问个c语言链表的问题？？？

Question

不知道我这个链表哪里建立错了，每次编译都通不过。
我觉得原理应该搞懂了，求大神指点一下啊 啊啊啊啊

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
typedef struct link
{
    int a;
    struct link *next;
}ST;
ST *begain;
ST *p;
void creat()
{
    ST *h;
    srand((unsigned)time(NULL));
    h->a=rand()%100+1;
    h->next=begain->next;
    begain->next=h;
}
void Lprint()
{
    int k=0;
    p=begain->next;
    do
    {   
        printf("%6d",p->a);
        k++;
        p=p->next;
    }while(p==NULL);
}
void main()
{
    begain->next=NULL;
    creat();
    Lprint();
}

Answer 1

有两个问题：
1.需要为每个节点都malloc一个空间
2.do()while这里的判断条件应该是p!=NULL

 #include <stdio.h>
#include <time.h>
#include <stdlib.h>
typedef struct link
{
    int a;
    struct link *next;
}ST;
ST *begain;
ST *p;
void creat()
{
    ST *h = (ST *)malloc(sizeof(ST));
    srand((unsigned)time(NULL));
    h->a=rand()%100+1;
    h->next=begain->next;
    begain->next=h;
}
void Lprint()
{
    int k=0;
    p=begain->next;
    do
    {   
        printf("%6d",p->a);
        k++;
        p=p->next;
    }while(p!=NULL);
}
void main()
{
    begain = (ST *)malloc(sizeof(ST));
    begain->next=NULL;
    creat();
    Lprint();
}