C Program for Sorting an Array using Insertion Sort

By | 14.09.2017

Sorting an Array using Insertion Sort


Write a C Program for Sorting an Array using Insertion Sort.  Here’s a simple C Program for Sorting an Array using Insertion Sort in C Programming Language.


Insertion Sort


Insertion sort is a simple sorting algorithm that works the way we sort playing cards in our hands.

 

Algorithm
// Sort an arr[] of size n
insertionSort(arr, n)
Loop from i = 1 to n-1.
……a) Pick element arr[i] and insert it into sorted sequence arr[0…i-1]

Time Complexity: O(n*n)

Auxiliary Space: O(1)

Boundary Cases: Insertion sort takes maximum time to sort if elements are sorted in reverse order. And it takes minimum time (Order of n) when elements are already sorted.


Also Read : : C Program for Sorting an Array using Bubble Sort

Below is the source code for C Program for Sorting an Array using Insertion Sort which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/* C Program for Sorting an Array using Insertion Sort */

#include<stdio.h>
#define MAX 100

int main()
{
        int arr[MAX],i,j,k,n;

        printf("\nEnter the number of elements : ");
        scanf("%d",&n);

        for(i=0; i<n; i++)
        {
                printf("\nEnter element %d : ",i+1);
                scanf("%d", &arr[i]);
        }

        /*Insertion sort*/
        for(i=1; i<n; i++)
        {
                k=arr[i]; /*k is to be inserted at proper place*/

                for(j=i-1; j>=0 && k<arr[j]; j--)
                        arr[j+1]=arr[j];
                arr[j+1]=k;
        }

        printf("\nSorted list is :\n");
        for(i=0; i<n; i++)
                printf("  %d  ", arr[i]);
        printf("\n");
        return 0;
}/*End of main()*/

OUTPUT : :


/* C Program for Sorting an Array using Insertion Sort */

Enter the number of elements : 7

Enter element 1 : 3

Enter element 2 : 1

Enter element 3 : 5

Enter element 4 : 7

Enter element 5 : 3

Enter element 6 : 0

Enter element 7 : 0

Sorted list is :
  0    0    1    3    3    5    7

Process returned 0

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