C：C的排序算法：归并排序（MergeSort）

#include
typedef struct Array
{
	int key;
}Array;
#define LENGTH 8
void Merge(Array A[],int low,int mid,int high);
void MergeSort(Array A[],int low , int high);
int main(void) {
	int arr[LENGTH] = { 312,214,21,42,3,2325,23,15 };
	int index = 1;
	Array A[LENGTH+1];
	while (index<=LENGTH){
		A[index].key = arr[index - 1];
		printf("排序前：%d\n",A[index].key);
		index++;
	}
	MergeSort(A,1,LENGTH);
	printf("**************************\n");
	index = 1;
	while (index <= LENGTH) {
		printf("排序后：%d\n", A[index].key);
		index++;
	}
	return 0;
}
void Merge(Array A[], int low, int mid, int high) {
	Array *B = (Array *)malloc((LENGTH) * sizeof(Array));
	int i, j, k;
	for (k = low; k <= high;k++) {
		B[k] = A[k];
	}
	for (i = low, j = mid + 1, k = i; i <= mid&&j <= high; k++) {
		if (B[i].key <= B[j].key) {
			A[k] = B[i++];
		}
		else{
			A[k] = B[j++];
		}
	}
	while (i <= mid) {
		A[k++] = B[i++];
	}
	while (j <= high) {
		A[k++] = B[j++];
	}
}
void MergeSort(Array A[], int low, int high) {
	if (low < high) {
		int mid = (low + high) / 2;
		MergeSort(A, low, mid);
		MergeSort(A, mid+1, high);
		Merge(A, low, mid,high);
	}
}