结构体指针

最新推荐文章于 2025-06-19 14:29:40 发布

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#结构 #struct #printf #指针

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本文通过几个实例详细介绍了C语言中结构体的基本定义与使用，包括成员变量的初始化、输出，以及如何通过指针操作结构体变量，并展示了结构体指针的使用方法和链表的基本构建。

#include <stdio.h>
int main()
{
    struct Student
    {
        long int num;
        char name[20];
        char sex;
        char addr[20];

    }a={10101,"Li Lin",'M',"123 Beijing Road"};
    printf("NO.:%ld\nname:%s\nsex:%c\naddress:%s\n",a.num,a.name,a.sex,a.addr);

/home/andrew/文档/Clion/big/cmake-build-debug/big
NO.:10101
name:Li Lin
sex:M
address:123 Beijing Road

Process finished with exit code 0

#include <stdio.h>
#include<string.h>
//#include "fun.h"
//#include "func.h"
int main()
{
    struct Student
    {
        long num;
        char name[20];
        char sex;
        float score;

    };
    struct Student stu_1;
    struct Student *p;
    p=&stu_1;
    stu_1.num=10101;
    strcpy(stu_1.name,"Li Lin");
    stu_1.sex='M';
    stu_1.score=89.5;
    printf("NO.:%d\nname:%s\nsex:%c\nscore:%5.1f\n\n\n",stu_1.num,stu_1.name,stu_1.sex,stu_1.score);
    printf("NO.:%d\nname:%s\nsex:%c\nscore:%5.1f\n\n\n",(*p).num,(*p).name,(*p).sex,(*p).score);
    printf("NO.:%d\nname:%s\nsex:%c\nscore:%5.1f\n\n\n",p->num,p->name,p->sex,p->score);


    return 0;
}



//////////////////////////////////////////////////////////////////
/home/andrew/文档/Clion/big/cmake-build-debug/big
NO.:10101
name:Li Lin
sex:M
score: 89.5


NO.:10101
name:Li Lin
sex:M
score: 89.5


NO.:10101
name:Li Lin
sex:M
score: 89.5


/////////////////////////////////////////////////////

以上是结构体指针，说明为了方便和直观，在C语言中允许把(*p).num用p->num来代替，因此：(*p).num等价于p->num.“->称为指针运算符”

#include <stdio.h>
//#include<string.h>
//#include "fun.h"
//#include "func.h"
struct Student
{
    int num;
    float score;
    struct Student *next;

};

int main()
{
    struct Student a,b,c,*head,*p;
    a.num=10101;a.score=89.5;
    b.num=10103;b.score=90;
    c.num=10107;c.score=85;
    head=&a;
    a.next=&b;
    b.next=&c;
    c.next=NULL;
    p=head;
    //do {

      p= (*((*p).next)).next;   //(与下面等价)
       //  p=p->next->next;
        printf("%ld %5.1f\n",p->num,p->score);
        //p=p->next->next;

   // }while(p!=NULL);
    return 0;

}