学生信息管理分析系统

#include<stdio.h>

#include<malloc.h>

#include<string.h>

#include<stdlib.h>

 struct student

 {

  int num;

  char name[20];

  int  math;

  int  pe;   

  struct student *next;          

 };

int n=0;

void print(struct student *head)

{

      struct student *p;    

      p=head;

      printf("学生学号 姓名 数学成绩 体育成绩\n");

      if(head!=NULL)

      do{

          printf("%d ,%s ,%d ,%d\n",p->num,p->name,p->math,p->pe);

          p=p->next;                 

      }while(p!=NULL);   

}

struct student *create()

 {

   

     struct  student *head;

     struct  student *p1,*p2;

      n=0;

      p1=p2=(struct student *)malloc(sizeof(struct student));

      printf("请输入学生学号,若学号为0则表示输入结束\n");

      scanf("%d",&p1->num);

      printf("姓名\n");

      scanf("%s",p1->name);

      printf("数学成绩\n");

      scanf("%d",&p1->math);

      printf("体育成绩\n");

      scanf("%d",&p1->pe);

      head=NULL;

      while(p1->num>0)

      {

        n=n+1;

        if(n==1)head=p1;

       else p2->next=p1;

        p2=p1;

        p1=(struct student *)malloc(sizeof(struct student ));

        printf("请输入学生学号,若学号为0则表示输入结束\n");

        scanf("%d",&p1->num);

       printf("姓名\n");

       scanf("%s",p1->name);

       printf("数学成绩\n");

       scanf("%d",&p1->math);

       printf("体育成绩\n");

       scanf("%d",&p1->pe);        

       }       

       p2->next=NULL; 

       print(head);

        return head;    

 }

 

void  modification(struct student *head,int num)//修改

{ 

   struct student *p;

   p=head;

   if(head!=NULL)

  do

   {

    if(p->num==num)

     {  printf("请输入你要重新输入的学生学号\n");

       scanf("%d",&p->num);

       printf("姓名\n");

       scanf("%s",p->name);

       printf("数学成绩\n");

       scanf("%d",&p->math);

       printf("体育成绩\n");

       scanf("%d",&p->pe);

        break;

     }

     p=p->next;

  }while(p!=NULL);

}

struct student *insert(struct student *head,struct student *stu)

 {

   

      struct student *p0,*p1,*p2;

      p1=head;

      p0=stu;

      if(p1==NULL)

      {

       head=p0;

       p0->next=NULL;

      } 

      else

       {

         while((p0->num>p1->num)&&(p1->next!=NULL))    

          {                                         

          p2=p1;                                        

          p1=p1->next;                                        

          }

          if(p0->num<=p1->num)

         {

           if(head==p1)                   

          head=p0;

          else 

           p2->next=p0;

            p0->next=p1;             

          }

         else

          {

            p1->next=p0;

            p0->next=NULL;  

          }

        } 

        n=n+1;

        print(head);

    return (head);     

 }

 

struct student *del(struct student *head,int num)

{

      system("cls");

      struct student *p1,*p2;

     if(head==NULL)

     {

       printf("the list  is null\n");

       return head;             

     }  

     p1=head;

     while(num!=p1->num&&p1->next!=NULL)

     {

      p2=p1;

      p1=p1->next;                                  

     }  

     

     if(num==p1->num)

      {

       if(p1==head)

       head=p1->next;

       else

       p2->next=p1->next;

       printf("已经删除学号为:%d的学生信息\n",num);

       n=n-1;              

      }   

      else

      printf("学号为%d的学生信息不存在\n",num);

      print(head);

      return head;    

}

void  search0(struct student *head,int num)

{

   struct student *p;

   p=head;

   if(head!=NULL)

   do

   {

    if(p->num==num)

     { 

       printf("学生学号 姓名 数学成绩 体育成绩\n");

       printf("%d,%s,%d,%d\n",p->num,p->name,p->math,p->pe);

        break;

     }

     p=p->next;

  }while(p!=NULL);

 

}

void  search1(struct student *head,int math)

{

   struct student *p;

   p=head;

   if(head!=NULL)

  do

   {

    if(p->math==math)

     { 

       printf("学生学号 姓名 数学成绩 体育成绩\n");

       printf("%d,%s,%d,%d\n",p->num,p->name,p->math,p->pe);

        break;

     }

     p=p->next;

  }while(p!=NULL);

}

void  search2(struct student *head,int pe)

{

   struct student *p;

   p=head;

   if(head!=NULL)

  do

   {

    if(p->pe==pe)

     { 

       printf("学生学号 姓名 数学成绩 体育成绩\n");

       printf("%d,%s,%d,%d\n",p->num,p->name,p->math,p->pe);

       break;

     }

     p=p->next;

  }while(p!=NULL);

}

void average(struct student *head)

{

  struct student *p;

  int  num1,num2;

  double  amath=0.0,ape=0.0,max=0,min=0;

  double  i=0.0,j=0.0,k=0.0,l=0.0;

  if(head==NULL)

  {

   printf("没有输入学生信息，无法进行成绩分析\n");

   return ;

  }  

  p=head;

  max=(p->math+p->pe);

  min=(p->math+p->pe);

 while(p!=NULL)

  {

   { amath=amath+p->math;//求总成绩

    ape=ape+p->pe;

    if(p->math>=60)//计数器

     i++;

    if(p->math>=90)

    j++;

    if(p->pe>=60)

     k++;

    if(p->pe>=90)

    l++;

     if((p->math+p->pe)>max)// 记录成绩最高者学号

     {

      max=p->math+p->pe;

      num1=p->num;

     }

     if((p->math+p->pe)<min)// 记录成绩最小者学号

     {

      min=p->math+p->pe;

      num2=p->num;

     }

   }

   p=p->next;          

  }

 printf("数学平均成绩=%lf\n",amath/n);//数学

 printf("数学及格率=%lf\n",i/n);

 printf("数学优秀率=%lf\n",j/n);

 printf("体育平均成绩=%lf\n",ape/n);//体育

 printf("体育及格率=%lf\n",k/n);

 printf("体育优秀率=%lf\n",l/n);

 printf("课程平均成绩=%lf\n",(amath+ape)/n);

 printf("最高的总分=%lf\n",max);

 printf("最低的总分=%lf\n",min);

}

void  sort(struct student *head )

{

   int i=0,j,k;

  struct student *p,*q;

  p=head;

  int a[100],b[100],t,m;

  while(n)

  {

   a[i]=p->math;

   b[i]=p->pe;

   i++;

   n--;

   p=p->next;     

  }

 for(j=0;j<i-1;j++)

  {

   for(k=j+1;k<i;k++)                

     {

      if(a[j]<a[k])                               

       {

        t=a[j];

        a[j]=a[k];

        a[k]=t;                               

       }

      if(b[j]<b[k])

      {

       m=b[j];

       b[j]=b[k];

       b[k]=m;                          

      }                                                            

     }                           

  }

  printf("数学成绩从高到低\n");

  for(j=0;j<i;j++)

  printf("%d\t",a[j]);

  printf("\n");

  printf("体育成绩从高到低\n");

  for(j=0;j<i;j++)

  printf("%d\t",b[j]);

  printf("\n");             

}

void  save(struct student *head)

{

     FILE *fp;

    struct student *p;

    p=head;

   if((fp=fopen("stu.txt","wb"))==NULL)

    {

    printf("cannot create  file\n");

     exit(0);

    }

  while(p!=NULL)

    {

    fwrite(p,sizeof(struct student),1,fp);

    p=p->next;

    }

  fclose(fp);

}

struct student * read()

{

 FILE *fp;

    struct  student  *p1,*p2,*head;

    fp=fopen("stu.txt","rb");

    head=p2=p1=(struct student* )malloc(sizeof(struct student));

      while(fread(p1,sizeof(struct student),1,fp))

 {

        n++;

  p2->next = p1;

  p2 = p1;

     p1=(struct student *)malloc(sizeof(struct student));

 }

 p2->next=NULL;

 fclose(fp);

 return head;

}

int meum()

{

   printf("   hello !               teacher          \n");  

   int n;

   printf("############################################\n");

   printf("+++++++++欢迎进入成绩分析系统+++++++++++++++\n");

   printf("############################################\n");

   printf("+++++++++++请选择不同的功能+++++++++++++++\n");

   printf("+++++++++++0:录入学生信息+++++++++++++++++\n");   

   printf("+++++++++++1:删除学生信息+++++++++++++++++\n");  

   printf("+++++++++++2:查找学生信息+++++++++++++++++\n");

   printf("+++++++++++3:修改学生信息+++++++++++++++++\n");

   printf("+++++++++++4:显示学生信息+++++++++++++++++\n");

   printf("+++++++++++5:插入学生信息+++++++++++++++++\n");

   printf("+++++++++++6:分析成绩并排序+++++++++++++++\n");

   printf("+++++++++++7:保存退出系统++++++++++++++++++\n");

   printf("请做出选择[  ]\b\b\b ");

   scanf("%d",&n);

   return n;            

}

int meum1()

{   int n;

   printf("   hello !               student           \n");

   printf("############################################\n");

   printf("+++++++++欢迎进入成绩分析系统+++++++++++++++\n");

   printf("############################################\n");

   printf("+++++++++++请选择不同的功能+++++++++++++++\n");

   printf("+++++++++++0:录入学生信息+++++++++++++++++\n");

   printf("+++++++++++1:查找学生信息+++++++++++++++++\n");

   printf("+++++++++++2:修改学生信息+++++++++++++++++\n"); 

   printf("+++++++++++3:显示学生信息+++++++++++++++++\n");

   printf("+++++++++++4:分析成绩并排序+++++++++++++++\n");

   printf("+++++++++++5:保存退出系统+++++++++++++++++++++\n");

   printf("请做出选择[  ]\b\b\b ");

   scanf("%d",&n);

   return n;            

}

void out()

{ printf("＋＋＋＋＋＋＋＋＋＋＋文件已保存＋＋＋＋＋＋＋＋\n");

  printf("+++++++++++++++++++++++++++++++++++++++++++++++\n");

  printf("++++++你选择了退出学生成绩分析系统+++++++++++++\n");

  printf("++++++欢迎再次进入学生成绩分析系统+++++++++++++\n");

  printf("+++++++++++++++byebye++++++++++++++++++++++++++\n");

  printf("+++++++++++++++++++++++++++++++++++++++++++++++\n");      

}

void  teacher()

{ 

      struct student *head=NULL;

      head=read();

      struct student stu;

      int m,num,math,pe;

  while(1)

  {

      m=meum() ;

     switch(m)

     {   

             case 0:head=create();break;

             case 1:printf("请输入你想删除的学生的学号\n");

                scanf("%d",&num);

                head=del(head,num);

                break;

             case 2 :

                  printf("0:按照学号查找\n");

                  printf("1:按照数学成绩查找\n");

                  printf("2:按照体育成绩查找\n");

                  int n;

                  printf("请做出选择\n");

                  scanf("%d",&n);

                  switch(n)

                  {

                   case 0: printf("请输入你想查找的学生的学号\n");

                      scanf("%d",&num);

                      search0(head,num);

                        break;

                   case 1: printf("请输入你想查找的学生的数学成绩\n");

                      scanf("%d",&math);

                      search1(head,math);

                       break;   

                    case 2: printf("请输入你想查找的学生的体育成绩\n");

                      scanf("%d",&pe);

                      search2(head,pe);

                      break; 

                   }break;   

             case 3:

                     printf("请输入你想修改的学生的学号\n");

                           scanf("%d",&num);

                           modification(head,num);break;

             case 4:print(head);break; 

             case 5:  printf("请输入学生学号\n");

                      scanf("%d",&stu.num);

                      printf("请输入学生姓名\n");

                      scanf("%s",stu.name);

                      printf("请输入学生数学成绩\n");

                      scanf("%d",&stu.math);

                      printf("请输入学生体育成绩\n");

                      scanf("%d",&stu.pe);

                      head=insert(head,&stu);          

                        break;

             case 6:average(head);

                  sort(head);break;

              case 7:save(head); out(head);return;

         }

  }                         

}

void  student()

{ 

      struct student *head=NULL;

      head=read();

      struct student stu;

      int m,num,math,pe;

  while(1)

  {

      m=meum1() ;

     switch(m)

     {   

         

              case 0:head=create();break;

              case 1 :

                  printf("0:按照学号查找\n");

                  printf("1:按照数学成绩查找\n");

                  printf("2:按照体育成绩查找\n");

                  int n;

                  printf("请做出选择\n");

                  scanf("%d",&n);

                  switch(n)

                  {

                   case 0: printf("请输入你想查找的学生的学号\n");

                      scanf("%d",&num);

                      search0(head,num);

                        break;

                   case 1: printf("请输入你想查找的学生的数学成绩\n");

                      scanf("%d",&math);

                      search1(head,math);

                       break;   

                    case 2: printf("请输入你想查找的学生的体育成绩\n");

                      scanf("%d",&pe);

                      search2(head,pe);

                      break; 

                   }break;   

             case 2:

                     printf("请输入你想修改的学生的学号\n");

                           scanf("%d",&num);

                           modification(head,num);break;

             case 3:print(head);break; 

             case 4:average(head);

                  sort(head);break;

             case 5:save(head); out(head);return;

         }

  }                         

}

void password()

 {

 int a;

  int  i;

   printf("############################################\n");

   printf("+++++++++欢迎进入成绩分析系统+++++++++++++++\n");

   printf("############################################\n");

   printf("+++++++++++++请输入用户名+++++++++++++++++++\n");

   printf("********************************************\n");

   printf("用户名:[                    ]\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");

    scanf("%d",&a);

  if(a==123)

   teacher();

  if(a==1234)

  student(); 

}

int main()

{ 

password();

return 0;   

}