shell_sort.c

#include <stdio.h>
#include <stdlib.h>

void shell_sort(int *arr, int n) {
    int temp;
    for (int gap = n / 2; gap > 0; gap /= 2) {
        for (int i = gap; i < n; i++) {
            int j = i;
            while (j >= gap && arr[j] < arr[j - gap]) {
                temp = arr[j];
                arr[j] = arr[j - gap];
                arr[j - gap] = temp;
                j -= gap;
            }
        }
    }
}

int main(int argc, char** argv) {
    int arr[] = { 5, 4, 3, 2, 1 };
    int n = sizeof(arr) / sizeof(arr[0]);

    shell_sort(arr, n);

    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }

    return 0;
}