C语言版学生成绩管理系统

本文实例为大家分享了C语言版学生成绩管理系统的具体代码，供大家参考，具体内容如下

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<conio.h>
#include<string.h>
#include<algorithm>
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;i<cnt;i++)
  {
    printf("第%2d名 %-10s%-12s%-8.2lf\n",i+1,students[i].Name,students[i].No,students[i].Chinese);
  }
  printf("平均分：%.2lf\n",ave);
}
void Math()
{
  double sum=0,ave;
  int pass=0,fail=0,better=0;
  Student stu;
  FILE *fp=fopen(path,"ab+");
  int n,cnt=Sort(2);
  while((n=fread(&stu,sizeof(stu),1,fp))>0)
  {
    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;i<cnt;i++)
  {
    printf("第%2d名 %-10s%-12s%-8.2lf\n",i+1,students[i].Name,students[i].No,students[i].Math);
  }
  printf("平均分：%.2lf\n",ave);
}
void English()
{
  double sum=0,ave;
  int pass=0,fail=0,better=0;
  Student stu;
  FILE *fp=fopen(path,"ab+");
  int n,cnt=Sort(3);
  while((n=fread(&stu,sizeof(stu),1,fp))>0)
  {
    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;i<cnt;i++)
  {
    printf("第%2d名 %-10s%-12s%-8.2lf\n",i+1,students[i].Name,students[i].No,students[i].English);
  }
  printf("平均分：%.2lf\n",ave);
}
void Average()
{
  Student stu;
  int n,cnt=Sort(4);
  double sum=0;
  FILE *fp=fopen(path,"ab+");
  while((n=fread(&stu,sizeof(stu),1,fp))>0)
  {
    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<cnt;i++)
  {
    printf("第%2d名 %-10s%-12s%-8.2lf\n",i+1,students[i].Name,students[i].No,students[i].Ave);
  }
  printf("平均分：%.2lf\n",sum/cnt/3);
}
//---------------------------------------------------------Search()
void Search()
{
  int cmd,cmd2;
  while(1)
  {
    system("cls");
    puts("[1] 按学号查询");
    puts("[2] 按班级查询");
    puts("[3] 输出全部");
    puts("[4] 按系别查询");
    puts("[5] 课程分析");
    puts("[0] 返回主界面");
    scanf("%d",&cmd);
    if(cmd==0)
      break;
    switch(cmd)
    {
    case 1:
      {
      char No[20];
      puts("请输入要查询的学号：");
      scanf("%s",&No);
      PrintNo(No);
      }
      break;
    case 2:
      {
        char ClassNo[20];
        puts("请输入要查询班级号：");
        scanf("%s",&ClassNo);
        PrintClass(ClassNo);
      }
      break;
    case 3:
      PrintAll();
      break;
    case 4:
      {
        char Dept[20];
        puts("请输入要查询的系别：");
        scanf("%s",&Dept);
        PrintDept(Dept);
      }
      break;
    case 5:
      while(1)
      {
        puts("[1] 语文成绩分析");
        puts("[2] 数学成绩分析");
        puts("[3] 英语成绩分析");
        puts("[4] 平均成绩分析");
        puts("[0] 返回上一级");
        scanf("%d",&cmd2);
        if(cmd2==0)
          break;
        switch(cmd2)
        {
        case 1:
          Chinese();
          break;
        case 2:
          Math();
          break;
        case 3:
          English();
          break;
        case 4:
          Average();
          break;
        default:
          puts("不合法指令！");
        }
      }
      break;
    default:
      puts("不合法指令！");
    }
    while(1)
    {
      puts("[0] 返回");
      puts("[1] 录入");
      puts("[2] 删除");
      puts("[3] 修改");
      scanf("%d",&cmd2);
      if(cmd2==0)
        break;
      switch(cmd2)
      {
      case 1:
        Insert();
          break;
      case 2:
        Del();
        break;
      case 3:
        Change();
        break;
      default:
        puts("不合法指令！");
      }
    }
  }
}
//---------------------------------------------------------Menu()
void ShowMenu1()
{
  int i;
  puts("");
  printf("         ");
  for(i=0;i<14;i++)
    putchar(c);
  printf("成绩管理分析系统");
  for(i=0;i<14;i++)
    putchar(c);
  puts("");
  printf("        %c                       %c\n",c,c);
  printf("         %c        请输入指令        %c\n",c,c);
  printf("        %c                       %c\n",c,c);
  printf("         %c        [0] 退出         %c\n",c,c);
  printf("        %c                       %c\n",c,c);
  printf("         %c        [1] 录入         %c\n",c,c);
  printf("        %c                       %c\n",c,c);
  printf("         %c        [2] 删除         %c\n",c,c);
  printf("        %c                       %c\n",c,c);
  printf("         %c        [3] 查询         %c\n",c,c);
  printf("        %c                       %c\n",c,c);
  printf("         %c        [4] 更改         %c\n",c,c);
  printf("        %c                       %c\n",c,c);
  printf("         ");
  for(i=0;i<44;i++)
    putchar(c);
  puts("");
}
void ShowMenu2()
{
  int i;
  puts("");
  printf("         ");
  for(i=0;i<14;i++)
    putchar(c);
  printf("成绩管理分析系统");
  for(i=0;i<14;i++)
    putchar(c);
  puts("");
  printf("         %c                     %c\n",c,c);
  printf("        %c         请输入指令         %c\n",c,c);
  printf("         %c                     %c\n",c,c);
  printf("        %c         [0] 退出          %c\n",c,c);
  printf("         %c                     %c\n",c,c);
  printf("        %c         [1] 录入          %c\n",c,c);
  printf("         %c                     %c\n",c,c);
  printf("        %c         [2] 删除          %c\n",c,c);
  printf("         %c                     %c\n",c,c);
  printf("        %c         [3] 查询          %c\n",c,c);
  printf("         %c                     %c\n",c,c);
  printf("        %c         [4] 更改          %c\n",c,c);
  printf("         %c                     %c\n",c,c);
  printf("         ");
  for(i=0;i<44;i++)
    putchar(c);
  puts("");
}
//---------------------------------------------------------void RandColor()
void RandColor()
{
  int a,b;
  char param[20]="color ",param2[10];
  do{
    a=rand()%16;
    b=rand()%16;
  }while(a==b);
  sprintf(param2,"%x%x",a,b);
  strcat(param,param2);
  system(param);
}
//---------------------------------------------------------main()
int main()
{
  int cmd;
  srand(time(NULL));
  for(int i=0;i<8;i++)
  {
  RandColor();
  system("cls");
  ShowMenu1();
  system("cls");
  ShowMenu2();
  }
  system("color 0a");
  while(1)
  {
    system("cls");
    ShowMenu1();
    printf("[ ]\b\b");
    scanf("%d",&cmd);
    if(cmd==0)
      break;
    switch(cmd)
    {
    case 1:
      Insert();
      break;
    case 2:
      Del();
      break;
    case 3:
      Search();
      break;
    case 4:
      Change();
      break;
    default:
      puts("命令不合法！");
    }
  }
  return 0;
} 

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