用c语言实现插入排序，希尔排序，选择排序，快速排序。

以下是用C语言实现插入排序，希尔排序，选择排序和快速排序的示例代码：

1. 插入排序

void insertion_sort(int arr[], int n) {
    int i, j, key;
    for (i = 1; i < n; i++) {
        key = arr[i];
        j = i - 1;
        while (j >= 0 && arr[j] > key) {
            arr[j+1] = arr[j];
            j--;
        }
        arr[j+1] = key;
    }
}

2. 希尔排序

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

3. 选择排序

void selection_sort(int arr[], int n) {
    int i, j, min_idx;
    for (i = 0; i < n-1; i++) {
        min_idx = i;
        for (j = i+1; j < n; j++) {
            if (arr[j] < arr[min_idx]) {
                min_idx = j;
            }
        }
        swap(&arr[min_idx], &arr[i]);
    }
}

4. 快速排序

void quick_sort(int arr[], int low, int high) {
    if (low < high) {
        int pi = partition(arr, low, high);
        quick_sort(arr, low, pi-1);
        quick_sort(arr, pi+1, high);
    }
}

int partition(int arr[], int low, int high) {
    int pivot = arr[high];
    int i = low - 1;
    int j;
    for (j = low; j <= high-1; j++) {
        if (arr[j] < pivot) {
            i++;
            swap(&arr[i], &arr[j]);
        }
    }
    swap(&arr[i+1], &arr[high]);
    return i+1;
}

void swap(int *a, int *b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}