为什么下面insert函数中的gets函数无效啊， 运行的时候像没有那个语句一样，直接进行下个语句了。
我是菜鸟啊，学校的作业，谢谢大家了

#include"stdio.h"
#include"string.h"
typedef struct node
{
        char name[20];
        int num;
        int math,eng,phy;
        struct node *next;
}linklist,*list;

list insert(list L)
{
  int x;
  list p,r,b;   r=L;
  printf("please input the Number:");
  scanf("%d",&x);
 while(x!=-1){
  p=(list)malloc(sizeof(linklist));
  printf("please input the name:");
  gets(p->name);
  printf("please input the math:");
  scanf("%d",&p->math);
  printf("please input the eng:");
  scanf("%d",&p->eng);
  printf("please input the phy:");
  scanf("%d",&p->phy);
  p->num=x;  r->next=p; r=r->next; r->next=NULL;
  printf("please input the Number:");
  scanf("%d",&x);
  }
  return(L);
}

list creatlist()
{ list L;
  L=(list)malloc(sizeof(linklist));
  L->num=-1;
  L->next=NULL;
  L=insert(L);
  return(L);
}

list output(list L)
{
  list r;  r=L->next;
  if(r==NULL)  return L;
  while(r!=NULL)
  {  printf("the num is:%d\n",r->num);
     printf("name:%s\n",r->name);
     printf("math:%d\n",r->math);
     printf("eng:%d\n",r->eng);
     printf("phy:%d\n",r->phy);

     printf("----------------------\n");
     r=r->next;                          }
     return L;
}


void main()
{    list L;
     L=creatlist();
     printf("done\n");
     output(L);
     getch();
}

其实我刚问完就百度到了   好吧这次是我懒惰了
谢谢大家哈