swap()函数 万能版 (强制类型转换)

void Swap(void *a,void *b,size_t size)
{
    unsigned char *p1=(unsigned char *)a;          //强制类型转换
    unsigned char *p2=(unsigned char *)b;
    unsigned char temp;                         //字节型的嫁衣
    while(size--)
    {
        temp=*p1;
        *p1=*p2;
        *p2=temp;
        p1++;
        p2++;
    }
}