SHELL SORT

#include <stdio.h>

void shellsort(int arr[], int num)

{

    int i, j, k, tmp;

    for (i = num / 2; i > 0; i = i / 2)

    {

        for (j = i; j < num; j++)

        {

            for(k = j - i; k >= 0; k = k - i)

            {

                if (arr[k+i] >= arr[k])

                    break;

                else

                {

                    tmp = arr[k];

                    arr[k] = arr[k+i];

                    arr[k+i] = tmp;

                }

            }

        }

    }

}

int main()

{

    int arr[30];

    int k,  num;

    printf("Enter total no. of elements : ");

    scanf("%d", &num);

    printf("\nEnter %d numbers: ", num);

    for (k =  0 ; k < num; k++)

    {

        scanf("%d", &arr[k]);

    }

    shellsort(arr, num);

    printf("\n Sorted array is: ");

    for (k = 0; k < num; k++)

        printf("%d ", arr[k]);

    return 0;

}