C语言结构体指针引用详解

# include <stdio.h>
# include <string.h>
struct AGE
{
    int year;
    int month;
    int day;
};
struct STUDENT
{
    char name[20];  //姓名
    int num;  //学号
    struct AGE birthday;  //生日
    float score;  //分数
};
int main(void)
{
    struct STUDENT student1; /*用struct STUDENT结构体类型定义结构体变量student1*/
    struct STUDENT *p = NULL;  /*定义一个指向struct STUDENT结构体类型的指针变量p*/
    p = &student1;  /*p指向结构体变量student1的首地址, 即第一个成员的地址*/
    strcpy((*p).name, "小明");  //(*p).name等价于student1.name
    (*p).birthday.year = 1989;
    (*p).birthday.month = 3;
    (*p).birthday.day = 29;
    (*p).num = 1207041;
    (*p).score = 100;
    printf("name : %s\n", (*p).name);  //(*p).name不能写成p
    printf("birthday : %d-%d-%d\n", (*p).birthday.year, (*p).birthday.month, (*p).birthday.day);
    printf("num : %d\n", (*p).num);
    printf("score : %.1f\n", (*p).score);
    return 0;
}

# include <stdio.h>
# include <string.h>
struct AGE
{
    int year;
    int month;
    int day;
};
struct STUDENT
{
    char name[20];  //姓名
    int num;  //学号
    struct AGE birthday;  /*用struct AGE结构体类型定义结构体变量birthday, 生日*/
    float score;  //分数
};
int main(void)
{
    struct STUDENT student1; /*用struct STUDENT结构体类型定义结构体变量student1*/
    struct STUDENT *p = NULL;  /*定义struct STUDENT结构体类型的指针变量p*/
    p = &student1;  /*p指向结构体变量student1的首地址, 即第一项的地址*/
    strcpy(p->name, "小明");
    p->birthday.year = 1989;
    p->birthday.month = 3;
    p->birthday.day = 29;
    p->num = 1207041;
    p->score = 100;
    printf("name : %s\n", p->name);  //p->name不能写成p
    printf("birthday : %d-%d-%d\n", p->birthday.year, p->birthday.month, p->birthday.day);
    printf("num : %d\n", p->num);
    printf("score : %.1f\n", p->score);
    return 0;
}

# include <stdio.h>
struct STU
{
    char name[20];
    int age;
    char sex;
    char num[20];
};
int main(void)
{
    struct STU stu[5] = {{"小红", 22, 'F', "Z1207031"}, {"小明", 21, 'M', "Z1207035"}, {"小七", 23, 'F', "Z1207022"}};
    struct STU *p = stu;
    return 0;
}

# include <stdio.h>
struct STU
{
    char name[20];
    int age;
    char sex;
    char num[20];
};
int main(void)
{
    struct STU stu[3] = {{"小红", 22, 'F', "Z1207031"}, {"小明", 21, 'M', "Z1207035"}, {"小七", 23, 'F', "Z1207022"}};
    struct STU *p = stu;
    for (; p<stu+3; ++p)
    {
        printf("name:%s; age:%d; sex:%c; num:%s\n", p->name, p->age, p->sex, p->num);
    }
    return 0;
}

# include <stdio.h>
struct STU
{
    char name[20];
    int age;
    char sex;
    char num[20];
};
int main(void)
{
    struct STU stu[3] = {{"小红", 22, 'F', "Z1207031"}, {"小明", 21, 'M', "Z1207035"}, {"小七", 23, 'F', "Z1207022"}};
    struct STU *p = stu;
    int i = 0;
    for (; i<3; ++i)
    {
        printf("name:%s; age:%d; sex:%c; num:%s\n", p[i].name, p[i].age, p[i].sex, p[i].num);
    }
    return 0;
}