mjd.c

对于C 学生信息管理系统

   printf("|学号\t|姓名\t|语文\t|英语\t|数学\t|\n");
  
   p1=head;
     while(number!=p1->number&&p1->next!=NULL)

  {p2=p1;p1=p1->next;} 
         if(number==p1->number)  
    {printf("|%d\t|%s\t|%.1f\t|%.1f\t|%.1f\t|\n",p1->number,p1->name,p1->yuwen,p1->yingyu,p1->shuxue);
        }
         else 
           printf("%d不存在此学生!\n",number);
  
         printf("输入要查询的学生的学号,");
         scanf("%d",&number);
}
printf("已经退出了!\n");
return(head);}



void print2311(score *head)

{
 score *p;
 if(head==NULL)      
         {printf("\n没有任何学生资料!\n");}
 else
 {printf("%d\n",n);
 printf("|学号\t|姓名\t|语文\t|英语\t|数学\t|\n");
 p=head;
     do
    {printf("|%d\t|%s\t|%.1f\t|%.1f\t|%.1f\t|\n",p->number,p->name,p->yuwen,p->yingyu,p->shuxue);
       
       p=p->next;}while (p!=NULL);
 }
}

 score *statistics2311(score *head)
 
 {
  float sum1=0,sum2=0,sum3=0,ave1=0,ave2=0,ave3=0,max=0,min;
  score *p;
  int x,y=0,i=0;

       p=head;
       printf("1个人总分和平均分\t2单科平均分\t3总分最高分\t4总分最低分\n");
         scanf("%d",&x);
      getchar();

 switch(x)

 {
 case 1: if(head==NULL)
     {printf("\n没有任何学生资料!\n");return(head);}
       else
  {
     
        printf("|学号\t|姓名\t|语文\t|英语\t|数学\t|总分\t|平均分\t|\n");
    
     while(p!=NULL)
     {
      sum1=p->yuwen+p->yingyu+p->shuxue;                            
               ave1=sum1/3;
          
               printf("|%d\t|%s\t|%.1f\t|%.1f\t|%.1f\t|%.1f\t|%.1f\t|\n",p->number,p->name,p->yuwen,p->yingyu,p->shuxue,sum1,ave1);
     
              
         p=p->next;}
    }

return(head);    break;
  case 2: if(head==NULL)
            {printf("\n没有任何学生资料!\n");return(head);}
       while(p!=NULL)
         { 
    sum1=sum1+p->yuwen;
    sum2=sum2+p->yingyu;
    sum3=sum3+p->shuxue;
    y=y+1;
                ave1=sum1/y;
                ave2=sum2/y;
                ave3=sum3/y;
    p=p->next;
          }
     printf("语文平均分是%.1f\n",ave1);
     printf("英语平均分是%.1f\n",ave2);
     printf("数学平均分是%.1f\n",ave3);
             return(head); break;
  case 3: 
   if(head==NULL)
            {printf("\n没有任何学生资料!\n");return(head);}
       max=p->yuwen+p->yingyu+p->shuxue;
   while(i<n)
  {   
    i=i+1;
    sum1=p->yuwen+p->yingyu+p->shuxue;  
        if(max<sum1)
  max=sum1;
  p=p->next;
  }
    
   printf("总分最高分:%.1f",max);
   printf("\n");
   return(head); break;

  case 4: if(head==NULL)
     {printf("\n没有任何学生资料!\n");return(head);}
      while(p!=NULL)
   {
       min=p->yuwen+p->yingyu+p->shuxue;
    while(p!=NULL)
    {sum2=p->yuwen+p->yingyu+p->shuxue; 
   
    if(min>sum2)
     min=sum2;
     p=p->next;
    }
   }
  
      printf("总分最低分:%.1f",min);
      printf("\n");
      return(head); break;
 
  default :printf("输入错误,请重试!\n");
 }
 return(head);
 
 }

save2311(score *p1) 

{ 
 FILE *fp;
 
 char filepn[20];
 
 printf("请输入文件路径及文件名:");
 scanf("%s",filepn);
 if((fp=fopen(filepn,"w+"))==NULL)
 {
  printf("不能打开文件!\n");
  return 0;
 }
    fprintf(fp,"            班级考试成绩管理系统             \n");
    
 fprintf(fp,"|学号\t|姓名\t|语文\t|英语\t|数学\t|\n");
 while(p1!=NULL)
 {
 fprintf(fp,"%d\t%s\t%.1f\t%.1f\t%.1f\t\n",p1->number,p1->name,p1->yuwen,p1->yingyu,p1->shuxue);
  p1=p1->next;
 
 }
 fclose(fp);
 printf("文件已经保存!\n");
 return 0;
}
 score *taxis2311(score *head)    

{ score *p,*max;
  int   i,j,x;
  float fen;
  char t[10];
  if(head==NULL)
  {printf("\n没有任何学生资料，请先建立链表!\n");return(head);}
  max=p=head;
  
 
    printf("1按学生学号排序\t2按学生姓名排序\t3按语文成绩排序\n");
    printf("4按英语成绩排序\t5按数学成绩排序\t\n");
  
     printf("请选择操作:");
    scanf("%d",&x);
    getchar();

  switch(x) 
  {case 1 :  
               for(i=1;i<n;i++)
               {
             for(j=i+1;j<=n;j++)
                 {
       max=p;
       p=p->next;
      
       if(max->number>p->number)
        {
        k=max->number;
        max->number=p->number;
        p->number=k;       
        strcpy(t,max->name);
        strcpy(max->name,p->name);
        strcpy(p->name,t);  
        fen=max->yuwen;
        max->yuwen=p->yuwen;
        p->yuwen=fen;      
        fen=max->yingyu;
        max->yingyu=p->yingyu;
        p->yingyu=fen;      
        fen=max->shuxue;
        max->shuxue=p->shuxue;
        p->shuxue=fen;
            
        }

                 }
    max=head;p=head;
             }
                print2311(head);break;

   case 2 :   for(i=1;i<n;i++)
                {
    for(j=i+1;j<=n;j++)
                 {
     max=p;
        p=p->next;
      if(strcmp(max->name,p->name)>0)
        {
       strcpy(t,max->name);
       strcpy(max->name,p->name);
       strcpy(p->name,t);
   
       k=max->number;
       max->number=p->number;
       p->number=k;
   fen=max->yuwen;
       max->yuwen=p->yuwen;
       p->yuwen=fen;
       fen=max->yingyu;
       max->yingyu=p->yingyu;
       p->yingyu=fen;
       fen=max->shuxue;
       max->shuxue=p->shuxue;
       p->shuxue=fen;

        }
                 }
                  p=head;
            max=head;
                }
                print2311(head);
    break;

   case 3 :     for(i=1;i<n;i++)
                {for(j=i+1;j<=n;j++)
                 {max=p;
      p=p->next;
      if(max->yuwen>p->yuwen)
        {
       fen=max->yuwen;
          max->yuwen=p->yuwen;
          p->yuwen=fen;                   
       k=max->number;
      max->number=p->number;
      p->number=k; 
                     strcpy(t,max->name);
      strcpy(max->name,p->name);
      strcpy(p->name,t);

          fen=max->yingyu;
       max->yingyu=p->yingyu;
       p->yingyu=fen;


       fen=max->shuxue;
       max->shuxue=p->shuxue;
       p->shuxue=fen;

        }
                 }
                  p=head;
            max=head;
                }
                print2311(head);
    break;

   case 4 :      for(i=1;i<n;i++)
                {for(j=i+1;j<=n;j++)
                 {max=p;
      p=p->next;
      if(max->yingyu>p->yingyu)
        {
      fen=max->yingyu;
         max->yingyu=p->yingyu;
         p->yingyu=fen;  
      k=max->number;
      max->number=p->number;
      p->number=k;
         strcpy(t,max->name);
      strcpy(max->name,p->name);
      strcpy(p->name,t);
         fen=max->yuwen;
      max->yuwen=p->yuwen;
      p->yuwen=fen;

         fen=max->shuxue;
      max->shuxue=p->shuxue;
      p->shuxue=fen;

        }
                 }
                  p=head;
            max=head;
                }
               print2311(head);
    break;

   case 5 :      for(i=1;i<n;i++)
                {for(j=i+1;j<=n;j++)
                 {max=p;
      p=p->next;
      if(max->shuxue>p->shuxue)
        {
      fen=max->shuxue;
         max->shuxue=p->shuxue;
         p->shuxue=fen; 
      k=max->number;
      max->number=p->number;
      p->number=k; 
         strcpy(t,max->name);
      strcpy(max->name,p->name);
      strcpy(p->name,t); 
         fen=max->yuwen;
      max->yuwen=p->yuwen;
      p->yuwen=fen;
         fen=max->yingyu;
      max->yingyu=p->yingyu;
      p->yingyu=fen;
 
        }
     }
                  p=head;
            max=head;
                }
                print2311(head);
    break; 
   default :printf("输入错误,请重试! \n");
  }
     return (0);}

 
int menu2311(k)
{
 int i;
 printf("\t\t\t\t班级考试成绩管理系统\n");
printf("1输入学生的资料\t\t\t2从文件调入资料\t\t\t3查询学生的成绩\n");
printf("4追加学生的资料\t\t\t5显示学生的成绩\t\t\t6统计学生的成绩\n"); 
printf("7保存输入的资料\t\t\t8对成绩进行排序\n");
printf("欢迎进入成绩管理系统，请选择您所要的操作(选择(0)退出):");
scanf("%d",&k);
   getchar();
return (k);}
main() 
{score *head=0,*stu=0;

while(1)
{k=menu2311(k);
switch(k)
{case 1: head=creat2311();break;
 case 2: head=load2311(head);break;
 case 3: head=search2311(head);break; 
 case 4: head=add2311(head,stu);break;
 case 5: print2311(head); break;
 case 6: statistics2311(head); break;
 case 7: save2311(head);break;
 case 8: taxis2311(head);break; 
 case 0: exit(0);
 default: printf("输入错误,请重试!\n"); }
}
}