C语言数据结构——简单行编辑(课程设计)

学了一学期的数据结构 ，个人感觉该课程重在思想，只要思路正确，就肯定可以编出好程序来。选了简单行编辑的课程设计 ，里面主要用到的数据结构有指针链表。C语言 方面用到了很多文件读写操作。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <conio.h>
#include <windows.h>                    

#define OK 0
typedef struct linedit
{
 char string[80];                       
 struct linedit *next;                  
 struct linedit *pre;                   
 int len;                               
 int dflag;                             
}linedit;
FILE *fp,*pf;                          
linedit *head;                             
int n=0,sum,delsizen,change=0,page=0,pflag=0;
int x0,y0;                              
                                        
                                                                                 
void gotoxy(int x,int y);               
void Createlist();
void freemem();
int initFile();
int display();
int saveanddisplay(int col);
int saveall();
int delet();
int insert();

                                        
void gotoxy(int x,int y)                
{
 COORD coord;
 coord.X=x;
 coord.Y=y;
 SetConsoleCursorPosition( GetStdHandle( STD_OUTPUT_HANDLE ), coord );
}                                        
void Createlist()                                 
{
 linedit *p1,*p2;
 system("cls");
 if(!fp||!pf)                                     
 {
  printf("建立链表失败，你应该先进行打开文件操作(初始化文件)！");
  printf("按任意键返回...");
  getch();
  return;
 }
 p1=p2=(linedit *)malloc(sizeof(linedit));        
 head=NULL;
 while(n<10)
 {
  n=n+1;                                     &n