學生成績管理系統

 
/*頭文件*/
#include <stdio.h>
#include<dos.h>
#include<stdlib.h>   /*其它說明*/
#include<string.h>   /*字符串函數*/
#include<mem.h>      /*內存操作函數*/
#include<ctype.h>    /*字符操作函數*/
#include<alloc.h>    /*動態地址分配函數*/
#define LEN sizeof(STUDENT)
typedef struct stu   /*定義結構體數組用于緩存數據*/
{char num[6];
 char name[5];
 int score[3];
 int sum;
 float average;
 int order;
 struct stu *next;
}STUDENT;

/*函數原型*/
STUDENT  *init();    /*初始化函數*/
int menu_select();   /*菜單函數*/
STUDENT *create();   /*創建鏈表*/
void print(STUDENT *head);   /* 顯示全部記錄*/
void search(STUDENT *head);    /*查找記錄*/
STUDENT *delete(STUDENT *head);   /*刪除記錄*/
STUDENT *sort(STUDENT *head);    /*排序*/
STUDENT *insert(STUDENT *head,STUDENT *new);   /*插入記錄*/
void save(STUDENT *head);     /*保存文件*/
STUDENT *load();        /*讀文件*/

/*主函數界面*/
main()
{STUDENT *head,new;
 head=init();       /*鏈表初始化,使head的值為NULL*/
 for(;;)            /*循環無限次*/
   {switch(menu_select())    
      {                     
     case 1:head=create();break;
     case 2:print(head);break;
     case 3:search(head);break;
     case 4:head=delete(head);break;
     case 5:head=sort(head);break;
     case 6:head=insert(head,&new);break;  /*&new表示返回地址*/
     case 7:save(head);break;
     case 8:head=load(); break;
     case 9:exit(0);       /*如菜單返回值為9則程序結束*/
      }
   }
}

/*初始化函數*/
STUDENT *init()
{
 return NULL;  /*返回空指針*/
}

/*菜單選擇函數*/
menu_select()
{int n;
 struct date d;     /*定義時間結構體*/
 getdate(&d);      /*讀取系統日期并把它放到結構體d中*/
 printf("press any key to enter the menu......");   /*按任一鍵進入主菜單*/
 getch();    /*從鍵盤讀取一個字符,但不顯示于屏幕*/
 clrscr();   /*清屏*/
 printf("********************************************************************************\n");
 printf("\t\t                Welcome to\n");
 printf("\n\t\t      The student score manage system\n");
 printf("*************************************MENU***************************************\n");
 printf("\t\t\t1. Enter the record\n");            /*輸入學生成績記錄*/
 printf("\t\t\t2. Print the record\n");            /*顯示*/
 printf("\t\t\t3. Search record on name\n");       /*尋找*/
 printf("\t\t\t4. Delete a record\n");             /*刪除*/
 printf("\t\t\t5. Sort to make new a file\n");     /*排序*/
 printf("\t\t\t6. Insert record to list\n");       /*插入*/
 printf("\t\t\t7. Save the file\n");               /*保存*/
 printf("\t\t\t8. Load the file\n");               /*讀取*/
 printf("\t\t\t9. Quit\n");                       /*退出*/
 printf("\n\t\t             Made by Hu Haihong.\n");
 printf("********************************************************************************\n");
 printf("\t\t\t\t%d\\%d\\%d\n",d.da_year,d.da_mon,d.da_day);   /*顯示當前系統日期*/
 do{
    printf("\n\t\t\tEnter your choice(1~9):");  
    scanf("%d",&n);
   }while(n<1||n>9);    /*如果選擇項不在1~9之間則重輸*/
   return(n);           /*返回選擇項，主函數根據該數調用相應的函數*/
}

/*輸入函數*/
STUDENT *create()
{int i,s;
 STUDENT *head=NULL,*p;  /* 定義函數.此函數帶回一個指向鏈表頭的指針*/
 clrscr();
 for(;;)
   {p=(STUDENT *)malloc(LEN);  /*開辟一個新的單元*/
    if(!p)   /*如果指針p為空*/
      {printf("\nOut of memory.");   /*輸出內存溢出*/
       return (head);  /*返回頭指針,下同*/
      }
    printf("Enter the num(0:list end):"); 
    scanf("%s",p->num);
    if(p->num[0]=='0') break;    /*如果學號首字符為0則結束輸入*/
    printf("Enter the name:");
    scanf("%s",p->name);
    printf("Please enter the %d scores\n",3);  /*提示開始輸入成績*/
    s=0;                /*計算每個學生的總分，初值為0*/
    for(i=0;i<3;i++)    /*3門課程循環3次*/
      {
       do{
      printf("score%d:",i+1);
      scanf("%d",&p->score[i]);
      if(p->score[i]<0 || p->score[i]>100)   /*確保成績在0~100之間*/
      printf("Data error,please enter again.\n");
     }while(p->score[i]<0 || p->score[i]>100);
     s=s+p->score[i];   /*累加各門成績*/
      }
      p->sum=s;     /*將總分保存*/
      p->average=(float)s/3;  /*先用強制類型轉換將s轉換成float型,再求平均值*/
      p->order=0;             /*未排序前此值為0*/
      p->next=head;           /*將頭結點做為新輸入結點的后繼結點*/
      head=p;                 /*新輸入結點為新的頭結點*/
   }
   return(head);  
}

/* 顯示全部記錄函數*/
void print(STUDENT *head)
{int i=0;     /* 統計記錄條數*/
 STUDENT *p;  /*移動指針*/
 clrscr();
 p=head;      /*初值為頭指針*/
 printf("\n************************************STUDENT************************************\n");
 printf("-------------------------------------------------------------------------------\n");
 printf("| Rec |   Num   |   Name   |  Sc1  |  Sc2  |  Sc3  |  Sum  |   Ave   | Order |\n");
 printf("-------------------------------------------------------------------------------\n");
 while(p!=NULL)
   {
    i++;
    printf("| %3d |  %4s   |   %-4s   |  %3d  |  %3d  |  %3d  |  %3d  |  %4.2f  |  %-5d|\n", 
    i, p->num,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order);
    p=p->next;
   }
 printf("-------------------------------------------------------------------------------\n");
 printf("**************************************END**************************************\n");
}

/*查找記錄函數*/
void search(STUDENT *head)
{STUDENT *p;    /*  移動指針*/
 char s[5];     /*存放姓名用的字符數組*/
 clrscr();
 printf("Please enter name for searching.\n");
 scanf("%s",s);
 p=head;    /*將頭指針賦給p*/
 while(strcmp(p->name,s) && p != NULL)  /*當記錄的姓名不是要找的，或指針不為空時*/
   p=p->next;     /*移動指針，指向下一結點*/
   if(p!=NULL)         /*如果指針不為空*/
   {printf("\n*************************************FOUND************************************\n");
    printf("-------------------------------------------------------------------------------\n");
    printf("|     Num    |    Name    |  sc1  |  sc2  |  sc3  |  Sum  |   Ave   | Order |\n");
    printf("-------------------------------------------------------------------------------\n");
    printf("|     %4s   |    %4s    |  %3d  |  %3d  |  %3d  |  %3d  |  %4.2f  |  %-5d|\n",
    p->num,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order);
    printf("-------------------------------------------------------------------------------\n");
    printf("***************************************END**************************************\n");
    }
   else
     printf("\nThere is no num %s student on the list.\n",s);   /*顯示沒有該學生*/
}

/*刪除記錄函數*/
STUDENT *delete(STUDENT *head)
{int n;
 STUDENT *p1,*p2;  /*p1為查找到要刪除的結點指針，p2為其前驅指針*/
 char c,s[6];     /*s[6]用來存放學號,c用來輸入字母*/
 clrscr();
 printf("Please enter the deleted num: ");
 scanf("%s",s);
 p1=p2=head;    /*給p1和p2賦初值頭指針*/
 while(strcmp(p1->num,s) && p1 != NULL)   /*當記錄的學號不是要找的，或指針不為空時*/
   {p2=p1;            /*將p1指針值賦給p2作為p1的前驅指針*/
    p1=p1->next;      /*將p1指針指向下一條記錄*/
   }
 if(strcmp(p1->num,s)==0)  /*學號找到了*/
   {printf("**************************************FOUND************************************\n");
    printf("-------------------------------------------------------------------------------\n");
    printf("|     Num    |    Name    |  sc1  |  sc2  |  sc3  |  Sum  |   Ave   | Order |\n");
    printf("-------------------------------------------------------------------------------\n");
    printf("|     %4s   |    %4s    |  %3d  |  %3d  |  %3d  |  %3d  |  %4.2f  |  %-5d|\n",
    p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->sum,p1->average,p1->order);
    printf("-------------------------------------------------------------------------------\n");
    printf("***************************************END**************************************\n");
    printf("Are you sure to delete the student Y/N ?"); /*提示是否要刪除,輸入Y刪除,N則退出*/
    for(;;)
      {scanf("%c",&c);
       if(c=='n'||c=='N') break;  /*如果不刪除,則跳出本循環*/
       if(c=='y'||c=='Y')
         {
          if(p1==head)       /*若p1==head，說明被刪結點是首結點*/
          head=p1->next;     /*把第二個結點地址賦予head*/
        else
          p2->next=p1->next;  /*否則將一下結點地址賦給前一結點地址*/
          n=n-1;
          printf("\nNum %s student have been deleted.\n",s);
          printf("Don't forget to save.\n");break;  /*刪除后就跳出循環*/
         }
      }
    }
  else
    printf("\nThere is no num %s student on the list.\n",s);  /*找不到該結點*/
 return(head);
}

/*排序函數*/
STUDENT *sort(STUDENT *head)
{int i=0;                       /*保存名次*/