#include 
#include 
#include 
#include 
#include 
#include 
char buf[255]; 
char c=14; 
char path[]="D:\\data"; 
char tmp[]="D:\\tmp"; 
struct Student 
{ 
  char Name[20]; 
  char No[20]; 
  char Dept[20]; 
  char ClassNo[20]; 
  double Math,Chinese,English; 
  double Ave; 
  bool Pass; 
}students[500]; 
bool cmp1(Student s1,Student s2) 
{ 
  return s1.Chinese>s2.Chinese; 
} 
bool cmp2(Student s1,Student s2) 
{ 
  return s1.Math>s2.Math; 
} 
bool cmp3(Student s1,Student s2) 
{ 
  return s1.English>s2.English; 
} 
bool cmp4(Student s1,Student s2) 
{ 
  return s1.Ave>s2.Ave; 
} 
//---------------------------------------------------------void Sort(int cmd) 
/* 
1 ChineseSort 
2 MathSort 
3 EnglishSort 
4 AveSort 
*/ 
int Sort(int cmd) 
{ 
  Student stu; 
  FILE *fp=fopen(path,"ab+"); 
  int n,cnt=0; 
  while((n=fread(&stu,sizeof(stu),1,fp)>0)) 
  { 
    students[cnt++]=stu; 
  } 
  fclose(fp); 
  switch(cmd) 
  { 
  case 1: 
  std::sort(students,students+cnt,cmp1); 
    break; 
  case 2: 
  std::sort(students,students+cnt,cmp2); 
    break; 
  case 3: 
  std::sort(students,students+cnt,cmp3); 
    break; 
  case 4: 
  std::sort(students,students+cnt,cmp4); 
    break; 
  default: 
    exit(0); 
  } 
  return cnt; 
} 
//---------------------------------------------------------PrintTitle() 
void PrintTitle() 
{ 
  printf("%-8s%-12s%-12s%-8s%-7s%-7s%-7s%-7s%-s\n","姓名","班级","学号","系院","语文","数学","英语","平均分","及格"); 
} 
//---------------------------------------------------------Print(Student stu) 
void Print(Student stu) 
{ 
  printf("%-8s%-12s%-12s%-8s%-7.2lf%-7.2lf%-7.2lf%-7.2lf%-s\n",stu.Name,stu.ClassNo,stu.No,stu.Dept,stu.Chinese,stu.Math,stu.English,stu.Ave,stu.Pass?"是":"否"); 
} 
//---------------------------------------------------------PrintNo(char No[]) 
void PrintNo(char No[]) 
{ 
  Student stu; 
  int n; 
  bool find=0; 
  FILE *fp=fopen(path,"ab+");//以ab+方式打开防止data文件不存在时发生错误 
  while((n=fread(&stu,sizeof(stu),1,fp))>0) 
  { 
    if(!strcmp(stu.No,No)) 
    { 
      find=1; 
      break; 
    } 
  } 
  fclose(fp); 
  if(find) 
  { 
    PrintTitle(); 
    Print(stu); 
  } 
  else 
    puts("未找到！"); 
} 
//---------------------------------------------------------PrintClass(char ClassNo[]) 
void PrintClass(char ClassNo[]) 
{ 
  Student stu; 
  FILE *fp=fopen(path,"ab+"); 
  int n,cnt=0; 
  while((n=fread(&stu,sizeof(stu),1,fp)>0)) 
  { 
    if(!strcmp(stu.ClassNo,ClassNo)) 
    { 
      if(cnt==0) 
        PrintTitle(); 
      Print(stu); 
      cnt++; 
    } 
  } 
  fclose(fp); 
  if(cnt==0) 
    puts("无数据"); 
  else 
    printf("共%d条\n",cnt); 
} 
//---------------------------------------------------------PrintDept(char Dept[]) 
void PrintDept(char Dept[]) 
{ 
    Student stu; 
  FILE *fp=fopen(path,"ab+"); 
  int n,cnt=0; 
  while((n=fread(&stu,sizeof(stu),1,fp)>0)) 
  { 
    if(!strcmp(stu.Dept,Dept)) 
    { 
      if(cnt==0) 
        PrintTitle(); 
      Print(stu); 
      cnt++; 
    } 
  } 
  fclose(fp); 
  if(cnt==0) 
    puts("无数据"); 
  else 
    printf("共%d条\n",cnt); 
} 
//---------------------------------------------------------PrintAll() 
void PrintAll() 
{ 
  Student stu; 
  FILE *fp=fopen(path,"ab+"); 
  int n,cnt=0; 
  while((n=fread(&stu,sizeof(stu),1,fp)>0)) 
  { 
    if(cnt==0) 
      PrintTitle(); 
    Print(stu); 
    cnt++; 
  } 
  fclose(fp); 
  if(cnt==0) 
    puts("无数据"); 
  else 
    printf("共%d条\n",cnt); 
} 
//---------------------------------------------------------Input() 
Student Input() 
{ 
  Student stu; 
  puts("请输入姓名、班级、学号、系院:"); 
  scanf("%s%s%s%s",&stu.Name,&stu.ClassNo,&stu.No,&stu.Dept); 
  puts("请输入各科成绩：语文、数学、英语"); 
  scanf("%lf%lf%lf",&stu.Chinese,&stu.Math,&stu.English); 
  stu.Ave=(stu.Chinese+stu.Math+stu.English)/3; 
  if(stu.Chinese>=60&&stu.Math>=60&&stu.English>=60) 
    stu.Pass=1; 
  else 
    stu.Pass=0; 
  return stu; 
} 
//---------------------------------------------------------Insert() 
void Insert() 
{ 
  int cmd; 
  do{ 
    Student stu=Input(); 
    FILE *fp=fopen(path,"ab+"); 
    fwrite(&stu,sizeof(stu),1,fp); 
    fclose(fp); 
    puts("录入成功"); 
    puts("继续录入吗？[1]是[0]否"); 
    scanf("%d",&cmd); 
  }while(cmd==1); 
} 
//---------------------------------------------------------Del() 
void Del() 
{ 
  int cmd,cmd2; 
  char No[20]; 
  do{ 
  puts("请输入要删除的学号："); 
  scanf("%s",&No); 
  Student stu; 
  FILE *fp=fopen(path,"ab+"); 
  FILE *fp2=fopen(tmp,"wb"); 
  int n,find=0; 
  while((n=fread(&stu,sizeof(stu),1,fp))>0) 
  { 
    if(!strcmp(stu.No,No)) 
    { 
      find=1; 
      Print(stu); 
      puts("确定要删除吗？[1]确定[0]取消"); 
      scanf("%d",&cmd2); 
      if(cmd2==1) 
        puts("已删除"); 
      else 
        fwrite(&stu,sizeof(stu),1,fp2); 
    } 
    else 
    fwrite(&stu,sizeof(stu),1,fp2); 
  } 
  fclose(fp); 
  fclose(fp2); 
  if(find==0) 
  { 
    printf("未找到学号%s\n",No); 
    remove(tmp); 
  } 
  else 
  { 
    remove(path); 
    rename(tmp,path); 
  } 
  puts("继续删除吗？[1]是[0]否"); 
  scanf("%d",&cmd); 
  }while(cmd==1); 
} 
//---------------------------------------------------------Change() 
void Change() 
{   
  int cmd; 
  char No[20]; 
  do{ 
  puts("请输入要更改的学号："); 
  scanf("%s",&No); 
  Student stu; 
  int find=0; 
  FILE *fp=fopen(path,"ab+"); 
  FILE *fp2=fopen(tmp,"wb"); 
  int n; 
  while((n=fread(&stu,sizeof(stu),1,fp))>0) 
  { 
    if(!strcmp(stu.No,No)) 
    { 
      find=1; 
      stu=Input(); 
      fwrite(&stu,sizeof(stu),1,fp2); 
    } 
    else 
      fwrite(&stu,sizeof(stu),1,fp2); 
  } 
  fclose(fp); 
  fclose(fp2); 
  if(find) 
  { 
    remove(path); 
    rename(tmp,path); 
    puts("更改成功！"); 
  } 
  else 
  { 
    printf("未找到学号%s\n",No); 
    remove(tmp); 
  } 
  puts("继续更改吗？[1]是[0]否"); 
  scanf("%d",&cmd); 
  }while(cmd==1); 
} 
//---------------------------------------------------------AboutCourse 
void Chinese() 
{ 
  double sum=0,ave; 
  int pass=0,fail=0,better=0; 
  Student stu; 
  FILE *fp=fopen(path,"ab+"); 
  int n,cnt=Sort(1); 
  while((n=fread(&stu,sizeof(stu),1,fp))>0) 
  { 
    sum+=stu.Chinese; 
    if(stu.Chinese>=60) 
      { 
        pass++; 
        if(stu.Chinese>=80) 
          better++; 
      } 
    else 
      fail++; 
  } 
  ave=sum/cnt; 
  puts("语文成绩分析……"); 
  printf("共有%d学生\n优秀：%d人\n及格：%d人\n不及格：%d人\n及格率：%.2lf%%\n",cnt,better,pass,fail,100.0*pass/cnt); 
  printf("%-8s%-10s%-12s%-s\n","名次","姓名","学号","语文"); 
  for(int i=0;i0) 
  { 
    sum+=stu.Math; 
    if(stu.Math>=60) 
      { 
        pass++; 
        if(stu.Math>=80) 
          better++; 
      } 
    else 
      fail++; 
  } 
  ave=sum/cnt; 
  puts("数学成绩分析……"); 
  printf("共有%d学生\n优秀：%d人\n及格：%d人\n不及格：%d人\n及格率：%.2lf%%\n",cnt,better,pass,fail,100.0*pass/cnt); 
  printf("%-8s%-10s%-12s%-s\n","名次","姓名","学号","数学"); 
  for(int i=0;i0) 
  {   
    sum+=stu.English; 
    if(stu.English>=60) 
      { 
        pass++; 
        if(stu.English>=80) 
          better++; 
      } 
    else 
      fail++; 
  } 
  ave=sum/cnt; 
  puts("英语成绩分析……"); 
  printf("共有%d学生\n优秀：%d人\n及格：%d人\n不及格：%d人\n及格率：%.2lf%%\n",cnt,better,pass,fail,100.0*pass/cnt); 
  printf("%-8s%-10s%-12s%-s\n","名次","姓名","学号","英语"); 
  for(int i=0;i0) 
  {   
    sum+=stu.Chinese; 
    sum+=stu.Math; 
    sum+=stu.English; 
  } 
  puts("平均成绩分析……"); 
  printf("%-8s%-10s%-12s%-s\n","名次","姓名","学号","平均成绩"); 
  for(int i=0;i