ke.c

学员信息管理系统: 1：输入数据2：数据的删除3：数据的增加4：数据的修改5：数据存盘6：从盘读取数据并向屏幕输出

#include<stdio.h>
#include<malloc.h>
#define LEN sizeof(struct student)
struct student
{char num[15];
 char name[10];
 char tel[30];
 char birth[30];
 char sushe[30];
 char address[30];
 int m;
 int math;
 int English;
 int physics;
 struct student *next;
 };
 int n;  /*定义全局变量n*/


 struct student *creat(void)   /*建立学生数据的单向动态链表*/
 {
 int i;
 int length,flag=1;
 struct student *head;
 struct student *p,*pt;
 n=0;
  while(flag==1)
 {
 printf("BEGIN!--How many students do you want to input?(Input the amount):_"); /*输入你想输入学生数据的学生数量*/
 scanf("%d",&length);
 if(length!=0) flag=0;
 }
 for(i=0;i<length;i++)
    {p=(struct student * )malloc(LEN);/*开辟一个新单元*/
    if(i==0) head=pt=p;
    else pt->next=p;
    pt=p;
    printf("Plese input the basic info and his(her) grade of the studen_%d\n",i+1);
    p->m=i+1;
    printf("This is a serial number for using!__( %d )\n",p->m); /*为各学生定一编号*/
    printf(" No.");
    scanf("%s",p->num);
    printf(" NAME:");
    scanf("%s",p->name);
    printf(" tel:");
    scanf("%s",p->tel);
    printf(" birth:");
    scanf("%s",p->birth);
    printf("sushe:");
    scanf("%s",p->sushe);
    printf("address:");
    scanf("%s",p->address);
    printf("His(Her) grade:\n");
    printf(" MATH:");
    scanf("%d",&p->math);    /*要求输入的为学生的数学,英语,物理三科的分数*/
    printf(" English:");
    scanf("%d",&p->English);
    printf(" PHYSICS:");
    scanf("%d",&p->physics);
    }
 n=n+i;
 p->next=NULL;
 return(head);
 }


 void print(struct student *head)   /*输出链表函数,将各数据元素值输出*/
 {struct student *p1;
 printf("\nNOW!These %d studends'infor and his(her) grade you have inputed are:\n",n);
 p1=head;
 printf("\n(SER NUM)    NO.      NAME   tel  birth    sushe  address  score:MATH   ENGLISH   PHYSICS\n");
 if(head!=NULL)
 do
 {printf("(%d)%12s%8s%8s%8s%8s%9s%13d%8d%10d\n",p1->m,p1->num,p1->name,p1->tel,p1->birth,p1->sushe,p1->address,p1->math,p1->English,p1->physics);

 p1=p1->next;
 }while(p1!=NULL);
 }


 struct student * del(struct student *head,int num)  /*删除结点函数,即将你想要删除的一组数据删除*/
 {struct student *p1,*p2;
 if(head==NULL)
    {printf("\nlist null!\n");
    goto end;
    }
 p1=head;
 while(num!=p1->m&&p1->next!=NULL) /*p1指向的不是所要找的结点,并且后面还有结点*/
    {p2=p1;p1=p1->next;}    /*p1后移一个结点*/
 if(num==p1->m)
    {if(p1==head) head=p1->next; /*找到结点*/
    else p2->next=p1->next;   /*否则将下一结点地址赋给前一结点地址*/
    printf("dele:%d\n",num);
    n=n-1;
    }
 else printf("%d not been found! \n",num);
 end:;
 return(head);
 }



 struct student * insert(struct student *head,struct student *stud)/*插入结点函数,插入一组新数据*/
 {struct student *p0,*p1,*p2;
 p1=head;                       /*使p1指向第一个结点*/
 p0=stud;                       /*p0指向要插入的结点*/
 if(head==NULL)                 /*原来的链表为空表*/
    {head=p0;p0->next=NULL;}    /*使p0指向的结点作为头结点*/
 else
    {while((p0->m>p1->m)&&(p1->next!=NULL))
        {p2=p1;                     /*使p2指向刚才指向的结点*/
         p1=p1->next;}               /*p1后移一个结点*/
    if(p0->m<=p1->m)
        {if(head==p1) head=p0;      /*插到原来第一个结点之前*/
         else p2->next=p0;           /*插到p2指向的结点之后*/
         p0->next=p1;}
    else
    {p1->next=p0;p0->next=NULL;}/*插到最后的结点之后*/
    }
 n=n+1;                      /*结点数加1*/
 return(head);
 }



 struct student *change(struct student *head,long num) /*修改各数据元素的值的函数*/
 {struct student *p1,*pk;
 char b[10],c[5],d[30],e[30],f[30];
 int M,E,P;
 p1=head;
 printf("\ninput the new infor\n");
 printf(" NAME:");
 scanf("%s",b);
 printf(" tel:");
 scanf("%s",c);
 printf(" birth:");
 scanf("%s",d);
 printf(" sushe:");
 scanf("%s",e);
 printf(" address:");
 scanf("%s",f);
 printf("His(Her) grade:\n");
 printf(" MATH:");
 scanf("%d",&M);
 printf(" English:");
 scanf("%d",&E);
 printf(" PHYSICS:");
 scanf("%d",&P);
 while(num!=p1->m&&p1->next!=NULL)
    {p1=p1->next;}
 if(num==p1->m)    /*找到要修改的结点*/
    {strcpy(p1->name,b); /*将新值复制到要修改的结点的对应的元素上*/
    strcpy(p1->tel,c);
    p1->math=M;
    p1->English=E;
    p1->physics=P;
    }
    return(head);
 }

 void save(struct student *head)  /*存盘函数,将数据存入磁盘中*/
 {FILE *fp;
  struct student *p1;
  p1=head;
  if((fp=fopen("stu.rec","wb"))==NULL)
    {printf("cannot open file\n");
    return;
    }
  if(head!=NULL)
  do
  {if(fwrite(p1,sizeof(struct student),1,fp)!=1)
    printf("file write error!\n");
    p1=p1->next;}while(p1!=NULL);
    fclose(fp);
  }


  void pr(struct student *head)  /*读盘数据并输出函数*/
  {FILE *fp;
  struct student *p1;
  p1=head;
  printf("The nether datas are that you have inputed:\n");
  printf("\n(SER NUM)      NO.      NAME   tel  birth  sushe  address  score:MATH   ENGLISH   PHYSICS\n");
  printf("-------------------------------------------------------------------------------\n");
  printf("-------------------------------------------------------------------------------\n");
  fp=fopen("stu.rec","rb");
  if(head!=NULL)
  do
    {fread(p1,sizeof(struct student),1,fp);
     printf("   (%d)%12s%8s%6s%8s%8s%9s%13d%8d%10d\n",p1->m,p1->num,p1->name,p1->tel,p1->birth,p1->sushe,p1->address,p1->math,p1->English,p1->physics);

     p1=p1->next;}while(p1!=NULL);
  }


 void main()          /*主函数*/
 {struct student *head,stu;
 int c,j,k,t;
 int del_num;
 int change_num;
 printf("                 ******************************\n");  /*显示制作者自定义该程序的名字*/
 printf("                 *                            *\n");
 printf("                 * welcome to keweibin's play *\n");
 printf("                 *                            *\n");
 printf("                 ******************************\n");
 printf("          PROGRAM BEGIN!!\n");
 RE:printf("FIRST:(1).INPUT THE NEWS DATAS   (2).CHOOSE THE FUNCTION\n"); /*程序开始,1选择为输入新的数据,2选择为选择该程序的功能*/
    printf("      ~~~~~~~~~~~~~~~~~~~~~~~~   ~~~~~~~~~~~~~~~~~~~~~~~\n");
    printf("<<CHOOSE(1)or(2)>>");
 scanf("%d",&t);
 if(t==1)
 { head=creat();
 printf("Whether save these datas?(1.yes 2.no) ");
 scanf("%d",&k);if(k==1) save(head);printf("\n  *SAVE SUCCEED!*\n");}
 else if(t==2)goto PT;
 else {printf("    Error!!\n");
 goto RE;} /*若输入的非1或2,则跳回重新选择*/
 PT: printf("* chose the function *\n");
  printf("======================================================================\n");/*制作者自设计的功能排列表*/
  printf(" (1).show the students'infor        (2).delete one student's infor\n");
  printf(" (3).insert another students'infor  (4).change one students'infor \n");
  printf(" (5).lookup and output the datas you have inputed \n");
  printf(" (6).Input the new infor again!     (7).END                       \n");
  printf("======================================================================\n");
  printf(" {PROMPT!!:If there is not some datas appearing on the screen,not to choose(1)(2)(3)(4)(5).}\n");/*该句为向用户提示:如果屏幕没有显示数据,则不要选择1至5项*/
  loop:printf("Plese choose(1--7): ");
  scanf("%d",&c);/*输入用户选择项的编号*/
  switch(c)
  {
   case 1: print(head);                /*执行显示函数*/
           printf("Whether save these datas?(1.yes 2.no)_"); /*以下三句为向用户询问是否保存该数据*/
           scanf("%d",&k);if(k==1) {save(head); printf("\n  *SAVE SUCCEED!*\n"); }
           printf("Whether continue choose the function?(1.yes 2.no)_");/*向用户询问是否继续使用功能选择*/
           scanf("%d",&j);if(j==1) goto loop;else exit(0);break;
   case 2: printf("\ndelete(choose the serial number)_:" );    /*执行删除函数*/
           scanf("%d",&del_num);
           head=del(head,del_num);
           print(head);
           printf("Whether save these datas?(1.yes 2.no)_");
           scanf("%d",&k);if(k==1) {save(head); printf("\n  *SAVE SUCCEED!*\n"); }
           printf("Whether continue choose the function(1.yes 2.no)_");
           scanf("%d",&j);if(j==1)goto loop;else exit(0);
           break;
   case 3: printf("\ninput the inserted record:\n");    /*执行插入函数*/
           printf("you must give him(her) a serial number:__");/*用户必须向新输入的学生定一个编号,方便记忆使用*/
           scanf("%d",&stu.m);
           printf("No.:");
           scanf("%s",stu.num);
           printf("name:");
           scanf("%s",stu.name);
           printf("tel:");
           scanf("%s",stu.tel);
           printf("birth:");
           scanf("%s",stu.birth);
           printf("His(Her) grade:\n");
           printf("MATH:");
           scanf("%d",&stu.math);
           printf("ENGLISH:");
           scanf("%d",&stu.English);
           printf("PHYSICS:");
           scanf("%d",&stu.physics);
           head=insert(head,&stu);
           print(head);
           printf("Whether save these datas?(1.yes 2.no)_");
           scanf("%d",&k);if(k==1) {save(head); printf("\n  *SAVE SUCCEED!*\n"); }
           printf("Whether continue choose the function(1.yes 2.no)_");
           scanf("%d",&j);if(j==1)goto loop;else exit(0);
           break;
   case 4: printf("\ninput the  serial number you want to change the infor of its:"); /*执行修改函数*/
           scanf("%d",&change_num);
           head=change(head,change_num);
           print(head);
           printf("Whether save these datas?(1.yes 2.no)_");
           scanf("%d",&k);if(k==1) {save(head); printf("\n  *SAVE SUCCEED!*]\n"); }
           printf("Whether continue choose the function(1.yes 2.no)_");
           scanf("%d",&j);if(j==1)goto loop;else exit(0);
           break;

   case 5: pr(head);/*执行从盘读出数据并向屏幕输出函数*/
           printf("Whether save these datas?(1.yes 2.no)_");
           scanf("%d",&k);if(k==1) {save(head); printf("\n  *SAVE SUCCEED!*\n"); }
           printf("Whether continue choose the function(1.yes 2.no)_");
           scanf("%d",&j);if(j==1)goto loop;else exit(0);
           break;
   case 6: head=creat(); /*执行输入新数据函数*/
           printf("Whether save these datas?(1.yes 2.no)_");
           scanf("%d",&k);if(k==1) {save(head); printf("\n  *SAVE SUCCEED!*\n"); }
           printf("Whether continue choose the function?(1.yes 2.no)_");
           scanf("%d",&j);if(j==1) goto loop;else exit(0);break;
   case 7: exit(0); /*终止程序*/
     }
    getch();
  }