本篇还有许多功能未写好

前言

先看要求，要有：学生系统，老师系统，管理员系统。这个跟以往的不同，传统的我觉得是从老师视角看，同时老师也有管理员权限，对学生的成绩，信息进行操作。现在类似于把权利细分，我们不妨先思考下，各个部分的职能应该是什么？

学生：

注册/登陆账号
修改自己的个人信息
查看自己的成绩（但是不能查看自己的排名）

老师

注册/登陆账号
修改自己的个人信息
修改学生的信息
可以对学生信息进行一些经典操作。

管理员

可以登陆账号，账号只能从后台文件中添加。
可以把个人账号设置为老师账号（下面会有解释）
可以查看/修改所有账号信息

本篇代码的按照 $C$ 语言的逻辑/操作写，按照 $C$ ++ $11$ 编译。

注：本人能力有限，权利可以更加细分，如：老师可以细分到是哪个班的老师，管理员可以拥有所有权限，而且可以写成可以分配给一些老师特殊的权限，但因篇幅有限，码力不足，同时也为了简介，笔者就不多写了 ~~（懒就直说）~~ 。

正篇

注册/登陆账号的实现

懒得写OVQ,改天吧，阿巴阿巴

源代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <windows.h>

const int NAME_LEN = 50;//名字的长度 
const int PASSWORD_LEN = 100;//密码长度 
const int ACCOUNT_LEN = 100;//账号长度
const int USER_MAXN = 5000;//账号个数 
const int TEACHER_MAXN = 1000;//老师人数 
const int STUDENT_MAXN = 1000;//学生总人数
const int ADMIN_MAXN = 1000;//管理员人数 

struct User{
	char account[ACCOUNT_LEN];
	char password[PASSWORD_LEN];
	// 0 表示身份未定义/信息未定义 
	// 1 表示学生 
	// 2 表示老师
	// 3 表示管理员 
	int type;
	int number;//表示当前账号类型在该类型中的位置 
}user[USER_MAXN] , user_now;

struct Student {
	char name[NAME_LEN];//名字长度 
	int sex_idx; //0 男 ， 1 女. 
	int chinese;
	int math;
	int english;
}student[STUDENT_MAXN] , student_now;

struct Teacher{
	char name[NAME_LEN];
}teacher[TEACHER_MAXN] , teacher_now;

struct Admin{
	
}admin[ADMIN_MAXN] , admin_now; 

int user_num;//账户数量 
int student_num;//学生数量 
int teacher_num;//老师数量 
int wrong_count;//容错次数 

int check_account(char account[] , char password[]);
void Pretreatment();//初始化
void Pretreatment_user();
void Pretreatment_admin();
void Pretreatment_teacher();
void Pretreatment_student();
void main_menu();//菜单 
void login();//登录 
void _register();//注册 
void save_user();//更新
void type0_menu();//没有更新过信息的
void type1_menu();//学生 
void type2_menu();//老师 
void type3_menu();//管理员 
void student_inf();//学生信息更新
void teacher_inf();//老师信息更新 
void teacher_menu();//老师菜单 
void student_menu();//学生菜单 
void save_student();//保存学生信息 
void save_teacher();//保存老师信息 
void deply_inf_student();//展示学生个人信息 
void deply_sc_student();//展示学生分数 
void change_stu_sc();//改变学生分数 
void sort_menu();//排序菜单 
void deplay_all();//列出当前排列的学生排名
void sort_sum();//按照总分排名
void sort_chinese();//按照语文排名
void sort_math();//按照数学排名
void sort_english();//按照英语排名 

int main()
{
	Pretreatment();
	main_menu();
	return 0;
}

void change_stu_sc()
{
	printf("请输入学生编号:\n");
	int pos;
	scanf("%d" , &pos);
	printf("%s 同学当前的分数是（如果是-1，代表尚未更新）：\n" , student[pos].name); 
	printf("语文:%d\t数学:%d\t英语:%d\n");
	printf("请输入修改过过后的三个分数:");
	scanf("%d %d %d" , &student[pos].chinese,&student[pos].math , &student[pos].english);	
	save_student();
	Pretreatment();
}

void sort_menu()
{
	
}
void deplay_all()
{
	
}
void sort_sum()
{
	
}
void sort_chinese()
{
	
}
void sort_math()
{
	
}
void sort_english()
{
	
}

void login()
{
	system("cls");
	char input_account[ACCOUNT_LEN];
	char input_password[PASSWORD_LEN];
	
	printf("请输入账号:");
	scanf("%s" , input_account);
	printf("请输入密码:");
	scanf("%s" , input_password);
	
	if (check_account(input_account , input_password))
	{
		if (user_now.type == 0) type0_menu();
		else if(user_now.type == 1) type1_menu();
		else if(user_now.type == 2) type2_menu();
		else if(user_now.type == 3) type3_menu();
	}
	else
	{
		wrong_count ++;
		if (wrong_count == 3) exit(0);
		printf("账号不存在或密码错误\n");
		printf("您还可以尝试: %d 次，持续错误将退出程序.\n",3 - wrong_count);
		printf("请重新输入\n");
		login(); 
	}
}

void student_menu()
{
	system("cls");
	printf("欢迎您：%s 同学" , student_now.name);
	puts("您可以选择：");
	puts("1.查看个人信息");
	puts("2.查看成绩");
	
	int operation;
	scanf("%d" , &operation);
	
	switch(operation)
	{
		case 1:
			deply_inf_student();
			break;
		case 2:
			deply_sc_student();
			break;	
		default:
			printf("请输入合法的操作序号!");
			student_menu();
			break;
	}
}

void deply_inf_student()
{
	system("cls");
	printf("姓名: %s\n" , student_now.name); 
	printf("性别 : "); 
	if (!student_now.sex_idx) puts("男");
	else puts("女"); 
}

void deply_sc_student()
{
	system("cls"); 
	if (student_now.chinese == -1) puts("老师尚未更新成绩");
	else {
		printf("您的语文成绩：%d\n" , student_now.chinese);
		printf("您的数学成绩: %d\n" , student_now.math);
		printf("您的英语成绩: %d\n" , student_now.english);
	} 
}

void teacher_menu()
{
	system("cls");
	printf("欢迎您：%s 老师" , teacher_now.name); 
	printf("您可以选择:\n");
	puts("1.更新学生成绩");
	puts("2.将学生成绩排序");
	puts("3.展示当前排列的学生成绩"); 
	 
	int operation;
	scanf("%d" , &operation);
	switch(operation)
	{
			case 1:
				change_stu_sc();
				break;
			case 2:
				sort_menu();
				break;
			case 3:
				deplay_all();
				break;
			default:
				printf("请输入合法的操作序号!");
				teacher_menu();
				break;
	} 
}

void student_inf()
{
	system("cls"); 
	printf("请输入姓名:");
	scanf("%s" , student_now.name);
	printf("请输入性别(0/男，1/女):");
	scanf("%d" , &student_now.sex_idx);
	student_now.chinese = -1;
	student_now.math = -1;
	student_now.english = -1;
	student_num ++;
	
	strcpy(student[student_num].name , student_now.name); 
	student[student_num].sex_idx = student_now.sex_idx;
	student[student_num].chinese = student_now.chinese;
	student[student_num].math = student_now.math;
	student[student_num].english = student_now.english;
	user_now.number = student_num;
	user_now.type = 1;
	
	for (int i = 1;i <= user_num;i ++) {
		if (!strcmp(user[i].account , user_now.account)) {
			user[i].number = user_now.number;
			user[i].type = user_now.type;
			break;
		}
	}
	
	save_user();
	save_student();
	Pretreatment();
	
	printf("您已经更新个人信息，将在 3 秒后返回学生界面\n");
	Sleep(3000);
	student_menu();
}

void teacher_inf()
{
	printf("请输入姓名:");
	scanf("%s" , teacher_now.name);
	teacher_num ++;
	
	strcpy(teacher[teacher_num].name , teacher_now.name);
	user_now.number = teacher_num;
	user_now.type = 2;
	
	for (int i = 1;i <= user_num;i ++) {
		if (!strcmp(user[i].account , user_now.account)) {
			user[i].number = user_now.number;
			user[i].type = user_now.type;
			break;
		}
	}
	
	save_user();
	save_teacher();
	Pretreatment(); 
	
	printf("您已经更新个人信息，将在 3 秒后返回老师界面\n");
	Sleep(3000);
	teacher_menu();
}

void type0_menu()
{
	printf("检测到您没有更新信息:\n");
	printf("您是老师，还是学生?\n");
	puts("1.学生");
	puts("2.老师");
	
	int operation; 
	scanf("%d" , &operation);
	
	switch(operation)
	{
		case 1:
			student_inf();
			break;
		case 2:
			teacher_inf();
			break;
		default:
			printf("请输入合法的操作序号!");
			main_menu();
			break;
	}
}

void type1_menu()
{
	int pos = user_now.number;
	strcpy(student_now.name ,student[pos].name);
	student_now.sex_idx = student[pos].sex_idx;
	student_now.chinese = student[pos].chinese;
	student_now.math = student[pos].math;
	student_now.english = student[pos].english;
	student_menu();
}

void type2_menu()
{
	strcpy(teacher_now.name , teacher[user_now.number].name);
	teacher_menu();
}

void type3_menu()
{
	
}

void main_menu()
{
	system("cls"); 
	puts("Welcome to Zsh'student_system'");
	printf("1.登录\n");
	printf("2.注册\n"); 
	printf("3.退出\n");
	
	int operation;
	printf("请输入操作:"); 
	scanf("%d" , &operation);
	
	switch(operation)
	{
		case 1:
			login();
			break;
		case 2:
			_register();
			break;
		case 3:
			exit(0);
		default:
			printf("请输入合法的操作序号!");
			main_menu();
			break;
	}
}

void Pretreatment_student()
{
	FILE *fp_student = fopen("pretreatment_student.txt" , "r");
	//载入所有学生
	fscanf(fp_student , "%d" , &student_num);
	for (int i = 1;i <= student_num;i ++) {
		fscanf(fp_student , "%s%d%d%d%d" , student[i].name , &student[i].sex_idx , &student[i].chinese , &student[i].math , &student[i].english);
	}
	
	fclose(fp_student);
}

void save_student()
{
	FILE *fp_student = fopen("pretreatment_student.txt" , "w");
	//载入所有学生
	fprintf(fp_student , "%d\n" , student_num);
	for (int i = 1;i <= student_num;i ++) {
		fprintf(fp_student , "%s\n%d\n%d\n%d\n%d\n" , student[i].name , student[i].sex_idx , student[i].chinese , student[i].math , student[i].english);
	}
	
	fclose(fp_student);			
}

void Pretreatment_user()
{
	FILE *fp = fopen("pretreatment.txt" , "r");
	//载入所有账号 
	fscanf(fp , "%d" , &user_num);
	for (int i = 1;i <= user_num;i ++) {
		fscanf(fp , "%s%s%d%d" , user[i].account , user[i].password , &user[i].type , &user[i].number);
	}
	fclose(fp);
}

void Pretreatment_teacher()
{
	FILE *fp_teacher = fopen("pretreatment_teacher.txt" , "r");
	
	//载入所有老师
	fscanf(fp_teacher , "%d" , &teacher_num);
	for (int i = 1;i <= teacher_num;i ++) {
		fscanf(fp_teacher , "%s" , teacher[i].name);
	}
	fclose(fp_teacher);
}

void save_teacher()
{
	FILE *fp_teacher = fopen("pretreatment_teacher.txt" , "w");
	
	//载入所有老师
	fprintf(fp_teacher , "%d\n" , teacher_num);
	for (int i = 1;i <= teacher_num;i ++) {
		fprintf(fp_teacher , "%s" , teacher[i].name);
	}
	fclose(fp_teacher);
}


void Pretreatment_admin()
{
	
}

//预处理,载入所有文件 
void Pretreatment()
{
	wrong_count = 0;
	Pretreatment_user();
	Pretreatment_teacher();
	Pretreatment_student();
	Pretreatment_admin();
	/*测试文件载入是不是正常 
	printf("%d\n" , user_num);
	for (int i = 1;i <= user_num;i ++) {
		printf("%s\n%s\n%d\n%d\n" , user[i].account , user[i].password , user[i].type , user[i].number);
	}
	
	printf("%d\n" , student_num);
	for (int i = 1;i <= student_num;i ++) {
		printf("%s\n" , student[i].name);
		printf("%d\n%d %d %d\n" , student[i].sex_idx , student[i].chinese , student[i].math , student[i].english);
	}
	*/
}

void save_user()
{
	FILE *fp = fopen("pretreatment.txt" , "w");
	fprintf(fp , "%d\n" , user_num);
	for (int i = 1;i <= user_num;i ++) {
		fprintf(fp , "%s\n%s\n%d\n%d\n" , user[i].account , user[i].password , user[i].type , user[i].number);
	}
	fclose(fp);
}

void main_menu2()
{
	system("cls"); 
	puts("Welcome to Zsh'student_system'");
	printf("1.登录\n");
	printf("2.退出\n");
	
	int operation;
	printf("请输入操作:"); 
	scanf("%d" , &operation);
	
	switch(operation)
	{
		case 1:
			login();
			break;
		case 2:
			exit(0);
		default:
			printf("请输入合法的操作序号!");
			main_menu();
			break;
	}
}

void _register()
{
	system("cls");
	printf("您好，欢迎来到注册界面.\n");
	printf("请输入注册账号:");
	scanf("%s" , user_now.account);
	
	for (int i = 1;i <= user_num;i ++) {
		if (!strcmp(user[i].account , user_now.account))
		{
			printf("检测到有重复，将在 3s 返回注册界面，请重新输入，进行注册:");
			Sleep(3000);
			_register(); 
		}
	}
	
	printf("请输入注册密码: ");
	scanf("%s" , user_now.password);
	user_num ++;
	
	strcpy(user[user_num].account , user_now.account);
	strcpy(user[user_num].password , user_now.password);
	user[user_num].type = 0;
	
	save_user();
	printf("注册成功，将在 3 秒后返回主菜单.\n");
	Sleep(3000);
	main_menu2();
}

int check_account(char account[] , char password[])
{
	printf("%d\n" , user_num);
	for (int i = 1;i <= user_num;i ++) {
		if (!strcmp(account , user[i].account) && !strcmp(password , user[i].password))
		{
			strcpy(user_now.account , user[i].account);//复制当前账号 
			strcpy(user_now.password , user[i].password);//复制当前密码 
			user_now.number = user[i].number;//记录当前用户编号 
			user_now.type = user[i].type;//记录当前用户类型 
			return 1;//如果找到，那么返回1
		}
	}
	return 0;
}