本系统解决了账号重复注册问题，注册不同权限账号问题。为各位码友更好地使用本代码，特地使用了返回值判断是否登录成功，用结构体保存登录成功的信息，这样更好的兼容了其他系统嵌入本系统代码。
1.返回值判断是否登录成功
2.借用结构体保存登录成功的信息
3.根据账号赋予用户的不同权限，比如，管理员，用户，本系统是我用来写选课系统的，所以里面的用户是学生和老师，管理员。
4.将注册的信息保存到文本以便下次使用。
5.还有一个注销功能，密码正确后就可以注销账号了。
#include#include #include #include #include #include //整体链表保持代表头 typedef struct account_number_x{// char name[30]; int account_number;//账号 int password;//密码 account_number_x *next; }account_number_X; typedef struct tyre_information{//学生 char curriculum[30];//课程 char Teacher[30];//任课老师名字 char class_x[30];//班级 int quantity;//剩余选课数量 tyre_information *next; }informatioN; typedef struct name1{ char name[30];//名字 int account_number;//账号 int password;//密码 name1 *next; }Name; void student_x(informatioN*pt,Name*pi); void str_x(informatioN*pt,Name*pi); void my_curriculum(informatioN*pt,Name*po); void preservation_(informatioN*pt); int judge_NO_repeat(int account_number1); int judge_z_m(int account_number,int password){//判断账号密码是否正确 (正确管理员返回2)(学生返回1)(错误返回0) system("cls"); FILE *pi=fopen("学生.txt","r"); int n=0; char ch[30]; int account_number1=0,password1=0; if(pi!=NULL){ while(n==0){ fscanf(pi,"%s%d%d",&ch,&account_number1,&password1); if(account_number==account_number1&&password==password1){ fclose(pi); return 1;//密码正确 } n=feof(pi); }fclose(pi); } FILE *pu=fopen("管理.txt","r"); if(pu!=NULL){ n=0; while(n==0){ fscanf(pi,"%s%d%d",&ch,&account_number1,&password1); if(account_number==account_number1&&password==password1){ fclose(pu); return 2;//密码正确 //管理员() } n=feof(pu); }fclose(pu); } FILE *pd=fopen("老师.txt","r"); if(pd!=NULL){ n=0; while(n==0){ fscanf(pi,"%s%d%d",&ch,&account_number1,&password1); if(account_number==account_number1&&password==password1){ fclose(pd); return 3;//密码正确 //管理员() } n=feof(pd); }fclose(pd); } } void temporary_x(int n,account_number_X*pt){//临时储存 account_number_X *pi=pt; while(pi->next!=NULL){ pi=pi->next; } switch(n){ case 1:{//普通学生 FILE *pu=fopen("学生.txt","r"); if(pu!=NULL){ int x=0; fscanf(pu,"%d",&x); x=feof(pu); if(x==0){ fclose(pu); pu=fopen("学生.txt","r"); while(x==0){ pi=pi->next=(account_number_X*)malloc(sizeof(account_number_X)); fscanf(pu,"%s%d%d",&pi->name,&pi->account_number,&pi->password); x=feof(pu); }pi->next=NULL; } } break; } case 2:{//管理员 FILE *pu=fopen("管理.txt","r"); if(pu!=NULL){ int x=0; fscanf(pu,"%d",&x); x=feof(pu); if(x==0){ fclose(pu); pu=fopen("管理.txt","r"); while(x==0){ pi=pi->next=(account_number_X*)malloc(sizeof(account_number_X)); fscanf(pu,"%s%d%d",&pi->name,&pi->account_number,&pi->password); x=feof(pu); }pi->next=NULL; } } break; } case 3:{ FILE *pu=fopen("老师.txt","r"); if(pu!=NULL){ int x=0; fscanf(pu,"%d",&x); x=feof(pu); if(x==0){ fclose(pu); pu=fopen("老师.txt","r"); while(x==0){ pi=pi->next=(account_number_X*)malloc(sizeof(account_number_X)); fscanf(pu,"%s%d%d",&pi->name,&pi->account_number,&pi->password); x=feof(pu); }pi->next=NULL; } } break; } } } void delete_ss(account_number_X*pt,int account_number){//删除节点(根据账号删除) account_number_X *pi=pt; int x=0; while(pi!=NULL){ if(pi->next->account_number==account_number){ pi->next=pi->next->next; break; } pi=pi->next; } } void Read_in_z_x(account_number_X*pt,int n){//(1删除普通学生)(2删除管理) switch(n){ case 1:{ FILE *ua=fopen("学生.txt","w"); account_number_X *pi=pt->next; while(pi!=NULL){ fprintf(ua," %s %d %d ",pi->name,pi->account_number,pi->password); pi=pi->next; }fclose(ua); break; } case 2:{ FILE *ua=fopen("管理.txt","w"); account_number_X *pi=pt->next; while(pi!=NULL){ fprintf(ua," %s %d %d ",pi->name,pi->account_number,pi->password); pi=pi->next; }fclose(ua); break; } case 3:{ FILE *ua=fopen("老师.txt","w"); account_number_X *pi=pt->next; while(pi!=NULL){ fprintf(ua," %s %d %d ",pi->name,pi->account_number,pi->password); pi=pi->next; }fclose(ua); break; } } } void cancellation(){//注销账号 system("cls"); int account_number=0;//账号 int password=0;//密码 int y=0; printf("%50c输入要注销的账号:",' '); scanf("%d",&account_number); printf("%50c输入要注销的密码:",' '); scanf("%d",&password); int n=0; n=judge_z_m(account_number,password); if(n==1){//如果是普通学生 account_number_X *px=(account_number_X*)malloc(sizeof(account_number_X)); px->next=NULL; temporary_x(1,px); //然后删除节点//再读入文件 delete_ss(px,account_number); //最后读入文件 Read_in_z_x(px,1); y++; printf("注销成功!n"); system("pause"); } if(n==2){//管理员注销 account_number_X *px=(account_number_X*)malloc(sizeof(account_number_X)); px->next=NULL; temporary_x(2,px); //然后删除节点//再读入文件 delete_ss(px,account_number); //最后读入文件 Read_in_z_x(px,2); printf("注销成功!n"); y++; system("pause"); }if(y==3){//注销老师的账号 account_number_X *px=(account_number_X*)malloc(sizeof(account_number_X)); px->next=NULL; temporary_x(3,px); //然后删除节点//再读入文件 delete_ss(px,account_number); //最后读入文件 Read_in_z_x(px,3); printf("注销成功!n"); y++; system("pause"); } if(y==0){ printf("注销失败没有该账号!n"); system("pause"); } } void administrators_x(){//管理员注册 system("cls"); int account_number=0,account_number1=0;//账号 int password=0,password1=0,invitation=0;//密码 char name[30]; printf("请输入账号:"); scanf("%d",&account_number); printf("请输入密码:"); scanf("%d",&password); printf("输入姓名:"); scanf("%s",&name); printf("请输入邀请码:"); scanf("%d",&invitation); if(invitation==12345){ int y=0; y=judge_NO_repeat(account_number);//判断账号是否相同 if(y==0){ FILE *pu=fopen("管理.txt","a"); if(pu!=NULL){ fprintf(pu," %s %d %d ",name,account_number,password); fclose(pu); }else{ fclose(pu); pu=fopen("管理.txt","w"); fprintf(pu," %s %d %d ",name,account_number,password); fclose(pu); } }else{ printf("账号重复请换一个吧!n"); system("pause"); return; } printf("注册成功! n"); system("pause"); }else{ printf("抱歉邀请码错误哦!n"); system("pause"); } } void user_x(){//学生注册 int account_number=0,account_number1=0;//账号 int password=0,password1=0;//密码 char name[30]; printf("请输入账号:"); scanf("%d",&account_number); printf("请输入密码:"); scanf("%d",&password); printf("请输入姓名:"); scanf("%s",&name); int y=0; y=judge_NO_repeat(account_number);//判断账号是否相同 if(y==0){ FILE *pu=fopen("学生.txt","a"); if(pu!=NULL){ fprintf(pu," %s %d %d",name,account_number,password); fclose(pu); }else{ fclose(pu); pu=fopen("学生.txt","w"); fprintf(pu," %s %d %d",name,account_number,password); fclose(pu); } }else{ printf("账号重复请换一个吧!n"); system("pause"); return; } printf("注册成功! n"); system("pause"); } void teacher_x(){//老师注册 system("cls"); int account_number=0,account_number1=0;//账号 int password=0,password1=0,invitation=0;//密码 char name[30]; printf("请输入账号:"); scanf("%d",&account_number); printf("请输入密码:"); scanf("%d",&password); printf("请输入姓名:"); scanf("%s",&name); printf("请输入管理码:"); scanf("%d",&invitation); if(invitation==12345){ int y=0; y=judge_NO_repeat(account_number);//判断账号是否相同 if(y==0){ FILE *pu=fopen("老师.txt","a"); if(pu!=NULL){ fprintf(pu," %s %d %d",name,account_number,password); fclose(pu); }else{ fclose(pu); pu=fopen("老师.txt","w"); fprintf(pu," %s %d %d",name,account_number,password); fclose(pu); } }else{ printf("账号重复请换一个吧!n"); system("pause"); return; } printf("注册成功! n"); system("pause"); }else{ printf("抱歉邀请码错误哦!n"); system("pause"); } } int judge_NO_repeat(int account_number1){//判断文件中是否有重复的账号//没有返回0//有返回1 //传账号过来 FILE *pi=fopen("学生.txt","r"); int account_number=0,password=0;//账号密码 int ch[30]; if(pi!=NULL){ int n=0; while(n==0){ fscanf(pi,"%s%d%d",&ch,&account_number,&password); if(account_number1==account_number){ fclose(pi); return 1; } n=feof(pi); } } FILE *pu=fopen("管理.txt","r"); if(pu!=NULL){ int n=0; while(n==0){ fscanf(pu,"%s%d%d",&ch,&account_number,&password); if(account_number1==account_number){ fclose(pu); return 1; } n=feof(pu); } } return 0; } void register_s_s(){//注册 //注册时注意判断是否有账号重复 system("cls"); printf("%30c------------------------------------------n",' '); printf("%30c| 龙哥登录系统 |n",' '); printf("%30c| |n",' '); printf("%30c| [1]学生注册 [2]管理员注册 |n",' '); printf("%30c| [3]老师注册 [4]exit |n",' '); printf("%30c| |n",' '); printf("%30c------------------------------------------n",' '); int n=0; scanf("%d",&n); switch(n){ case 1:{ user_x(); break; } case 2:{ administrators_x(); break; } case 3:{ teacher_x(); break; } case 4:{ return; break; } } } int Sign_in_x(Name*pt){//登录成功返回1理员返回2//学生返回1//密码错误返回0 system("cls"); FILE *pi=fopen("学生.txt","r"); int account_number=0,account_number1=0;//账号 int n=0; int password=0,password1=0;//密码 printf("%50c输入账号:",' '); scanf("%d",&account_number); printf("%50c输入密码:",' '); scanf("%d",&password); char ch[30]; if(pi!=NULL){ while(n==0){ fscanf(pi,"%s%d%d",&ch,&account_number1,&password1); if(account_number==account_number1&&password==password1){ fclose(pi); pt->account_number=account_number; pt->password=password; strcpy(pt->name,ch); return 1;//密码正确 } n=feof(pi); }fclose(pi); } FILE *pu=fopen("管理.txt","r"); if(pu!=NULL){ n=0; while(n==0){ fscanf(pi,"%s%d%d",&ch,&account_number1,&password1); if(account_number==account_number1&&password==password1){ fclose(pu); pt->account_number=account_number; pt->password=password; strcpy(pt->name,ch); return 2;//密码正确 //管理员() } n=feof(pu); }fclose(pu); } FILE *pd=fopen("老师.txt","r"); if(pd!=NULL){ n=0; while(n==0){ fscanf(pd,"%s%d%d",&ch,&account_number1,&password1); if(account_number==account_number1&&password==password1){ fclose(pd); pt->account_number=account_number; pt->password=password; strcpy(pt->name,ch); return 3;//密码正确 //管理员() } n=feof(pd); }fclose(pd); } } int Login_interface(Name*pt){//登录界面/管理员返回2//学生返回1//密码错误返回0 printf("%50c欢迎使用......",' '); Sleep(300); while(1){ system("cls"); printf("%30c----------------------------------------------n",' '); printf("%30c| 龙哥登录系统 |n",' '); printf("%30c| |n",' '); printf("%30c| [1]登录 [2]注销账号 [3]注册 [4]exit |n",' '); printf("%30c| |n",' '); printf("%30c----------------------------------------------n",' '); int n=0; printf("%30c选择功能选项:",' '); scanf("%d",&n); switch(n){ case 1:{ int p=0; p=Sign_in_x(pt); if(p==1){//普通学生 system("cls"); printf("%50c欢迎学生登录!",' '); system("pause"); return 1; }else{//否则 if(p==2){//管理员 system("cls"); printf("%50c欢迎管理登录!n",' '); system("pause"); return 2; } if(p==3){ system("cls"); printf("%50c欢迎老师登录!n",' '); system("pause"); return 3; } } printf("账号密码错误!n"); system("pause"); break; } case 2:{ cancellation(); break; } case 3:{ register_s_s(); break; } case 4:{ return 0; break; } } } } int main(void){ Name *pt=(Name*)malloc(sizeof(Name)); pt->next=NULL; Login_interface(pt); }
