基于文件的學生管理系統
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作者：小汀 2004-7-1 6:32:20 已被閱讀217次    編輯 | 刪除 | 保存本文到我的公文包
本程序用的是菜單操作。已在tc上調試通過大家用是要在相同目錄下加一個student.txt文件，里面的第一行加一個#號就可以使用了！ 
以下是程序的基本情況 
學生基本情況： 
（學號，姓名，獎學金，英語成績，數學成績，計算機成績，平均成績） 

功能模塊： 
  1.添加一個學生基本情況的輸入并保存到文件中 
  2.刪除一個學生基本情況并保存 
  3.統計每個學生的平均成績，并排序輸出 
  4.更改一個學生的某一項或多項信息并保存 

相關的代碼如下： 

#include <stdio.h> 
#include <stdlib.h> 
typedef struct node 
{ 
  int num; 
  char name[9]; 
  int money; 
  int english; 
  int math; 
  int computer; 
  int average; 
  struct node *next; 
}student_info; 

/*該程序的界面*/ 
char menu() 
{ 
  char menu[]={"    Students' Information Management(v1.0)  \n\r" 
                "                                            \n\r" 
                "******************************************  \n\r" 
                "|                                        |  \n\r" 
                "|    1.Show the students' information    |  \n\r" 
                "|    2.Add a new student's information  |  \n\r" 
                "|    3.Delet a student's information(num)|  \n\r" 
                "|    4.Show the average marks of student |  \n\r" 
                "|    5.Update a student's information    |  \n\r" 
                "|    6.Save the students'information    |  \n\r" 
                "|    7.Quit the system                  |  \n\r" 
                "|                                        |  \n\r" 
                "******************************************  \n\r" 
                "PLEASE ENTER THE NUMBER(1--7):\n" 
              }; 
  char ch; 
  clrscr(); 
  puts(menu); 
  ch=getch(); 
  if(ch!='1'&&ch!='2'&&ch!='3'&&ch!='4'&&ch!='5'&&ch!='6'&&ch!='7') 
      return '0'; 
  else 
      return ch; 
} 

/*學生的基本情況顯示出來*/ 
void showInfo(student_info *p) 
{ 
  student_info *stu; 
  stu=p->next; 
  if(stu==NULL) 
  { 
      printf("The List is empty!..."); 
      return; 
  } 
  while(stu) 
  { 
      printf("**********\n"); 
      printf("Num:%d\nName:%s\nMoney:%d\nEnglish:%d\nMath:%d\nComputer:%d\nAverage:%d\n",stu->num,stu->name,stu->money,stu->english,stu->math,stu->computer,stu->average); 
      printf("**********\n"); 
      stu=stu->next; 
  } 
} 


/*添加一個學生的情況*/ 
void addInfo(student_info *p) 
{ 
    student_info *stu,*t; 
    stu=(student_info *)malloc(sizeof(student_info)); 
    /*數據錄入*/ 
    printf("Please enter the information of the student:"); 
    printf("\nStudent--num:");scanf("%d",&stu->num); 
    printf("\nStudent--name:");scanf("%s",stu->name); 
    printf("\nStudent--money:");scanf("%d",&stu->money); 
    printf("\nStudent--english:");scanf("%d",&stu->english); 
    printf("\nStudent--math:");scanf("%d",&stu->math); 
    printf("\nStudent--computer:");scanf("%d",&stu->computer); 
    stu->average=(stu->english+stu->math+stu->computer)/3; 
    t=p->next; 
    if(t==NULL) 
      { 
        p->next=stu; 
        stu->next=NULL; 
      } 
    else 
      { 
        p->next=stu; 
        stu->next=t; 
      } 
} 

/*刪除一個學生的資料(按學號)*/ 
void deleInfo(student_info *p) 
{ 
    student_info * stu,*t; 
    int i,mark=0; 
    char ch; 
    t=p; 
    stu=t->next; 
    if(stu==NULL) 
      { 
        printf("The List is empty!..."); 
        return; 
      } 
    printf("Please enter the num of the student:\n"); 
    scanf("%d",&i); 
    while(stu) 
    { 
      if(stu->num==i) 
        { 
            printf("Really delet it?(Y or N):\n"); 
            ch=getch(); 
            if(ch=='Y'||ch=='y') 
            { 
              printf("Wait......\n"); 
              t->next=stu->next; 
              free(stu); 
              mark=1; 
              printf("Success delet the student's information!"); 
            } 
            else 
              return; 
        } 
      else 
        { 
            t=t->next; 
            stu=stu->next; 
        } 
    } 
    if(mark==0) 
      printf("The student of this num is not exit!"); 

} 
/*更新一個學生的基本資料*/ 
void update(student_info *p) 
{ 
    student_info *stu; 
    char ch; 
    stu=p; 
    clrscr(); 
    printf("What item do you want to update:\n"); 
    printf("1.num||2.name||3.money||4.english||5.math||6.computer(1--6)\n(End with 0)\n"); 
    start: ch=getch(); 
    { 
      switch(ch) 
      { 
        case '0': 
              { 
                stu->average=(stu->english+stu->math+stu->computer)/3; 
                return; 
              } 
        case '1': 
              { 
                printf("Please enter the new num:\n"); 
                scanf("%d",&stu->num); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
        case '2': 
              { 
                printf("Please enter the new name:\n"); 
                scanf("%s",stu->name); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
        case '3': 
              { 
                printf("Please enter the new money:\n"); 
                scanf("%d",&stu->money); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
        case '4': 
              { 
                printf("Please enter the new english:\n"); 
                scanf("%d",&stu->english); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
        case '5': 
              { 
                printf("Please enter the new math:\n"); 
                scanf("%d",&stu->math); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
        case '6': 
              { 
                printf("Please enter the new computer:\n"); 
                scanf("%d",&stu->computer); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
        default: 
              { 
                printf("Your input is error!"); 
                printf("What item do you want to update:\n"); 
                goto start; 
              } 
      } 
    } 
} 
void updateInfo(student_info *p) 
{ 
    student_info * stu,*t; 
    int i,mark=0; 
    t=p; 
    stu=t->next; 
    if(stu==NULL) 
      { 
        printf("The List is empty!..."); 
        return; 
      } 
    printf("Please enter the num of the student:\n"); 
    scanf("%d",&i); 
    while(stu) 
    { 
      if(stu->num==i) 
        { 
            update(stu); 
            mark=1; 
            return; 
        } 
      else 
        { 
            t=t->next; 
            stu=stu->next; 
        } 
    } 
    if(mark==0) 
      printf("The student of this num is not exit!"); 

} 

/*排序并顯示學生的平均成績*/ 

void sortInfo(student_info *p) 
{ 
    int i=1; 
    student_info *stu,*t1,*t2; 
    stu=p; 
    if(stu->next==NULL) 
    { 
      printf("There is no student's information!"); 
      return; 
    } 
    t1=stu->next; 
    t2=t1->next; 
    while(t1) 
    { 
      while(t2) 
      { 
        if(t1->average<t2->average) 
        { 
            stu->next=t2; 
            t1->next=t2->next; 
            t2->next=t1; 
        } 
        t2=t2->next; 
      } 
      t1=t1->next; 
      stu=stu->next; 
    } 
    stu=p->next; 
    while(stu) 
    { 
      printf("The NO.%d is:\nNum:%d\nName:%s\nAverage:%d\n",i,stu->num,stu->name,stu->average); 
      printf("--------"); 
      stu=stu->next; 
      i++; 
    } 
} 
/*保存整個鏈表信息到文件中*/ 
void saveInfo(student_info *p) 
{ 
  student_info *stu; 
  FILE *fp; 
  stu=p->next; 
  if(stu==NULL) 
  { 
      printf("The List is empty!"); 
      return; 
  } 
  fp=fopen("student.txt","wt"); 
  if(fp==NULL) 
  { 
      printf("The file open error!"); 
      return; 
  } 
  if(stu==NULL) 
  { 
      printf("The list is empty!"); 
      fputc('#',fp); 
      fclose(fp); 
      return; 
  } 
  printf("Wait......\n"); 
  while(stu) 
  { 
      fputc('*',fp); 
      fprintf(fp,"%d\n%s\n%d\n%d\n%d\n%d\n%d\n",stu->num,stu->name,stu->money,stu->english,stu->math,stu->computer,stu->average); 
      stu=stu->next; 
  } 
  fputc('#',fp); 
  fclose(fp); 
  printf("Success to save the file!\n"); 
} 


/*釋放整個鏈表*/ 
void freeInfo(student_info *p) 
{ 
  student_info *stu,*t; 
  stu=p->next; 
  while(stu) 
  { 
      t=stu; 
      stu=stu->next; 
      free(t); 
  } 
  free(p); 
} 

/*函數從文件中調數據上來*/ 
void show_file(student_info *stu) 
{ 
  FILE *fp; 
  student_info *p,*q; 
  char ch; 
  int i=0; 
  q=stu; 
  fp=fopen("student.txt","rt"); 
  if(fp==NULL) 
  { 
      printf("File error!\npress any key to exit!..."); 
      getch(); 
      exit(1); 
  } 
  ch=fgetc(fp); 
  while(ch!='#') 
  { 
      p=(student_info *)malloc(sizeof(student_info)); 
      fscanf(fp,"%d\n%s\n%d\n%d\n%d\n%d\n%d\n",&p->num,p->name,&p->money,&p->english,&p->math,&p->computer,&p->average); 
      q->next=p; 
      i++; 
      q=p; 
      p++; 
      ch=fgetc(fp); 
  } 
  if(i==0) 
  { 
      printf("The file is empty!\npress any key to continue..."); 
      getch(); 
      return; 
  } 
  else 
  { 
      q->next=NULL; 
      printf("There is %d students' information!\npress any key...",i); 
      getch(); 
      return; 
    } 
} 

/*退出整個系統*/ 
char exitSys() 
{ 
  char ch; 
  
 
程序允許你三次輸入口令
把此程序加在你的程序的合適位置即可達到要輸入口令才行運行程序的目的#include "stdio.h"
#include "string.h"
main()
{int i;
char s[]="QQ962041";\\this is the password
char pwd[9];
printf("please input the password\n");
gets(pwd);
for(i=0;i<2;i++)
if(strcmp(pwd,s)==0)
printf("password OK",i=3);\\就加在這里
else {printf("password error.please input the password again:\n");
gets(pwd);}