指向结构体变量的指针的简单应用

#include <stdio.h>
 void main()
 {
    struct student/*声明结构体*/
    {
        /*结构体成员*/
        long num;
        char name[20];
        char sex;
        float score;

    };
    struct student stu_1;/*定义结构体类型的变量*/
    struct student *p;/*定义结构体类型的指针变量*/
    p=&stu_1;/*指向结构体变量的起始地址*/
    stu_1.num=89101;/*对结构体成员赋值*/
    strcpy(stu_1.name,"Li Lin");
    stu_1.sex='M';
    stu_1.score=89.5;
    printf("NO:%ld\n name:%s\n sex:%c \n score:%f\n",stu_1.num,stu_1.name,stu_1.sex,stu_1.score);
    /* (*p)表示p指向的结构体变量,(*p).num 是p指向的结构体变量中的成员*/
    printf("NO:%ld\n name:%s\n sex:%c\n score:%f\n",(*p).num,(*p).name,(*p).sex,(*p).score);
    system("pause");
 }

 

指向结构体数组的指针

 

#include <stdio.h>

struct student
{
    int num;
    char name[20];
    char sex;
    int age;

};
/*指向结构体类型的数组的初始化*/
 struct student stu[3]={{10101,"Li Lin",'M',18},{10102,"Zhang Fun",'M',19},
     {10104,"Wang Min",'F',20}};
 void main()
 {
     struct student *p;/*指向结构体类型的指针变量*/
     printf("NO  Name  Sex  Age\n");
     for(p=stu;p<stu+3;p++)/*循环地址*/
     {
/*         printf("%5d%-20s %2c %4d\n",p->num,p->name,p->sex,p->age); 等价于*/
   printf("%5d%-20s %2c %4d\n",(*p).num,(*p).name,(*p).sex,(*p).age);
     }
     system("pause");
 }