洗牌，随机数组

#include <iostream>
#include <ctime>

void MySwap(int *a, int *b)
{
	*a = *a ^ *b;
	*b = *a ^ *b;
	*a = *a ^ *b;

}
void RandArr(int *arr, int arrLen)
{
	if (NULL == arr || arrLen <= 0)
	{
		return ;
	}

	int pos;
	srand(time(NULL));
	for (pos = arrLen - 1; pos > 0; --pos)
	{
		int randomPos = rand()%pos;
		MySwap(&arr[randomPos],&arr[pos]);
	}
}
#if 1
int main()
{
	int arr[] = {1,2,3,4,5,6,7};
	for (int i = 0 ; i < 10; ++i)
	{
		RandArr(arr,sizeof(arr)/sizeof(arr[0]));
	}

}
#endif