C语言实现线性表操作

#include<stdio.h>/#include<conio.h>
#include<stdlib.h>                /*调用清屏函数*/
typedef struct Ln{                /*定义链表*/
   int data;
   struct Ln *next;
}Ln,*LinkList;
LinkList L,p,q,s;
int order,value,k,length,a,b,e,i,j;
void main()
{ void initlise();          
  void list();
  void listempty();
  void clearlist();
  void listlength();
  void getelem();
  void getprior();
  void insert();
  void deletef();               /*函数声明*/
  void menu();   
  menu();                      
  printf("please enter your order:");    /*输入控制执行的一个数*/
  scanf("%d",&order);
  if(order<0||order>10) {
    printf("invalid number,please input again(0-10)!\n");
    printf("please enter your order:");
    scanf("%d",&order);
    }
  
while(order!=0)
 {

  switch(order)
  { case 1:initlise();break;
    case 2:list();break;
    case 3:listempty();break;
    case 4:clearlist();break;
    case 5:listlength();break;
    case 6:getelem();break;
    case 7:getprior();break;
    case 8:insert();break;
    case 9:deletef();break;
    case 10:clrscr();menu();break;
    case 0:break;
    default:printf("Invalid number!again."); 
            
  }
   printf("please enter your order:");    /*输入控制执行的一个数*/
  scanf("%d",&order);
  
 }
}
void menu(){
     
     printf("*****************************************************\n");
     printf("*              Welcome to use ！                    *\n");
     printf("*              Function menu                        *\n");
     printf("*****************************************************\n");
     printf("*      1    Initialization of the list              *\n");
     printf("*      2    Input the  list                         *\n");
     printf("*      3    Check whether the list is empty         *\n");
     printf("*      4    clear the list                          *\n");