链表怎么这么难理解
本帖最后由 编程小土豆 于 2019-8-9 15:45 编辑这段代码看了一天,还是有几个地方没搞懂,希望大家帮忙讲一下:
#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
#define LEN sizeof(struct student)
struct student *creat(); //创建链表
void print(struct student *head); //打印链表
struct student
{
int num;
float score;
struct student *next;
};
int n; //全局变量,用来记录存放了多少数据。
void main()
{
struct student *stu;
stu = creat();
print( stu );
printf("\n\n");
system("pause");
}
struct student *creat()
{
struct student *head;
struct student *p1, *p2;
p1 = p2 = (struct student *)malloc(LEN);
printf("Please enter the num :");
scanf("%d", &p1->num);
printf("Please enter the score :");
scanf("%f", &p1->score);
head = NULL;
n = 0;
while( p1->num )
{
n++;
if( 1 == n )
{
head = p1;
}
else
{
p2->next = p1;
}
p2 = p1;
p1 = (struct student *)malloc(LEN);
printf("\nPlease enter the num :");
scanf("%d", &p1->num);
printf("Please enter the score :");
scanf("%f", &p1->score);
}
p2->next = NULL;
return head;
}
void print(struct student *head)
{
struct student *p;
printf("\nThere are %d records!\n\n", n);
p = head;
if( head )
{
do
{
printf("学号为 %d 的成绩是: %f\n", p->num, p->score);
p = p->next;
}while( p );
}
}
视频教程里写的是:“如果输入的p1->num=0,则应链入第二个结点(n=2),将新结点的地址赋给第一个结点的next成员。 接着使p2 = p1,也就是使p2指向刚才建立的结点”
标红的这两条,p1和p2到底哪个是新结点呀,谁是第一个,谁是第二个呢? 本帖最后由 编程小土豆 于 2019-8-9 15:47 编辑
在源代码里有“color”的两句话 两个东西,一个是自己的,一个是下个数据的地址(方便寻找)
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