c语言中使用指向结构指针的原因

#include <stdio.h>

#define LEN 20

struct names                    //定义结构体names

{

    char first[LEN];

    char last[LEN];

};

struct guy                      //定义结构体guy

{

    struct names handle;

    char favfood[LEN];

    char job[LEN];

    float income;

};

int main(void)

{

    struct guy fellow[2] = {   

        //这是一个结构嵌套，guy结构里嵌套了names结构

        //初始化结构数组fellow，每个元素都是一个结构变量

        {{"Ewen","Villard"},

        "girlled salmon",

        "personality coach",

        68112.00

        },

        {{"Rodney","Swillbelly"},

        "tripe",

        "tabloid editor",

        432400.00

        }

    };

    struct guy * him;       //这是一个指向结构的指针

    printf("address #1:%p #2:%p\n",&fellow[0],&fellow[1]);

    him = &fellow[0];       //告诉编译器该指针指向何处

    printf("pointer #1:%p #2:%p\n",him,him+1);//两个地址

    printf("him->income is $%.2f:(*him).income is $%.2f\n",him->income,(*him).income);//68112.00

    //指向下一个结构,him加1相当于him指向的地址加84。names结构占40个字节，favfood占20字节，handle占20字节，float占4个字节，所以地址会加84

    him++;    

    printf("him->favfood is %s: him->handle.last is %s\n",him->favfood,him->handle.last);

    //因为有了上面的him++，所以指向的是favfood1[1],

    return 0;

}

输出结果为

PS D:\Code\C\结构> cd "d:\Code\C\结构\" ; if ($?) { gcc structDemo02.c -o structDemo02 } ; if ($?) { .\structDemo02 }

address #1:000000000061FD70 #2:000000000061FDC4

pointer #1:000000000061FD70 #2:000000000061FDC4

him->income is $68112.00:(*him).income is $68112.00

him->favfood is tripe: him->handle.last is Swillbelly