script.c

// Shell Sort in C programming

#include <stdio.h>

// Shell sort
void shellSort(int array[], int n) {
  // Rearrange elements at each n/2, n/4, n/8, ... intervals
  for (int interval = n / 2; interval > 0; interval /= 2) {
    for (int i = interval; i < n; i += 1) {
      int temp = array[i];
      int j;
      for (j = i; j >= interval && array[j - interval] > temp; j -= interval) {
        array[j] = array[j - interval];
      }
      array[j] = temp;
    }
  }
}

// Print an array
void printArray(int array[], int size) {
  for (int i = 0; i < size; ++i) {
    printf("%d  ", array[i]);
  }
  printf("\n");
}

// Driver code
int main() {
  int data[] = {11, 14, 18, 21, 89, 34, 567, 234, 98};
  int size = sizeof(data) / sizeof(data[0]);
  shellSort(data, size);
  printf("Sorted array: \n");
  printArray(data, size);
}