My freshman work, suitable for beginners, uses the construction of an optimized login system to consolidate the C language foundation. Specifically, there are three login systems ranging from simple to slightly complex:
The first version
①The login system of the first version is very simple. It can only be logged in and registered during the current run, and it needs to be re-registered to log in when it runs again, and it cannot realize the function of hiding the password.
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct zhanghu//用户信息储存
{
char name[20];
char zhanghao[20];
char mima[20];
};
int zhuce(struct zhanghu zh[],int m);//注册模块
void denglu(struct zhanghu zh[],int m);//登录模块
void menu(void);//菜单
void again(struct zhanghu zh[], char l[]);//检测模块
int main(void)//主程序
{
int m=0;
int k;
struct zhanghu zh[100];
while (1)
{
menu();
printf("请选择服务：");
scanf("%d",&k);
switch (k)
{
case 1:
zhuce(zh, m);
m++;
printf("%d\n\n",m);
break;
case 2:
denglu(zh, m);
break;
case 3:
printf("谢谢使用!!!\n");
exit(0);
default:
printf("不存在该服务！！！");
break;
}
}
return 0;
}
void menu(void)//菜单
{
printf("---------------------------------------\n");
printf(" 1 --- 创建新账户\n");
printf(" 2 --- 登录\n");
printf(" 3 --- 退出系统\n");
printf("---------------------------------------\n");
}
int zhuce(struct zhanghu zh[],int m)//注册模块
{
char d[20], e[20],l[20];
printf("用户名：");
scanf("%s",&l);
again(zh,l);
printf("账号：");
scanf("%s",&d);
printf("\n");
printf("密码");
scanf("%s",&e);
printf("\n");
strcpy(zh[m].name, l);
strcpy(zh[m].zhanghao,d);
strcpy(zh[m].mima, e);
printf("创建成功！\n");
printf("%s\n%s\n", zh[m].mima, zh[m].zhanghao);
m++;
return m;
}
void denglu(struct zhanghu zh[], int m)//登录模块
{
int g, f, i;
char d[20], e[20],n[20];
printf("用户名：");
scanf("%s",&n);
printf("账号：");
scanf("%s", &d);
printf("\n");
printf("密码");
scanf("%s", &e);
printf("\n");
for (i = 0; i < 99; i++)
{
if (strcmp(zh[i].name, n) == 0)
{
g = strcmp(zh[i].zhanghao, d);
f = strcmp(zh[i].mima, e);
if ((g == 0) && (f == 0) )
{
printf("%s,欢迎回来！！！\n\n", zh[i].name);
}
else
{
printf("账号或密码错误！！！！\n\n");
}
}
}
}
void again(struct zhanghu zh[], char l[])//检测模块
{
int i;
char z[20];
strcpy(z, l);
for (i = 0; i < 99; i++)
{
while (strcmp(zh[i].name, z) == 0)
{
printf("该用户名已被注册！！！\n");
i = 0;
printf("用户名：");
scanf("%s", &z);
}
}
strcpy(l, z);
}second version
②The login system of the second version stores the user information in the TXT file, and needs to add the Users.txt file in the directory, which realizes the hiding of the password, but there are defects.
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <time.h>
typedef struct users//创建用户数据存储单元
{
char name[20];
char zh[20];
char mm[20];
}A;
void menu();//菜单
void start(int math);//中转程序
void zhuce();//注册模块
void denglu();//登录模块
int now = 1;
int i;
int main()//主程序
{
menu();
return 0;
}
void menu()//菜单
{
int select=0;
printf("\n\t\t\t++++++++++++++++++++++++\n\t\t\t+ 欢迎使用XX登录系统 +\n\t\t\t++++++++++++++++++++++++\n");
system("color 1F"); //程序面板颜色
while (now)
{
system("cls");
do
{
printf("\n ******************菜单栏*****************\n");
printf("\t\t*\t ①登录 *\n");
printf("\t\t*\t ②注册 *\n");
printf("\t\t*\t ③退出系统\t\t*\n");
printf(" *****************************************\n");
printf("\n");
printf("\t\t请输入选项：[\t]\b\b\b");
scanf("%d", &select);
} while (select > 5 ||select < 1);
start(select);
}
}
void start(int math)//中转
{
switch (math)
{
case 1:
denglu();
break;
case 2:
zhuce();
break;
case 3:
printf("感谢您的支持！\n欢迎下次使用！");
now = 0;
exit(0);
}
}
void zhuce()//注册模块
{
system("cls");
char c[20];
A a, b;
FILE* fp;
printf("\n\t\t欢迎来到注册界面！\n");
Sleep(500);
fp = fopen("Users.txt","r");
fread(&b, sizeof(A), 1, fp);
printf("\n\t\t请设置账号:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
scanf("%s",&a.zh);
while(1)
{
if (strcmp(a.zh, b.zh))
{
if (!feof(fp))
{
fread(&b, sizeof(A), 1, fp);
}
else
{
break;
}
}
else
{
printf("该账号已存在！！！");
Sleep(1000);
fclose(fp);
return;
}
}
int time = 2;
do
{
printf("\t\t请设置密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
a.mm[i] = _getch();
if (a.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
a.mm[i] = '\0';
printf("\n");
printf("\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
if (!strcmp( a.mm,c) )
{
printf("\t\t请输入用户名：");
scanf("%s",&a.name);
fp = fopen("Users.txt", "a");
fwrite(&a,sizeof(A),1,fp);
printf("%s,注册成功！！！", a.name);
fclose(fp);
Sleep(1500);
return;
}
else
{
if (time != 0)
{
printf("密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！");
fclose(fp);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
void denglu()
{
system("cls");
A a,b;
FILE* fp;
printf("欢迎来到登录界面！");
printf("账号：\n");
scanf("%s",&b.zh);
printf("密码：\n");
i = 0;
for (i = 0; i < 20; i++)
{
b.mm[i] = _getch();
if (b.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
b.mm[i] = '\0';
printf("\n");
fp = fopen("Users.txt", "r");
while (1)
{
fread(&a, sizeof(A), 1, fp);
//printf("%s %s %s\n",a.name,a.zh,a.mm);
if (strcmp(b.zh,a.zh)==0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("账号或密码错误！！！\n");
fclose(fp);
Sleep(1000);
system("cls");
return;
}
}
}
if (strcmp(b.mm, a.mm)==0)
{
printf("%s，欢迎回来！！！\n",a.name);
fclose(fp);
Sleep(1000);
system("cls");
return;
}
else
{
printf("密码错误！！！\n");
fclose(fp);
Sleep(1000);
system("cls");
return;
}
}
third version
③The login system of the third version includes the login and registration function, the password recovery function, and the administrator system to view and modify user information. Similarly, the function of hiding passwords can be realized, but there are defects. (Two files, Users.dat and guanliyuan.dat, need to be created in the directory)
Library file
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <time.h>storage unit creation
typedef struct users//创建用户数据存储单元
{
char name[20];//用户名
char zh[20];//账号
char mm[20];//密码
char question[20];//问题（找回密码时使用）
char answer[20];//回答（找回密码时使用）
}A;
typedef struct guanliyuan//设置管理员账号
{
char glzh[20];//账号
char glmm[20];//密码
}guanliyuan;create function
int jiancha();//检测是否注册管理员账号
void chuangjianguanliyuan();//在使用前先创建管理员账号
void menu();//菜单
void guanlimenu();//管理员菜单
void start(int math);//中转模块
void guanlistart(int math);//管理系统中转模块
void zhuce();//注册模块
void denglu();//登录模块
void gaimi();//改密模块
void zhaohui();//找回模块
void guanli();//管理模块
void look();//查看模块
void change();//修改用户模块
void xiugai();//修改管理员账户模块
main program
int now = 1;//循环时使用
int i;//函数中的通用整型变量
int main()//主程序
{
int canshu;
canshu = jiancha();
if (canshu==1)
{
chuangjianguanliyuan();
}
menu();
return 0;
}When using it for the first time, register an administrator account
int jiancha()//检测是否注册管理员账号
{
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat","rb+");
char first;
first = fgetc(fp);
if (first==-1)
{
return 1;
}
else
{
return 0;
}
}
void chuangjianguanliyuan()//在使用前先创建管理员账号
{
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat", "rb+");
char a[20], b[20];
printf("\t\t请输入管理员账号：");
scanf("%s", &a);
printf("\n\t\t请输入管理员密码：");
scanf("%s", &b);
strcpy(guanli.glzh, a);
strcpy(guanli.glmm, b);
fwrite(&guanli,sizeof(guanliyuan),1,fp);
fclose(fp);
printf("\n\t\t注册成功！");
Sleep(1000);
return;
}
menu and transfer module
void menu()//菜单
{
int select = 0;
printf("\n\t\t\t++++++++++++++++++++++++\n\t\t\t+ 欢迎使用XX登录系统 +\n\t\t\t++++++++++++++++++++++++\n");
system("color 1F"); //程序面板颜色
while (now)
{
system("cls");//每次循环开始时清屏
do
{
system("cls");
printf("\n ******************菜单栏*****************\n");
printf("\t\t*\t ①登录 *\n");
printf("\t\t*\t ②注册 *\n");
printf("\t\t*\t ③修改密码 *\n");
printf("\t\t*\t ④找回密码 *\n");
printf("\t\t*\t ⑤退出系统 *\n");
printf(" *****************************************\n");
printf("\n");
printf("\t\t请输入选项：[\t]\b\b\b");
scanf("%d", &select);//
} while (20221110>select > 6 || select < 1||select>20221112);
start(select);
}
}
void start(int math)//中转
{
switch (math)
{
case 1:
denglu();
break;
case 2:
zhuce();
break;
case 3:
gaimi();
break;
case 4:
zhaohui();
break;
case 5:
printf("感谢您的支持！\n欢迎下次使用！");
now = 0;
exit(0);
case 20221111:
guanli();
break;
}
}
registration module
void zhuce()//注册模块
{
system("cls");
char c[20];
A a, b;
FILE* fp;
printf("\n\t\t欢迎来到注册界面！\n");
Sleep(500);
fp = fopen("Users.dat", "rb+");
fread(&b, sizeof(A), 1, fp);
printf("\n\t\t请设置账号:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
scanf("%s", &a.zh);
while (1)//检查是否已存在相同账号
{
if (strcmp(a.zh, b.zh))
{
if (!feof(fp))
{
fread(&b, sizeof(A), 1, fp);
}
else
{
break;
}
}
else
{
printf("该账号已存在！！！");
Sleep(1000);
fclose(fp);
return;
}
}
int time = 2;
do
{
printf("\t\t请设置密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)//获取密码
{
a.mm[i] = _getch();
if (a.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
a.mm[i] = '\0';
printf("\n");
printf("\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)//获取密码
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
fclose(fp);
if (!strcmp(a.mm, c))//如果密码正确
{
printf("\t\t请输入用户名：");
scanf("%s", &a.name);
printf("\n\t\t请输入问题（用于找回密码）：");
scanf("%s", &a.question);
printf("\n\t\t请输入答案：");
scanf("%s", &a.answer);
FILE *fw = fopen("Users.dat", "ab+");
fwrite(&a,sizeof(A),1,fw);
printf("\n%s,注册成功！！！\n", a.name);
fclose(fw);
Sleep(1500);
return;
}
else//如果两次都密码不相同
{
if (time != 0)
{
printf("密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！\n", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！\n");
fclose(fp);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
login module
void denglu()//登录模块
{
system("cls");
A a,b;
printf("\n欢迎来到登录界面！\n");
printf("账号：");
scanf("%s", &b.zh);
printf("\n密码：");
i = 0;
for (i = 0; i < 20; i++)//获取密码
{
b.mm[i] = _getch();
if (b.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
b.mm[i] = '\0';
printf("\n");
FILE* fp = fopen("Users.dat", "rb+");//获取用户信息
fread(&a, sizeof(A), 1, fp);
while (1)
{
if (strcmp(b.zh, a.zh)==0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("账号错误！！！\n");
Sleep(1500);
fclose(fp);
return;
}
}
}
fclose(fp);
if (strcmp(b.mm, a.mm)==0 )
{
printf("%s，欢迎回来！！！\n", a.name);
Sleep(1000);
system("cls");
return;
}
else
{
printf("密码错误！！！\n");
Sleep(1000);
system("cls");
return;
}
}
Encryption module
void gaimi()//改密模块
{
system("cls");
A a, b;
printf("欢迎来到改密界面！\n");
printf("请输入账号：");
scanf("%s", &b.zh);
printf("\n请输入密码：");
i = 0;
for (i = 0; i < 20; i++)
{
b.mm[i] = _getch();
if (b.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
b.mm[i] = '\0';
printf("\n");
FILE* pf = fopen("Users.dat", "rb+");
fread(&a, sizeof(A), 1, pf);
while (1)
{
if (strcmp(b.zh, a.zh) == 0)
{
break;
}
else
{
if (!feof(pf))
{
fread(&a, sizeof(A), 1, pf);
}
else
{
printf("账号错误！！！\n");
Sleep(1500);
fclose(pf);
return;
}
}
}
if (strcmp(b.mm, a.mm) == 0)
{
printf("%s,密码正确！！！\n", a.name);
char c[20], d[20];
int time = 2;
do
{
printf("\t\t请设置新密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
printf("\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
d[i] = _getch();
if (d[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
d[i] = '\0';
printf("\n");
if (!strcmp(d, c))
{
strcpy(a.mm,c);
fseek(pf, -((int)(sizeof(A) - 40)), SEEK_CUR);//将文件流调回到要修改的密码的位置
fprintf(pf, "%s", a.mm);//覆盖原来的密码
printf("密码修改成功,请登录!\n");
Sleep(500);
fclose(pf);
Sleep(1500);
return;
}
else
{
if (time != 0)
{
printf("密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！");
fclose(pf);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
else
{
printf("\n密码错误！！！\n");
Sleep(1000);
system("cls");
return;
}
}Retrieve the module (you can change the password after retrieval)
void zhaohui()//找回密码模块
{
system("cls");
A a, b;
printf("欢迎来到登录界面！\n");
printf("账号：");
scanf("%s",b.zh);
printf("\n");
FILE* fp = fopen("Users.dat", "rb+");
fread(&a, sizeof(A), 1, fp);
while (1)
{
if (strcmp(b.zh, a.zh) == 0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("该用户不存在！！！\n");
Sleep(1500);
fclose(fp);
return;
}
}
}
printf("问题：%s\n",a.question);
printf("回答：");
scanf("%s",b.answer);
if (strcmp(b.answer, a.answer) == 0)
{
printf("您的密码：%s\n", a.mm);
printf("\n\n\n\n如要改密请按（1）\n返回请按任意键！！！\n");
char fanhui;
fanhui = _getch();
if (fanhui == '1')
{
char c[20], d[20];
int time = 2;
do
{
printf("\n\t\t请设置新密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
printf("\n\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
d[i] = _getch();
if (d[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
d[i] = '\0';
printf("\n");
if (!strcmp(d, c))
{
strcpy(a.mm, c);
fseek(fp, -((int)(sizeof(A) - 40)), SEEK_CUR);//将文件流调回到要修改的密码的位置
fprintf(fp, "%s", a.mm);//覆盖原来的密码
printf("密码修改成功,请登录!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
}
else
{
if (time != 0)
{
printf("\n密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！");
fclose(fp);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
else
{
Sleep(300);
return;
}
}
}
Admin login module
void guanli()//管理员登录系统
{
system("cls");
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat", "rb+");
fread(&guanli,sizeof(guanliyuan),1,fp);
char c[20], d[20];
printf("\t\t管理员账号：");
scanf("%s",&c);
printf("\n\t\t管理员密码：");
scanf("%s",&d);
if ((0 == strcmp(c, guanli.glzh)) && (strcmp(d, guanli.glmm) == 0))
{
guanlimenu();
return;
}
else
{
printf("\t\t账号或密码错误！！！\n");
Sleep(500);
return;
}
}
void guanlimenu()//管理员菜单
{
int select = 0;
printf("\n\t\t\t++++++++++++++++++++++++\n\t\t\t+ 欢迎使用管理员系统 +\n\t\t\t++++++++++++++++++++++++\n");
system("color 1F"); //程序面板颜色
while (now)
{
system("cls");
do
{
system("cls");
printf("\n ******************菜单栏*****************\n");
printf("\t\t*\t ①查看用户信息 *\n");
printf("\t\t*\t ②修改用户信息 *\n");
printf("\t\t*\t ③修改管理员账户 *\n");
printf("\t\t*\t ④退出系统 *\n");
printf(" *****************************************\n");
printf("\n");
printf("\t\t请输入选项：[\t]\b\b\b");
scanf("%d", &select);
} while (select > 5 || select < 1);
guanlistart(select);
}
}
void guanlistart(int math)//中转
{
switch (math)
{
case 1:
look();
break;
case 2:
change();
break;
case 3:
xiugai();
break;
case 4:
printf("感谢您的支持！\n欢迎下次使用！");
Sleep(500);
menu();
break;
}
}
Administrator function module (view user information, modify user information, modify administrator account)
void change()//修改用户信息
{
system("cls");
A a,b;
int number;
char name[20];
FILE* fp = fopen("Users.dat","rb+");
fread(&a,sizeof(A),1,fp);
printf("请输入要修改账号的用户名：\n");
scanf("%s",&name);
while (1)
{
if (strcmp(a.name, name) == 0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("该用户不存在！！！\n");
fclose(fp);
Sleep(500);
return;
}
}
}
printf("\n%s\n%s\n%s\n",a.name,a.zh,a.mm);
printf("请选择需要修改的项目：用户名（1），账号（2），密码（3）\n");
scanf("%d",&number);
while (1)
{
switch (number)
{
case 1:
printf("新的用户名：");
scanf("%s",b.name);
strcpy(a.name,b.name);
fseek(fp, -((int)(sizeof(A))), SEEK_CUR);
fprintf(fp, "%s", a.name);
printf("用户名修改成功!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
case 2:
printf("新的账号：");
scanf("%s", b.zh);
strcpy(a.zh, b.zh);
fseek(fp, -((int)(sizeof(A) - 20)), SEEK_CUR);
fprintf(fp, "%s", a.zh);
printf("账号修改成功!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
case 3:
printf("新的密码：");
scanf("%s", b.mm);
strcpy(a.mm, b.mm);
fseek(fp, -((int)(sizeof(A) - 40)), SEEK_CUR);
fprintf(fp, "%s", a.mm);
printf("密码修改成功!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
}
}
}
void xiugai()//修改管理员账号
{
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat", "rb+");
char a[20], b[20];
printf("\t\t请输入新账号：");
scanf("%s",&a);
printf("\n\t\t请输入新密码：");
scanf("%s", &b);
strcpy(guanli.glzh, a);
strcpy(guanli.glmm, b);
fseek(fp, -((int)(sizeof(guanliyuan))), SEEK_CUR);
fprintf(fp,"%s",guanli.glzh);
fseek(fp, -((int)(sizeof(guanliyuan))-20), SEEK_CUR);
fprintf(fp, "%s", guanli.glmm);
fclose(fp);
printf("\n\t\t修改成功！");
Sleep(1000);
return;
}full code
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <time.h>
typedef struct users//创建用户数据存储单元
{
char name[20];//用户名
char zh[20];//账号
char mm[20];//密码
char question[20];//问题（找回密码时使用）
char answer[20];//回答（找回密码时使用）
}A;
typedef struct guanliyuan//设置管理员账号
{
char glzh[20];//账号
char glmm[20];//密码
}guanliyuan;
int jiancha();//检测是否注册管理员账号
void chuangjianguanliyuan();//在使用前先创建管理员账号
void menu();//菜单
void guanlimenu();//管理员菜单
void start(int math);//中转模块
void guanlistart(int math);//管理系统中转模块
void zhuce();//注册模块
void denglu();//登录模块
void gaimi();//改密模块
void zhaohui();//找回模块
void guanli();//管理模块
void look();//查看模块
void change();//修改用户模块
void xiugai();//修改管理员账户模块
int now = 1;//循环时使用
int i;//函数中的通用整型变量
int main()//主程序
{
int canshu;
canshu = jiancha();
if (canshu==1)
{
chuangjianguanliyuan();
}
menu();
return 0;
}
int jiancha()//检测是否注册管理员账号
{
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat","rb+");
char first;
first = fgetc(fp);
if (first==-1)
{
return 1;
}
else
{
return 0;
}
}
void chuangjianguanliyuan()//在使用前先创建管理员账号
{
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat", "rb+");
char a[20], b[20];
printf("\t\t请输入管理员账号：");
scanf("%s", &a);
printf("\n\t\t请输入管理员密码：");
scanf("%s", &b);
strcpy(guanli.glzh, a);
strcpy(guanli.glmm, b);
fwrite(&guanli,sizeof(guanliyuan),1,fp);
fclose(fp);
printf("\n\t\t注册成功！");
Sleep(1000);
return;
}
void menu()//菜单
{
int select = 0;
printf("\n\t\t\t++++++++++++++++++++++++\n\t\t\t+ 欢迎使用XX登录系统 +\n\t\t\t++++++++++++++++++++++++\n");
system("color 1F"); //程序面板颜色
while (now)
{
system("cls");//每次循环开始时清屏
do
{
system("cls");
printf("\n ******************菜单栏*****************\n");
printf("\t\t*\t ①登录 *\n");
printf("\t\t*\t ②注册 *\n");
printf("\t\t*\t ③修改密码 *\n");
printf("\t\t*\t ④找回密码 *\n");
printf("\t\t*\t ⑤退出系统 *\n");
printf(" *****************************************\n");
printf("\n");
printf("\t\t请输入选项：[\t]\b\b\b");
scanf("%d", &select);//
} while (20221110>select > 6 || select < 1||select>20221112);
start(select);
}
}
void start(int math)//中转
{
switch (math)
{
case 1:
denglu();
break;
case 2:
zhuce();
break;
case 3:
gaimi();
break;
case 4:
zhaohui();
break;
case 5:
printf("感谢您的支持！\n欢迎下次使用！");
now = 0;
exit(0);
case 20221111:
guanli();
break;
}
}
void zhuce()//注册模块
{
system("cls");
char c[20];
A a, b;
FILE* fp;
printf("\n\t\t欢迎来到注册界面！\n");
Sleep(500);
fp = fopen("Users.dat", "rb+");
fread(&b, sizeof(A), 1, fp);
printf("\n\t\t请设置账号:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
scanf("%s", &a.zh);
while (1)//检查是否已存在相同账号
{
if (strcmp(a.zh, b.zh))
{
if (!feof(fp))
{
fread(&b, sizeof(A), 1, fp);
}
else
{
break;
}
}
else
{
printf("该账号已存在！！！");
Sleep(1000);
fclose(fp);
return;
}
}
int time = 2;
do
{
printf("\t\t请设置密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)//获取密码
{
a.mm[i] = _getch();
if (a.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
a.mm[i] = '\0';
printf("\n");
printf("\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)//获取密码
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
fclose(fp);
if (!strcmp(a.mm, c))//如果密码正确
{
printf("\t\t请输入用户名：");
scanf("%s", &a.name);
printf("\n\t\t请输入问题（用于找回密码）：");
scanf("%s", &a.question);
printf("\n\t\t请输入答案：");
scanf("%s", &a.answer);
FILE *fw = fopen("Users.dat", "ab+");
fwrite(&a,sizeof(A),1,fw);
printf("\n%s,注册成功！！！\n", a.name);
fclose(fw);
Sleep(1500);
return;
}
else//如果两次都密码不相同
{
if (time != 0)
{
printf("密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！\n", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！\n");
fclose(fp);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
void denglu()//登录模块
{
system("cls");
A a,b;
printf("\n欢迎来到登录界面！\n");
printf("账号：");
scanf("%s", &b.zh);
printf("\n密码：");
i = 0;
for (i = 0; i < 20; i++)//获取密码
{
b.mm[i] = _getch();
if (b.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
b.mm[i] = '\0';
printf("\n");
FILE* fp = fopen("Users.dat", "rb+");//获取用户信息
fread(&a, sizeof(A), 1, fp);
while (1)
{
if (strcmp(b.zh, a.zh)==0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("账号错误！！！\n");
Sleep(1500);
fclose(fp);
return;
}
}
}
fclose(fp);
if (strcmp(b.mm, a.mm)==0 )
{
printf("%s，欢迎回来！！！\n", a.name);
Sleep(1000);
system("cls");
return;
}
else
{
printf("密码错误！！！\n");
Sleep(1000);
system("cls");
return;
}
}
void gaimi()//改密模块
{
system("cls");
A a, b;
printf("欢迎来到改密界面！\n");
printf("请输入账号：");
scanf("%s", &b.zh);
printf("\n请输入密码：");
i = 0;
for (i = 0; i < 20; i++)
{
b.mm[i] = _getch();
if (b.mm[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
b.mm[i] = '\0';
printf("\n");
FILE* pf = fopen("Users.dat", "rb+");
fread(&a, sizeof(A), 1, pf);
while (1)
{
if (strcmp(b.zh, a.zh) == 0)
{
break;
}
else
{
if (!feof(pf))
{
fread(&a, sizeof(A), 1, pf);
}
else
{
printf("账号错误！！！\n");
Sleep(1500);
fclose(pf);
return;
}
}
}
if (strcmp(b.mm, a.mm) == 0)
{
printf("%s,密码正确！！！\n", a.name);
char c[20], d[20];
int time = 2;
do
{
printf("\t\t请设置新密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
printf("\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
d[i] = _getch();
if (d[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
d[i] = '\0';
printf("\n");
if (!strcmp(d, c))
{
strcpy(a.mm,c);
fseek(pf, -((int)(sizeof(A) - 40)), SEEK_CUR);//将文件流调回到要修改的密码的位置
fprintf(pf, "%s", a.mm);//覆盖原来的密码
printf("密码修改成功,请登录!\n");
Sleep(500);
fclose(pf);
Sleep(1500);
return;
}
else
{
if (time != 0)
{
printf("密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！");
fclose(pf);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
else
{
printf("\n密码错误！！！\n");
Sleep(1000);
system("cls");
return;
}
}
void zhaohui()//找回密码模块
{
system("cls");
A a, b;
printf("欢迎来到登录界面！\n");
printf("账号：");
scanf("%s",b.zh);
printf("\n");
FILE* fp = fopen("Users.dat", "rb+");
fread(&a, sizeof(A), 1, fp);
while (1)
{
if (strcmp(b.zh, a.zh) == 0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("该用户不存在！！！\n");
Sleep(1500);
fclose(fp);
return;
}
}
}
printf("问题：%s\n",a.question);
printf("回答：");
scanf("%s",b.answer);
if (strcmp(b.answer, a.answer) == 0)
{
printf("您的密码：%s\n", a.mm);
printf("\n\n\n\n如要改密请按（1）\n返回请按任意键！！！\n");
char fanhui;
fanhui = _getch();
if (fanhui == '1')
{
char c[20], d[20];
int time = 2;
do
{
printf("\n\t\t请设置新密码:[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
c[i] = _getch();
if (c[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
c[i] = '\0';
printf("\n");
printf("\n\t\t请确认密码：[ \t\t ]\b\b\b\b\b\b\b\b\b\b\b\b\b");
i = 0;
for (i = 0; i < 20; i++)
{
d[i] = _getch();
if (d[i] == '\r')
{
break;
}
else
{
printf("*");
}
}
d[i] = '\0';
printf("\n");
if (!strcmp(d, c))
{
strcpy(a.mm, c);
fseek(fp, -((int)(sizeof(A) - 40)), SEEK_CUR);//将文件流调回到要修改的密码的位置
fprintf(fp, "%s", a.mm);//覆盖原来的密码
printf("密码修改成功,请登录!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
}
else
{
if (time != 0)
{
printf("\n密码错误！\n\n请重新输入密码！！\n\n您还有%d次机会！！！", time);
time--;
continue;
}
else
{
printf("\n\t\t多次输入错误，即将退出！");
fclose(fp);
Sleep(1500);
return;
}
}
} while (time >= 0);
}
else
{
Sleep(300);
return;
}
}
}
void guanli()//管理员登录系统
{
system("cls");
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat", "rb+");
fread(&guanli,sizeof(guanliyuan),1,fp);
char c[20], d[20];
printf("\t\t管理员账号：");
scanf("%s",&c);
printf("\n\t\t管理员密码：");
scanf("%s",&d);
if ((0 == strcmp(c, guanli.glzh)) && (strcmp(d, guanli.glmm) == 0))
{
guanlimenu();
return;
}
else
{
printf("\t\t账号或密码错误！！！\n");
Sleep(500);
return;
}
}
void guanlimenu()//管理员菜单
{
int select = 0;
printf("\n\t\t\t++++++++++++++++++++++++\n\t\t\t+ 欢迎使用管理员系统 +\n\t\t\t++++++++++++++++++++++++\n");
system("color 1F"); //程序面板颜色
while (now)
{
system("cls");
do
{
system("cls");
printf("\n ******************菜单栏*****************\n");
printf("\t\t*\t ①查看用户信息 *\n");
printf("\t\t*\t ②修改用户信息 *\n");
printf("\t\t*\t ③修改管理员账户 *\n");
printf("\t\t*\t ④退出系统 *\n");
printf(" *****************************************\n");
printf("\n");
printf("\t\t请输入选项：[\t]\b\b\b");
scanf("%d", &select);
} while (select > 5 || select < 1);
guanlistart(select);
}
}
void guanlistart(int math)//中转
{
switch (math)
{
case 1:
look();
break;
case 2:
change();
break;
case 3:
xiugai();
break;
case 4:
printf("感谢您的支持！\n欢迎下次使用！");
Sleep(500);
menu();
break;
}
}
void look()//查看用户信息
{
system("cls");
FILE* fp = fopen("Users.dat","rb+");
A a;
fread(&a, sizeof(A), 1, fp);
while (1)
{
printf("%s\n%s\n%s\n\n",a.name,a.zh,a.mm);
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
break;
}
}
char fanhui;
fanhui = _getch();
if (fanhui == '\r')
{
Sleep(500);
return;
}
}
void change()//修改用户信息
{
system("cls");
A a,b;
int number;
char name[20];
FILE* fp = fopen("Users.dat","rb+");
fread(&a,sizeof(A),1,fp);
printf("请输入要修改账号的用户名：\n");
scanf("%s",&name);
while (1)
{
if (strcmp(a.name, name) == 0)
{
break;
}
else
{
if (!feof(fp))
{
fread(&a, sizeof(A), 1, fp);
}
else
{
printf("该用户不存在！！！\n");
fclose(fp);
Sleep(500);
return;
}
}
}
printf("\n%s\n%s\n%s\n",a.name,a.zh,a.mm);
printf("请选择需要修改的项目：用户名（1），账号（2），密码（3）\n");
scanf("%d",&number);
while (1)
{
switch (number)
{
case 1:
printf("新的用户名：");
scanf("%s",b.name);
strcpy(a.name,b.name);
fseek(fp, -((int)(sizeof(A))), SEEK_CUR);
fprintf(fp, "%s", a.name);
printf("用户名修改成功!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
case 2:
printf("新的账号：");
scanf("%s", b.zh);
strcpy(a.zh, b.zh);
fseek(fp, -((int)(sizeof(A) - 20)), SEEK_CUR);
fprintf(fp, "%s", a.zh);
printf("账号修改成功!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
case 3:
printf("新的密码：");
scanf("%s", b.mm);
strcpy(a.mm, b.mm);
fseek(fp, -((int)(sizeof(A) - 40)), SEEK_CUR);
fprintf(fp, "%s", a.mm);
printf("密码修改成功!\n");
Sleep(500);
fclose(fp);
Sleep(1500);
return;
}
}
}
void xiugai()//修改管理员账号
{
guanliyuan guanli;
FILE* fp;
fp = fopen("guanliyuan.dat", "rb+");
char a[20], b[20];
printf("\t\t请输入新账号：");
scanf("%s",&a);
printf("\n\t\t请输入新密码：");
scanf("%s", &b);
strcpy(guanli.glzh, a);
strcpy(guanli.glmm, b);
fseek(fp, -((int)(sizeof(guanliyuan))), SEEK_CUR);
fprintf(fp,"%s",guanli.glzh);
fseek(fp, -((int)(sizeof(guanliyuan))-20), SEEK_CUR);
fprintf(fp, "%s", guanli.glmm);
fclose(fp);
printf("\n\t\t修改成功！");
Sleep(1000);
return;
}