指针符号的优先级

#include <stdio.h>
#include <stdlib.h>

struct i2c_dev
{
    int fd;
    int addr;
};

static struct i2c_dev  i2c[3];
static struct i2c_dev* pi2c;

int main()
{

    pi2c = &i2c[1];
    i2c[1].fd = 0x02;
    printf("i2c_dev  fd is %d\n",++pi2c->fd);  // 3 

    printf("i2c_dev  fd is %d\n",pi2c++->fd);  // 3 


    return 0;
}

 

#include <stdio.h>
#include <stdlib.h>

struct stu
{
    int x;
    int *y;
};

struct stu*p;

int dt[4] = {10,20,30,40};
struct stu a[4] = {50,&dt[0],60,&dt[1],70,&dt[2],80,&dt[3]};

int main()
{

    p = a;
    printf("%d,",++p->x);     // 51 
    printf("%d,",(++p)->x);   // 60 
    printf("%d\n",++(*p->y)); // 21    // -> 这个优先级 比较高


    return 0;
}