int DeleteNote(int num)
{
    STU *pc/*當(dāng)前指針*/,*pb;
    pb=head;
    pc=head->next;
    while(pc->num!=num)
    {
        pb=pc;
        pc=pc->next;

    }
    if(pc->num==num)//找到，即刪除pc所指向的節(jié)點(diǎn)
    {
        pb->next=pc->next;
        free(pc);
    }else
    {
        printf（"不存在！\n"）
    }
}

#include<stdio.h>
#include<stdlib.h>
 typedef struct student S;
  S *head;
  S *p;
struct student
{
 char num;
 char sex;
 char name[100];
 struct student *next;
};
int Add()
{
 S *New;
 New=(S *)malloc(sizeof(S));
 printf("輸入個(gè)樣式:學(xué)號(hào) 性別 姓名\n");
 scanf("%d",&New->num);
 getchar();
 scanf("%c",&New->sex);
 getchar();
 scanf("%s",New->name);
 getchar();  
 New->next=NULL;
 p->next=New;
 p=p->next;
 return -1;
}
int print()
{
 printf("全部信息如下:\n");
 p=head->next;//從head的下一個(gè)開始打印
 while(p!=NULL)
 {
  printf("%d  %c  %s\n",p->num,p->sex,p->name);
  p=p->next;
 }
 return 0;
}
int Find(int num)
{
 S *s;
 s=head->next;
 while(s!=NULL)
 {
  if (s->num==num)
  {
   printf("%d %c %s\n",s->num,s->sex,s->name);
   return 0;
  }
  s=s->next;
 }
 printf("No Have\n");
 return -1 ;
}

int DeleteNote(int num)
{
    S *pc/*當(dāng)前指針*/,*pb/*上一個(gè)指針*/;
    pb=head;
    pc=head->next;
    while(pc->num!=num)
    {
        pb=pc;
        pc=pc->next;

    }
    if(pc->num==num)//找到，即刪除pc所指向的節(jié)點(diǎn)
    {
        pb->next=pc->next;
        free(pc);
    }else
    {
        printf("不存在！\n");
    }
    return 0;
    
}
int renew(int num_1)
{
 S *e;
 e=head->next;
 while(p!=NULL)
 {
  if(e->num==num_1)
  {
   //printf("%d  %c  %s\n",p->num,p->sex,p->name);
   printf("請(qǐng)輸入%d學(xué)生的新信息：\n",e->num);
   scanf("%d",&e->num);
   getchar();
   scanf("%c",&e->sex);
   getchar();
   scanf("%s",e->name);
   getchar();  
   printf("%d %c %s\n",e->num,e->sex,e->name);
   printf("修改完畢！\n");
   break;
  }
  e=e->next;
 }
 return -1;
}
int main()
{
 int num_1;
 int num,i;
 head=(S *)malloc(sizeof(S));
 p=(S *)malloc(sizeof(S));
 /*head->num=100;
 head->sex='m';
 strcpy(head->name,"zhangsan");
 head->next=NULL;*/
 p=head;//這是一個(gè)頭節(jié)點(diǎn)
 printf("請(qǐng)輸入y,回車后輸入數(shù)據(jù):\n");
 for(i=0;i<99999;i++)
 {
  fflush(stdin);
  switch(getchar())
  {
   case 'y': Add();
   break;
   case 'c':
   printf("輸入學(xué)號(hào)查找：\n");
   scanf("%d",&num);
   Find(num);
   break;
   case 's':
   printf("輸入修改的學(xué)號(hào)：\n");
   scanf("%d",&num_1);
   renew(num_1);
   break;
   case 'h':
   printf("輸入刪除的學(xué)號(hào)：\n");
   scanf("%d",&num);
   DeleteNote(num);
   break;

   case 'x': print();
   break;
   default:return 0;
  }
  printf("輸入y繼續(xù)，c查找，s更改，h刪除，其他字符結(jié)束\n");

 }
 system("cls");
 return 0;
}