各位高人帮个尽快，我找了很久都不知道问题出在那里？？？ 我不怎么懂.....
  

#include<stdio.h>
#define NULL 0
struct stu
{ int num;
  int age;
  struct stu *next;
};
struct stu *creat(int n)
{ struct stu *head,*pf,*pd;
  int i;
  for(i=0;i<n;i++)
  { pd=(struct stu*)malloc(sizeof(struct stu));
    printf("input number and age:\n");
    scanf("%d%d",&pd->num,&pd->age);
    if(i==0){
    head=pd;
    pf=head;}
    else
    pf->next=pd;
    pd->next=NULL;
    pf=pd;
  }
  head->data=n;
  return head;
}
void main()
{ struct stu *student;
  int i,count=6;
  student=creat(count);
  printf("num:\t   age:\t\n");
  for(i=0;i<6;i++){
    printf("%d  \t\t%d\n",student->num,student->age);
  }
}

#include <stdio.h>
#include <stdlib.h>      /* malloc函数需要包含头文件 */

#define NULL 0
struct stu
{ int num;
  int age;
  struct stu *next;
};
struct stu *creat(int n)
{ struct stu *head,*pf,*pd;
  int i;
  for(i=0;i<n;i++)
  { pd=(struct stu*)malloc(sizeof(struct stu));
    printf("input number and age:");
    scanf("%d%d",&pd->num,&pd->age);

    if(i==0){
    head=pd;
    pf=head;}
    else           /* else后面不止一条语句，必须带大括号 */
    {
    pf->next=pd;
    pd->next=NULL;
    pf=pd;
    }
  }
#if 0
  head->data=n;    /* 你的结构体里并没有data这个元素' */
#endif
  return head;
}
void main()
{ struct stu *student;
  int i,count=2;
  student=creat(count);
  printf("num:\t   age:\t\n");
  for(i=0;i<2;i++){
    printf("%d  \t\t%d\n",student->num,student->age);
    student = student->next;      /* 移到下一个节点 */
  }
}

修改了一点，顺便说下你的排版有点乱，基本功能实现了，我把count修改为2做了验证，打印如下：
input number and age:12
12
input number and age:23
23
num:       age:
12              12
23              23
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