Wu Yuxiong - natural born C language development: sorting algorithm

#include <stdio.h>
void bubble_sort(int arr[], int len) {
    int i, j, temp;
    for (i = 0; i < len - 1; i++)
        for (j = 0; j < len - 1 - i; j++)
            if (arr[j] > arr[j + 1]) {
                temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
}
int main() {
    int arr[] = { 22, 34, 3, 32, 82, 55, 89, 50, 37, 5, 64, 35, 9, 70 };
    int len = (int) sizeof(arr) / sizeof(*arr);
    bubble_sort(arr, len);
    int i;
    for (i = 0; i < len; i++)
        printf("%d ", arr[i]);
    return 0;
}

void the swap ( int * A, int * B) // swap two variables 
{
     int TEMP * = A;
     * = A * B;
     * B = TEMP; 
} 
void selection_sort ( int ARR [], int len) 
{ 
    int I , J; 
 
    for (I = 0 ; I <len - . 1 ; I ++ ) 
    { 
        int min = I;
         for (J = I + . 1 ; J <len; J ++)      // visited element unordered 
            IF (ARR [J] <arr [min])    // find the current minimum value 
                min = J;     // record the minimum value of 
           the swap (& ARR [min], & ARR [I]);     // do the exchange 
    } 
}

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

void shell_sort(int arr[], int len) {
    int gap, i, j;
    int temp;
    for (gap = len >> 1; gap > 0; gap = gap >> 1)
        for (i = gap; i < len; i++) {
            temp = arr[i];
            for (j = i - gap; j >= 0 && arr[j] > temp; j -= gap)
                arr[j + gap] = arr[j];
            arr[j + gap] = temp;
        }
}

int min(int x, int y) {
    return x < y ? x : y;
}
void merge_sort(int arr[], int len) {
    int* a = arr;
    int* b = (int*) malloc(len * sizeof(int));
    int seg, start;
    for (seg = 1; seg < len; seg += seg) {
        for (start = 0; start < len; start += seg + seg) {
            int low = start, mid = min(start + seg, len), high = min(start + seg + seg, len);
            int k = low;
            int start1 = low, end1 = mid;
            int start2 = mid, end2 = high;
            while (start1 < end1 && start2 < end2)
                b[k++] = a[start1] < a[start2] ? a[start1++] : a[start2++];
            while (start1 < end1)
                b[k++] = a[start1++];
            while (start2 < end2)
                b[k++] = a[start2++];
        }
        int* temp = a;
        a = b;
        b = temp;
    }
    if (a != arr) {
        int i;
        for (i = 0; i < len; i++)
            b[i] = a[i];
        b = a;
    }
    free(b);
}

void merge_sort_recursive(int arr[], int reg[], int start, int end) {
    if (start >= end)
        return;
    int len = end - start, mid = (len >> 1) + start;
    int start1 = start, end1 = mid;
    int start2 = mid + 1, end2 = end;
    merge_sort_recursive(arr, reg, start1, end1);
    merge_sort_recursive(arr, reg, start2, end2);
    int k = start;
    while (start1 <= end1 && start2 <= end2)
        reg[k++] = arr[start1] < arr[start2] ? arr[start1++] : arr[start2++];
    while (start1 <= end1)
        reg[k++] = arr[start1++];
    while (start2 <= end2)
        reg[k++] = arr[start2++];
    for (k = start; k <= end; k++)
        arr[k] = reg[k];
}
void merge_sort(int arr[], const int len) {
    int reg[len];
    merge_sort_recursive(arr, reg, 0, len - 1);
}

typedef struct _Range {
    int start, end;
} Range;
Range new_Range(int s, int e) {
    Range r;
    r.start = s;
    r.end = e;
    return r;
}
void swap(int *x, int *y) {
    int t = *x;
    *x = *y;
    *y = t;
}
void quick_sort(int arr[], const int len) {
    if (len <= 0 )
         return ; // initiator error segment (Segment Fault) is equal to len avoiding negative
     // R & lt [] a list of simulation, p is the number, r [p ++] to push, r [- p] and to obtain elements pop 
    Range R & lt [len];
     int P = 0 ; 
    R & lt [P ++] = new_Range ( 0 , len - . 1 );
     the while (P) { 
        the Range Range = R & lt [- P];
         IF (range.start> = Range. End)
             Continue ;
         int mID = ARR [(range.start range.end +) / 2 ]; // selected intermediate point as a reference point 
        int left = range.start, right =range.end;
         do 
        { 
            the while (ARR [left] <MID) left ++;    // left detection reference point meets the requirements 
            the while (ARR [right]> MID) --right; // right detection reference point meet the requirements 
 
            IF (left <= right) 
            { 
                the swap ( & ARR [left], & ARR [right]); 
                left ++; right -;                // move the pointer to continue 
            } 
        } the while (left <= right); 
 
        IF (Range. Start <right) R & lt [P ++] = new_Range (range.start, right);
         IF (range.end> left) R & lt [P ++] = new_Range(left, range.end);
    }
}

void swap(int *x, int *y) {
    int t = *x;
    *x = *y;
    *y = t;
}
void quick_sort_recursive(int arr[], int start, int end) {
    if (start >= end)
        return;
    int mid = arr[end];
    int left = start, right = end - 1;
    while (left < right) {
        while (arr[left] < mid && left < right)
            left++;
        while (arr[right] >= mid && left < right)
            right--;
        swap(&arr[left], &arr[right]);
    }
    if (arr[left] >= arr[end])
        swap(&arr[left], &arr[end]);
    else
        left++;
    if (left)
        quick_sort_recursive(arr, start, left - 1);
    quick_sort_recursive(arr, left + 1, end);
}
void quick_sort(int arr[], int len) {
    quick_sort_recursive(arr, 0, len - 1);
}