变量的间接赋值与间接引用

struct Student
{
char a;
int b;
char c;
int d;
};
struct Student p = { 'a', 1, 'b', 2 };
printf("p.d:%d\n",p.d);

p.d = 1000;

printf("%d\n", *(int *)((char *)&p + 12));//1000

(char *)&p 设置偏移量为1
(char *)&p + 12 找到d的首地址
(int *)((char *)&p + 12)取以d地址为首的四个字节
*(int *)((char *)&p + 12)间接引用d

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