我正在学习C语言,但我无法理解以下代码:
struct dns_header
{
unsigned char ra : 1;
unsigned char z : 1;
unsigned char ad : 1;
unsigned char cd : 1;
unsigned char rcode : 4;
unsigned short q_count : 16;
};
int main(void)
{
struct dns_header *ptr;
unsigned char buffer[256];
ptr = (struct dns_header *) &buffer;
ptr->ra = 0;
ptr->z = 0;
ptr->ad = 0;
ptr->cd = 0;
ptr->rcode = 0;
ptr->q_count = htons(1);
}
我不理解的是
ptr = (struct dns_header *) &buffer;
这一行代码。有人能够详细解释一下吗?