#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct course
	{
		char name[100];
		char kind[30];
		int num;
		int time;
		int ttime;
		int etime;
		int mark;
		int term;
	};
struct student
   {
   	    char snum[11];
   	    int cnum;
   	    char cname[100];
   };
void insert() /*输入信息*/ 
{  int main();
   FILE *fp;
   struct course c;
   int secret=112112;
   int secret1;
   int n;
   system("cls");
   if((fp=fopen("course.txt","a+"))==NULL)
   {printf("cannot open course\n");}
   printf("请输入密码："); 
   scanf("%d",&secret1);
   if(secret1==secret)
   {
      printf("密码输入正确，请输入课程门数：");
      scanf("%d",&n);
      printf("课程编号  课程名称  课程性质  总学时  授课学时  实验学时  学分  开课学期：\n");
      for(int i=1;i<=n;i++)
      { 
	    scanf("%d %s %s %d %d %d %d %d",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
      	fprintf(fp,"%d %s %s %d %d %d %d %d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
	  }
   }
   else
   printf("你输入的密码有误，请重试");
   fclose(fp);
   main();
}

void browser() /*信息浏览*/ 
{ int main();
  FILE *fp;
  struct course c;
  system("cls");
  if((fp=fopen("course.txt","r"))==NULL)
  {printf("cannot open course\n");}
  printf("课程编号  课程名称  课程性质  总学时  授课学时  实验学时  学分  开课学期：\n");
  for(;!feof(fp);)
   {
	fscanf(fp,"%d%s%s%d%d%d%d%d",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
	printf("%5d%12s%9s%9d%9d%11d%7d%7d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
   }
   fclose(fp);
   main();
}

void search() /*信息查询*/ 
{   int main();
    FILE *fp;
    struct course c;
    int score,b;
    system("cls");
    loop:
    printf("1.按学分查询  2.按课程性质查询\n");
    printf("请选择查询方式，输入选项数字：");
    scanf("%d",&b);
    if(b==1)
    {
    	printf("请输入您要查询的学分:");
        scanf("%d",&score);
        if((fp=fopen("course.txt","r"))==NULL)
        {
            printf("cannot open course!\n");
        }
        else
        printf("课程编号  课程名称  课程性质  总学时  授课学时  实验或上机学时  学分  开课学期:\n");
        for(;!feof(fp);) 
        {
          fscanf(fp,"%d%s%s%d%d%d%d%d",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
	      if(score==c.mark)
	      printf("%5d%12s%9s%9d%9d%11d%7d%7d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
		}
	}
    else if(b==2)
   {
   	    char kind1[10]; 
   	    system("cls");
   	    printf("请输入您要查询的课程性质:");
        scanf("%s",&kind1);
        if((fp=fopen("course.txt","r"))==NULL)
        {
            printf("cannot open course!\n");
        }
       else
        printf("课程编号  课程名称  课程性质  总学时  授课学时  实验或上机学时  学分  开课学期:\n");
        for(;!feof(fp);)
        {
        	fscanf(fp,"%d%s%s%d%d%d%d%d\n",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
        	if(strcmp(c.kind,kind1)==0)
        	printf("%5d%12s%9s%9d%9d%11d%10d%10d\n",c.num,c.name,c.kind,c.time,c.ttime,c.etime,c.mark,c.term);
		}
	}
	else
	{ printf("输入有误\n"); goto loop;} 
    fclose(fp);
    main();
}

void xuankeinformation() /*学生选课情况*/ 
{    int main();
	FILE *fp;
	struct student s;
	system("cls");
	if((fp=fopen("student.txt","r"))==NULL)
        {
            printf("cannot open course!\n");
        }
	printf("  学号        课程编号         课程名称  \n");
	for(;!feof(fp);)
	{
		fscanf(fp,"%s %d %s",&s.snum,&s.cnum,&s.cname);
		printf("%7s %5d %17s\n",s.snum,s.cnum,s.cname);
	}
	fclose(fp);
   main();
}

void xuanke()  /*学生进行选课*/ 
{   
    int main();
	FILE *fp;
	struct student s;
	struct course c;
	system("cls");
	printf("请输入你的学号以及想选的课程的编号\n");
    scanf("%s %d",&s.snum,&s.cnum);
	if((fp=fopen("course.txt","r"))==NULL)
        {
            printf("cannot open course!\n");
        }
    for(;!feof(fp);)
    {
    	fscanf(fp,"%d %s %s %d %d %d %d %d\n",&c.num,&c.name,&c.kind,&c.time,&c.ttime,&c.etime,&c.mark,&c.term);
    	if(c.num==s.cnum)
    	break;
	}
	fclose(fp);
	if((fp=fopen("student.txt","a+"))==NULL)
	{
		printf("cannot open student!\n");
	}
	fprintf(fp,"%s %d %s\n",s.snum,s.cnum,c.name);
	fclose(fp);
	main();
}

int main()
{   
    loop:
	printf("\n\n");
	printf("                    学生选修课程系统                    \n\n\n");
	printf("          ********   1.课程信息录入      ********                    \n");
	printf("          ********   2.课程信息浏览      ********                    \n");
	printf("          ********   3.课程信息查询      ********                    \n"); 
	printf("          ********   4.学生选修课程统计  ********                    \n");
	printf("          ********   5.选课              ********                    \n");
	printf("          ********   0.退出              ********                    \n");
	printf("请输入你想选择的数字\n");
    int x;
	scanf("%d",&x);
	switch(x)
	{
	case 1:insert();break; 
	case 2:browser(); break;
	case 3:search(); break;
	case 4:xuankeinformation(); break;
	case 5:xuanke(); break;
	case 0:exit(0);break;
	default:printf("你的选择有错误！"); goto loop; 
    }
	return 0;
}