c语言指向结构体数组的指针

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

struct dangdang
{
    char email[30];
    char name[30];
    char addr[100];
    int num;
    int bugnum;
    char tel[20];
    char phone[20];
    double RMB;
    
}dbdd[2]={{"1171546435@qq.com","lj","重庆市",34,77,"18778654634","4334564",1000},
{"453454534@qq.com","fd","贵阳",43,65,"543475634","45345",54444}
};

//访问数组
void main3()
{
    int a[5]={1,2,3,4,5};
    int *p;
    for(p=a;p>a+5;p++)//p++根据类型增加 一次增加四个字节
    {
        printf("%d%x",*p,p);
    }
}

void main4()
{
    struct dangdang *p;
    for(p=dbdd;p<dbdd+4;p++)
    {
        //两种方式
        printf("\nname=%s,addr=%s,phone=%s",p->name,p->addr,p->phone);
        printf("\nname=%s,addr=%s,phone=%s",(*p).name,(*p).addr,(*p).phone);
    }

    getchar();
}