c语言学生管理系统

1、c语言学生管理系统 同学信息的录入,查找,删除,修改等操作 #includestdio.h #includestdlib.h#includestring.htypedef struct pnode /结构体定义 用于存放同学信息的节点char name 20; /姓名char xh20; /学号char fh30; /房号personnode;char filename20; /文件名file *fp; /指向文件的指针void creat() /创建新数据文件的函数 创建一个二进制文件 用于存放同学数据personnode *person;person=(personnode *)mallo

2、c(sizeof(personnode); /为节点安排内存printf(n please enter the filename:n);scanf(%s,filename);if(fp=fopen(filename,w+)=null)printf(n you have no enter the filename,can not font the file);exit(0);printf(n please enter the name,studentnumbeer (the same length) and roomnumber,spare with space,endwith #n);scan

3、f(%s,person-name);while(strcmp(person-name,#) /该循环用于掌握 同学信息的录入 当输入#时 同学信息录入完毕scanf(%s %s,person-xh,person-fh);fprintf(fp,%-10s%-20s%-50sn,person-name,person-xh,person-fh);scanf(%s,person-name);fclose(fp);void readfile() /文件读取函数 用于打开已有的二进制数据文件printf(n please enter the fileroad:n);scanf(%s,filename);

4、/此处输入为文件的路径 如c：zhangif(fp=fopen(filename,r+)=null)printf(n can't open thefile:n);exit(0);fclose(fp);void output() /输出函数 用于输出文件的全部信息personnode *person;long offset1,offset2;char name18,name28,name38;char xh116,xh216,xh316;char fh130,fh230,fh330;person=(personnode *)malloc(sizeof(personnode);if(fp=

5、fopen(filename,r)=null)printf(n can't open the file);exit(0);while(!feof(fp) /此循环用于 对文件数据中关键字学号进行从小到大冒泡排序int a,b,c,d; /a为循环结束判定变量 b，c，d用于起泡排序时学号交换的替换if(fp=fopen(filename,r+)=null)printf(n can't open the file);exit(0);while(!feof(fp) / 从文件头开头遍历while(!feof(fp) /对两组数据进行排序offset1=ftell(fp); /猎取文

6、件内部当前指针位置fscanf(fp,%s%s%sn,person-name,person-xh,person-fh);strcpy(name1,person-name);strcpy (xh1,person-xh);strcpy(fh1,person-fh);if(feof(fp) break; /文件结束 跳出循环offset2=ftell(fp); /猎取文件内部下一指针位置 同学信息的录入,查找,删除,修改等操作 fscanf(fp,%s%s%sn,person-name,person-xh,person-fh); strcpy (name2,person-name);strcpy(x

7、h2,person-xh);strcpy(fh2,person-fh);b=strlen(xh1);c=strlen(xh2);d=strcmp(xh1,xh2);if(b=cd0) /假如 学号1大于等于学号2 怎交换全部数据strcpy(name3,name1);strcpy(name1,name2);strcpy(name2,name3);strcpy(xh3,xh1);strcpy(xh1,xh2);strcpy(xh2,xh3);strcpy(fh3,fh1);strcpy(fh1,fh2);strcpy(fh2,fh3);fseek(fp,offset1,seek_set); /将

8、文件指针移动offset1个字节strcpy(person-name,name1);strcpy(person-xh,xh1);strcpy(person-fh,fh1);fprintf(fp,%-10s%-20s%-50sn,person-name,person-xh,person-fh);/排序后写入文件strcpy(person-name,name2);strcpy(person-xh,xh2);strcpy( person-fh,fh2);fprintf(fp,%-10s%-20s%-50sn,person-name,person-xh,person-fh);/排序后写入文件fseek

9、(fp,offset2,seek_set); /将文件位置指针从文件头向前移动offset2个字节rewind(fp); /指向头文件while(!feof(fp) /此循环用于推断学号是否有序offset1=ftell(fp);fscanf(fp,%s%s%sn,person-name,person-xh,person-fh);strcpy (xh1,person-xh);if(feof(fp) a=1; break;offset2=ftell(fp);fscanf(fp,%s%s%sn,person-name,person-xh,person-fh);strcpy(xh2,person-x

10、h);b=strlen(xh1);c=strlen(xh2);d=strcmp(xh1,xh2);if(b=cd=0) a=1; /若a为1 则有序else a=0; /a为0怎无序break;fseek(fp,offset2,seek_set);if(a) break; /a为1 说明学号已经有序 跳出循环rewind(fp);if(a) break; /若a为1，则学号已有序排列，跳出总循环，输出文件rewind(fp);printf(n*n);printf(%35sn,thefile(thefile hava printf as studentnumber);printf(%-10s%-

11、20s%-50sn,name,studentnumber,roomnumber);while(!feof(fp) /次循环用于输出文件fscanf(fp,%s%s%sn,person-name,person-xh,person-fh);printf(%-10s%-20s%-50sn,person-name,person-xh,person-fh);fclose(fp);printf(*nn);void search1() / 按姓名搜寻函数int k=0;char namekey8; 同学信息的录入,查找,删除,修改等操作 personnode *person; person=(personn

12、ode *)malloc(sizeof(personnode);printf(n please enter the namehead you need :);scanf(%s,namekey);if(fp=fopen(filename,rb)=null)printf(n can't open thefile);exit(0);while(!feof(fp)fscanf(fp,%s %s %sn,person-name,person-xh,person-fh);if(!strcmp(namekey,person-name) /比较是否相同 相同则输出结果 否则输出未找到记录printf(

13、nn have serched,the courrent is:);printf(%-10s%-20s%-50sn,person-name,person-xh,person-fh);k=1;if(!k) printf(nn sorry,there is not the current of thiss people n);fclose(fp);void search2() /按学号搜寻函数int k=0;char xhkey16;personnode *person;person=(personnode *)malloc(sizeof(personnode);printf(n please e

14、nter the roomnumber you want to serch：);scanf(%s,xhkey);if(fp=fopen(filename,rb)=null)printf(n can't open the file );exit(0);while(!feof(fp)fscanf(fp,%s %s %sn,person-name,person-xh,person-fh);if(!strcmp(xhkey,person-xh) /比较是否相同 相同则输出结果 否则输出未找到记录printf(nn have got it,the current is：);printf(%-10

15、s%-20s%-50sn,person-name,person-xh,person-fh);k=1;if(!k) printf(nn sorry,there is not the current of thiss people n);fclose(fp);void search3() /按房号搜寻函数int k=0;char fhkey30;personnode *person;person=(personnode *)malloc(sizeof(personnode);printf(n please enter the roomnumber you want to serch:);scanf

16、(%s,fhkey);if(fp=fopen(filename,rb)=null)printf(n can't open thefile);exit(0);while(!feof(fp)fscanf(fp,%s %s %sn,person-name,person-xh,person-fh);if(!strcmp(fhkey,person-fh) /比较是否相同 相同则输出结果 否则输出未找到记录printf(nn have got it,the current is:);printf(%-10s%-20s%-50sn,person-name,person-xh,person-fh);k

17、=1;if(!k) printf(nn sorry,there is not the current of thiss peoplen);fclose(fp);void append() /插入函数 用于像已有文件插入一条新的同学信息记录personnode *person;person=(personnode *)malloc(sizeof(personnode);if(fp=fopen(filename,a)=null)printf(n can't open the file);exit(0);printf(n please enter the name,studentnumber

18、 and roomnumber n);scanf(%s %s %s,person-name,person-xh,person-fh);fprintf(fp,%-10s%-20s%-50sn,person-name,person-xh,person-fh);fclose(fp);void modify() /更新函数 用 同学信息的录入,查找,删除,修改等操作 于修改指定同学姓名的记录 int k=0;long offset;char namekey8;personnode *person;person=(personnode *)malloc(sizeof(personnode);printf

19、(n please enter the studentname you want to updata :);scanf(%s,namekey);if(fp=fopen(filename,r+)=null)printf(n can't open thefile);exit(0);while(!feof(fp)offset=ftell(fp);fscanf(fp,%s %s %sn,person-name,person-xh,person-fh);if(!strcmp(namekey,person-name) /比较是否相同 如k=1;break;if(k) /相同 输出记录并进行修改pr

20、intf(n hava got it,the current is：);printf(%-10s%-20s%-50sn,person-name,person-xh,person-fh);printf(n please enter the new studentname,studentnumber and roomnumber ：);scanf(%s %s %s,person-name,person-xh,person-fh);fseek(fp,offset,seek_set);fprintf(fp,%-10s%-20s%-50sn,person-name,person-xh,person-fh

21、);else printf(n sorry，there is not the current of this people n);fclose(fp);void deleted() /删除函数 用于删除指定同学姓名的记录int k=0;char m;long offset;char namekey8;personnode *person;person=(personnode *)malloc(sizeof(personnode);printf(n please enter the name you want to delete ：);scanf(%s,namekey);if(fp=fopen(

22、filename,r+)=null)printf(n can't open the file );exit(0);while(!feof(fp) /此循环遍历整个文件 查找需要删除的记录offset=ftell(fp);fscanf(fp,%s%s%sn,person-name,person-xh,person-fh);if(!strcmp(namekey,person-name)k=1;break;if(k)printf(n hava got it,the current is：);printf(%-10s%-20s%-50sn,person-name,person-xh,person-fh);printf(n are you sure to delete it?y/n?);scanf(%s,m);if(m='y') /删除确认按钮fseek(fp,offset,seek_set); /删除记录fprintf(fp,%-10s%-20s%-50sn,);else rewind(fp);else pr