前言

结构指针与结构数组，他们一起使用时会更加方便。就像指针和数组。

  1. 结构指针的声明
    struct guy * him

  2. 指向 him = &fellow[0]
    但是有一点需要注意：单纯的结构数组名没有作用
    数组的变量名是数组的首元素地址。结构数组的变量名不是结构数组的首结构地址。
    所以但要将首结构的地址赋给指针时，要加上&和[0]

  3. 用指针访问
    him->handle.first//意义：用him指针指向成员的成员
    等价于
    (*him).handle.first//意义：取值为结构struct guy fellow[0]这个结构
    这里必须要用()，因为.比*的优先级高。

示例

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/* friends.c -- uses pointer to a structure */
#include <stdio.h>
#define LEN 20

struct names {
    char first[LEN];
    char last[LEN];
};

struct guy {
    struct names handle;//结构嵌套
    char favfood[LEN];
    char job[LEN];
    float income;
};

int main(void)
{
    struct guy fellow[2] = {//结构数组
        {{ "Ewen", "Villard"},
            "grilled salmon",
            "personality coach",
            68112.00
        },
        {{"Rodney", "Swillbelly"},
            "tripe",
            "tabloid editor",
            432400.00
        }
    };
    struct guy * him;    /* here is a pointer to a structure */
    
    printf("address #1: %p #2: %p\n", &fellow[0], &fellow[1]);
    him = &fellow[0];    /* tell the pointer where to point  */
    printf("pointer #1: %p #2: %p\n", him, him + 1);
    printf("him->income is $%.2f: (*him).income is $%.2f\n",
           him->income, (*him).income);
    him++;               /* point to the next structure      */
    printf("him->favfood is %s:  him->handle.last is %s\n",
           him->favfood, him->handle.last);
    
    return 0;
}