C语言实现的小型数据库管理系统

#include <stdio.h>
#include <string.h>
typedef struct count{                                    /*保存记录条数结构体*/
   char name[10];
   int num;
}count;

typedef struct st{
   char name[10];
   long Number;
   int Math;
   int C;
   int Amount;
}st;
st record[8];
count num[1]; 
char filename[10]={"0"};
char filename2[10]={"0"};
int Inputnum[8];

void MainMenu(){                                       /*主菜单*/
   printf("\n\t\t\t\t* * * * * * * * * *\n");
   printf("\t\t\t\t*      主菜单     *\n");
   printf("\t\t\t\t*  1. 创建新文件  *\n");
   printf("\t\t\t\t*  2. 添加记录    *\n");
   printf("\t\t\t\t*  3. 删除记录    *\n");
   printf("\t\t\t\t*  4. 排序        *\n");
   printf("\t\t\t\t*  5. 查询记录    *\n");
   printf("\t\t\t\t*  6. 退出        *\n");
   printf("\t\t\t\t* * * * * * * * * *\n");

}

void DelMenu(){                                              /*删除菜单*/
   printf("\n\t\t\t\t* * * * * * * * * * * *\n");
   printf("\t\t\t\t*      删除菜单       *\n");
   printf("\t\t\t\t*  1. 学号查询删除    *\n");
   printf("\t\t\t\t*  2. 返回到上级菜单  *\n");
   printf("\t\t\t\t* * * * * * * * * * * *\n");
}

void RankingMenu(){                                          /*排序菜单*/
   printf("\n\t\t\t\t* * * * * * * * * * * *\n");
   printf("\t\t\t\t*      排序菜单       *\n");
   printf("\t\t\t\t*  1. 数学成绩排序    *\n");
   printf("\t\t\t\t*  2. C语言成绩排序   *\n");
   printf("\t\t\t\t*  3. 总分排序        *\n");
   printf("\t\t\t\t*  4. 返回到上级菜单  *\n");
   printf("\t\t\t\t* * * * * * * * * * * *\n");
}

void InquireMenu(){                                          /*查讯菜单*/
   printf("\n\t\t\t\t* * * * * * * * * * * *\n");
   printf("\t\t\t\t*       查讯菜单      *\n");
   printf("\t\t\t\t*  1. 学号查讯        *\n");
   printf("\t\t\t\t*  2. 姓名查讯        *\n");
   printf("\t\t\t\t*  3. 数学成绩查讯    *\n");
   printf("\t\t\t\t*  4. C语言成绩查讯   *\n");
   printf("\t\t\t\t*  5. 总分查讯        *\n");
   printf("\t\t\t\t*  6. 返回到上级菜单  *\n");
   printf("\t\t\t\t* * * * * * * * * * * *\n");