order.

  Selection sort:

           In this technique of sorting, the fact of selecting the minimum element from n (size of the array) number of elements is used. The selected minimum element is interchanged with the first element of the array. Then leaving the first element, the minimum element is again picked from the remaining n-1 elements and interchanged with the second element. The same process of selecting minimum element and interchanging it from the respective element is repeated to obtain the sorted array. In total n-1 passes are applied to obtain the sorted array. As we select the minimum element in every pass this technique of sorting the elements is called as Selection sort. 


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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.
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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 …