Question

谁能帮我详细解释下这段程序的意思，c语言的，在线等

从p=(pointer *)malloc(sizeof(struct pointer));开始
#include<stdio.h>
#include<stdlib.h>

typedef struct pointer{
char dat;
struct pointer *link;
} pointer;

void readdata(pointer *head){ //读集合
pointer *p;
char tmp;
printf("input data ('0' for end):");
scanf("%c",&tmp);
while(tmp!='0')
{
if((tmp<'a')||(tmp>'z'))
{
printf("\n");
return;
}
p=(pointer *)malloc(sizeof(struct pointer));
p->dat=tmp;
p->link=head->link;
head->link=p;
scanf("%c",&tmp);
}
}

Answer 1

p=(pointer *)malloc(sizeof(struct pointer));//为指针p申请内存空间
p->dat=tmp;//这个不用解释了吧
p->link=head->link;//下面两行把p插入到链表的头部
head->link=p;//