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#include<stdio.h>
#include<malloc.h>
#include<string.h>

typedef struct elem/*定义接点*/
  {
   char name[10];
   struct elem *next;
  }create;

create *head,*van,*cur,*temp;/*定义头接点(head),前驱接点(van),当前接点(cur),零时接点(temp)*/

void menu()/*创建菜单*/
  {
   printf("\t\t\t1.创建新链表------[1]\n");
   printf("\t\t\t2.插入新元素------[2]\n");
   printf("\t\t\t3.删除旧元素------[3]\n");
   printf("\t\t\t4.查找旧元素------[4]\n");
   printf("\t\t\t5.倒置原链表------[5]\n");
   printf("\t\t\t6.显示所有元素----[6]\n");
   printf("\t\t\t7.退出------------[7]\n\n");
   printf("请选择(1~7): ");
  }
void new(int n)/*创建新链表,参数n为链表长度*/
  {
   int i;
   printf("\n");
   if((head=(create *)malloc(sizeof(create)))==NULL)/*定义头接点*/
     {
      printf("\n不能创建链表");
      exit(1);
     }
   van=head;/*将前驱接点指针指向头接点*/
   for(i=1;i<=n;i++)
     {
      if((cur=(create *)malloc(sizeof(create)))==NULL)/*定义新接点*/
        {
         printf("\n不能创建链表");
         exit(1);
        }
      cur->next=NULL;/*将当前接点的后继指针置空*/
      van->next=cur;/*连接接点*/
      printf("输入第%d个人的名字: ",i);
      scanf("%s",&cur->name);/*输入当前接点的数据域内容*/
      van=cur;
     }
  }

create *research(char searchname[10])/*查找接点函数*/
  {
   van=head;
   temp=head->next;
   while(temp!=NULL)
     {
      if(strcmp(temp->name,searchname)==0)
        {
         return(temp);
        }
      else
        {
         van=temp;
         temp=temp->next;
        }
     }
   return(temp);
  }

void print()/*显示链表函数*/
  {
   temp=head->next;
   printf("\n");
   while(temp!=NULL)
     {
      printf("%s  ",temp->name);
      temp=temp->next;
     }
  }

void insert(create *insert_point,char insert_name[10])/*插入接点函数*/
  {
   if((cur=(create *)malloc(sizeof(create)))==NULL)
     {
      printf("\n不能创建链表");
      exit(1);
     }
   stpcpy(cur->name,insert_name);
   cur->next=insert_point->next;
   insert_point->next=cur;
  }
void delete(create *delete_point)/*删除接点函数*/
  {
   van->next=delete_point->next;
   free(delete_point);
  }
int turnlist()/*倒置链表函数*/
  {
   van=head->next;
   cur=van->next;
   van->next=NULL;
   while(cur!=NULL)
     {
      temp=cur->next;
      cur->next=van;
      van=cur;
      cur=temp;
     }
   head->next=van;
  }  
main()
{
 int select,length;
 char tempname[10];
 head=NULL;
 while(1)
   {
    clrscr();
    menu();
    scanf("%d",&select);
    switch(select)
      {
       case 1:             
              printf("\n请输入你要建立的链表的长度: ");
              scanf("%d",&length);
              new(length);
              printf("\n链表已创建,按任意键返回\n");
              getch();
              break;     
       case 2:         
              if(head==NULL)
                {
                 printf("\n请先建立链表,按任意键返回 \n");
                 getch();
                 break;
                }   
              printf("\n以下为链表中原有元素: ");
              print();
              printf("\n请输入你要在哪个名字后面插入新名字: ");
              scanf("%s",&tempname);
              temp=research(tempname);
              if((temp=research(tempname))==NULL)
                {
                 printf("\n没有找到你要输入的名字,按任意键返回\n");
                 getch();
                }
              else
                {
                 printf("\n请输入你要插入的名字: ");
                 scanf("%s",&tempname);
                 insert(temp,tempname);
                 printf("\n插入成功，以下为插入后的链表: ");
                 print();             
                 printf("\n按任意键返回\n");
                 getch();
                }
              break;
       case 3:
              if(head==NULL)
                {
                 printf("\n请先建立链表,按任意键返回 \n");
                 getch();
                 break;
                }
              printf("\n以下为链表中原有元素: ");
              print();
              printf("\n请输入你要删除的名字: ");
              scanf("%s",&tempname);
              temp=research(tempname);
              if((temp=research(tempname))==NULL)
                {
                 printf("\n没有找到你要删除的名字,按任意键返回\n");
                 getch();
                }
              else
                {
                 delete(temp);
                 printf("\n删除成功，以下为删除后的链表: ");
                 print();             
                 printf("\n按任意键返回\n");
                 getch();
                }
              break;             
       case 4:
              if(head==NULL)
                {
                 printf("\n请先建立链表,按任意键返回   \n");
                 getch();
                 break;
                }
              printf("\n输入你要查找的名字: ");
              scanf("%s",&tempname);        
              if((temp=research(tempname))==NULL)
                {
                 printf("\n没有找到你要找的名字,按任意键返回\n");
                 getch();
                }
              else
                {
                 printf("\n找到你要找的名字: %s",temp->name);
                 printf("\n\n按任意键返回\n");
                 getch();
                }
              break;  
       case 5:
              printf("\n以下为原链表:");
              print();
              printf("\n\n以下为倒置后的链表:");
              turnlist();
              print();
              printf("\n\n倒置成功,按任意键返回\n");
              getch();             
              break;      
       case 6:
              if(head==NULL)
                {
                 printf("\n请先建立链表,按任意键返回   \n");
                 getch();
                 break;
                }
              printf("\n以下为你链表中的所有元素: ");
              print();
              printf("\n\n按任意键返回");
              printf("\n");
              getch();
              break;                    
       case 7:
              printf("\n谢谢使用,按任意键退出");
              getch();
              exit(0);
              break;
       default:
               printf("\n输入错误，请重新选择，按任意键返回\n");
               getch();
               clrscr();
      }
   }
}