diff --git a/class01.c b/class01.c
new file mode 100644
index 0000000..785a800
--- /dev/null
+++ b/class01.c
@@ -0,0 +1,643 @@
+#include<stdbool.h>
+#include<limits.h>
+#include<math.h>
+#include<stdlib.h>
+#include<conio.h>
+#include<Windows.h>
+#include<stdio.h>
+#include<string.h>
+
+
+
+unsigned int counts = 0;
+
+
+
+/*结构体定义*/
+typedef struct student {
+	char no[21];
+	char name[11];
+	bool fame;
+	unsigned short int age;
+	char oth[151];
+	struct student * next;
+}student;
+
+struct student * first = NULL;//第一个
+struct student * loc = NULL;//当前(一般为NULL)
+
+void input(void);//输入
+void print(void);//打印所有
+void print_1(const student *);//打印单个
+bool del(char *);//删除单个
+void creat(const student);//创造单个
+bool edit(char*);//编辑单个
+void save(void);//全部保存
+student * search_by_no(char *);//按学号查找
+void search_by_name(char *);//按名字搜索
+void search_by_sex(bool);//按性别搜索
+void search_by_age(unsigned short int);//按年龄搜索
+void show_menu(void);//显示菜单
+void exith(void);//退出(清理程序内容)
+bool check_password(void);//检查密码
+void run(void);//程序开始接入点
+bool load(void);//从文件加载数据
+void fgets_nn(char * , int, FILE *);//丢弃换行符的整行char*输入
+bool check_no(char *);//检查学号是否冲突
+
+int main() {
+	run();
+	system("pause");
+	return 0;
+}
+
+void show_menu(void) {
+	printf("a.学生基本信息录入\n");
+	printf("b.学生基本信息显示\n");
+	printf("c.学生基本信息保存\n");
+	printf("d.学生基本信息删除\n");
+	printf("e.学生基本信息修改\n");
+	printf("f.学生基本信息查询\n");
+	printf("g.退出系统\n");
+	char t = getch();
+	switch (t) {
+		case 'a':
+			input();
+			show_menu();
+			break;
+		case 'b':
+			system("cls");
+			print();
+			system("pause");
+			system("cls");
+			show_menu();
+			break;
+		case 'c':
+			save();
+			system("cls");
+			printf("保存完成!\n");
+			show_menu();
+			break;
+		case 'd':
+		{
+			char no_t[21];
+			system("cls");
+			print();
+			printf("\n请输入要删除的学生的学号:\n");
+			while (1) {
+				fgets_nn(no_t, 21, stdin);
+				if (!strcmp(no_t, "\0")) {
+					printf("学号不能为空:\n");
+					continue;
+				}
+				break;
+			}
+			if (del(no_t)) {
+				system("cls");
+				printf("删除成功!\n\n");
+			}
+			else {
+				system("cls");
+				printf("删除失败!不存在该学号的学生!\n\n");
+			}
+			show_menu();
+			break;
+		}
+		case 'e':
+		{
+			char no_t[21];
+			system("cls");
+			if (!check_password()) {
+				system("cls");
+				printf("密码验证失败!\n");
+				show_menu();
+			}
+			system("cls");
+			print();
+			printf("\n请输入要修改的学生的学号:\n");
+			while (1) {
+				fgets_nn(no_t, 21, stdin);
+				if (!strcmp(no_t, "\0")) {
+					printf("学号不能为空:\n");
+					continue;
+				}
+				break;
+			}
+			if (edit(no_t)) {
+				system("cls");
+				printf("修改成功!\n\n");
+			}
+			else {
+				system("cls");
+				printf("修改失败!不存在该学号的学生\n\n");
+			}
+			show_menu();
+			break;
+		}
+		case 'f':
+		{
+			system("cls");
+			char mod;
+			while (1) {
+				printf("请输入模式:\n");
+				printf("(1)按学号查询\n");
+				printf("(2)按姓名查询\n");
+				printf("(3)按性别查询\n");
+				printf("(4)按年龄查询\n");
+				mod = getch();
+				if (mod - '0' < 1 || mod - '0'>4) {
+					system("cls");
+					printf("输入错误\n\n");
+					continue;
+				}
+				system("cls");
+				break;
+			}
+			switch (mod - '0') {
+				case 1:
+				{//建立一个块,防止case内定义被编译器报错
+					char tem[21];
+					printf("\n请输入要查询的学生的学号:\n");
+					while (1) {
+						fgets_nn(tem, 21, stdin);
+						if (!strcmp(tem, "\0")) {
+							system("cls");
+							printf("学号不能为空,请输入要查询的学生的学号:\n");
+							continue;
+						}
+						break;
+					}
+					student *ge = search_by_no(tem);
+					if (ge == NULL) {
+						printf("不存在该学号的学生!请检查输入的内容!\n");
+					}
+					else {
+						system("cls");
+						printf("查询到学号为%s的学生如下:\n\n", tem);
+						print_1(ge);
+					}
+					break;
+				}
+				case 2:
+				{
+					char name[11];
+					printf("请输入学生姓名:\n");
+					do {
+						fgets_nn(name, 11, stdin);
+					} while (!strcmp(name, "\0"));
+					search_by_name(name);
+					break;
+				}
+				case 3:
+				{
+					bool fame;
+					while (1) {
+						printf("请输入学生性别(1.男  2.女):\n");
+						char t = getch();
+						if (t == '1') {
+							fame = true;
+							break;
+						}
+						else if (t == '2') {
+							fame = false;
+							break;
+						}
+						else {
+							system("cls");
+							printf("输入不正确,请重新输入学生性别(1.男  2.女):\n");
+							continue;
+						}
+					}
+					search_by_sex(fame);
+					break;
+				}
+				case 4:
+				{
+					unsigned short int age;
+					while (1) {
+						printf("请输入学生年龄:\n");
+						if (scanf("%hd", &age) != 1) {
+							system("cls");
+							printf("输入不正确,请重新输入学生年龄:\n");
+							while (getchar() != '\n')continue;
+							continue;
+						}
+						break;
+					}
+					search_by_age(age);
+					break;
+				}
+			}
+			system("pause");
+			system("cls");
+			show_menu();
+			break;
+		}
+		case 'g':
+			save();
+			system("cls");
+			printf("数据已保存,正在退出系统!\n");
+			exith();
+			break;
+		default:
+			system("cls");
+			printf("输入错误!\n\n");
+			show_menu();
+			break;
+	}
+}
+
+void input(void) {
+	student temp;
+	char t;
+	while (1) {
+		system("cls");
+		printf("请输入学生学号,退出输入请直接回车:\n");
+		while (1) {
+			fgets_nn(temp.no, 21, stdin);
+			if (!check_no(temp.no))
+				printf("学号已存在!\n");
+			else
+				break;
+		}
+		if (!strcmp(temp.no, "\0")) {
+			return;
+		}
+		printf("请输入学生姓名:\n");
+		do {
+			fgets_nn(temp.name, 11, stdin);
+		} while (!strcmp(temp.name, "\0"));
+		while (1) {
+			printf("请输入学生性别(1.男  2.女):\n");
+			t = getch();
+			if (t == '1') {
+				temp.fame = true;
+				printf("男\n");
+				break;
+			}
+			else if (t == '2') {
+				temp.fame = false;
+				printf("女\n");
+				break;
+			}
+			else {
+				printf("输入不正确\n");
+				continue;
+			}
+		}
+		while (1) {
+			printf("请输入学生年龄:\n");
+			if (scanf("%hd", &temp.age) != 1) {
+				printf("输入不正确\n");
+				while (getchar() != '\n')continue;
+				continue;
+			}
+			break;
+		}
+		printf("备注:\n");
+		while (getchar() != '\n')continue;
+		fgets_nn(temp.oth, 151, stdin); 
+		creat(temp);
+		system("pause");
+		counts++;
+		save();
+	}
+
+}
+
+void creat(const student t) {
+	if (first == NULL) {
+		first = (student*)malloc(sizeof(student));
+		loc = first;
+		first->next = NULL;
+	}
+	else {
+		loc->next= (student*)malloc(sizeof(student));
+		loc = loc->next;
+		loc->next = NULL;
+	}
+	loc->age = t.age;
+	loc->fame = t.fame;
+	int i=0;
+	for(i=0;i<11&&t.name[i>0?i-1:0]!='\0';i++)
+	loc->name[i] = t.name[i];
+	for (i = 0; i < 21&&t.no[i > 0 ? i - 1 : 0] != '\0'; i++)
+	loc->no[i] = t.no[i];
+	for (i = 0; i < 151; i++)
+	loc->oth[i] = t.oth[i];
+}
+
+void print(void) {
+	student * l = first;
+	printf("系统内共有%d名学生数据:\n\n", counts);
+	while (l != NULL) {
+		print_1(l);
+		printf("\n");
+		l = l->next;
+	}
+}
+
+void print_1(const student * t) {
+	printf("学号:%s\n", t->no);
+	printf("姓名:%s\n", t->name);
+	printf("性别:%s\n", t->fame ? "男": "女");
+	printf("年龄:%d\n", t->age);
+	printf("备注:%s\n", t->oth);
+}
+
+void exith(void) {
+	student *l = first;
+	student n;
+	while (l != NULL) {
+		n = *l;
+		free(l);
+		l = n.next;
+	}
+	printf("系统已退出!\n");
+	system("pause");
+	exit(1);
+}
+
+void run(void) {
+	int n=3;
+	while (n--) {
+		if (check_password()) {
+			load();
+			show_menu();
+		}
+		else if(n!=0){
+			printf("密码错误,你还有%d次机会!\n",n);
+		}
+	}
+	printf("身份验证失败,正在退出系统\n");
+	exith();
+}
+
+void save(void) {
+	FILE * data;
+	data = fopen("data", "w");
+	student * l = first;
+	while (l != NULL) {
+		fprintf(data, "%s\n", l->no);
+		fprintf(data, "%s\n", l->name);
+		fprintf(data, "%d\n", l->fame);
+		fprintf(data, "%d\n", l->age);
+		fprintf(data, "%s\n", l->oth);
+		l = l->next;
+	}
+	fclose(data);
+}
+
+bool load(void) {
+	FILE * data;
+	data = fopen("data", "r");
+	if (data == NULL)
+		return false;
+	student temp;
+	while (1) {
+		fgets_nn(temp.no, 21, data);
+		if (feof(data)){
+			break;
+		}
+		fgets_nn(temp.name, 11, data);
+		fscanf(data, "%hhu", &temp.fame);
+		fscanf(data, "%hd", &temp.age);
+		fgetc(data);//去除留下的\n
+		fgets_nn(temp.oth, 151, data);
+		creat(temp);
+		counts++;
+	}
+	fclose(data);
+	return true;
+}
+
+bool del(char * no) {
+	
+	student *ed = search_by_no(no);
+	if (ed == NULL)
+		return false;
+	student temp;
+	if (ed == first) {
+		temp = *first;
+		free(first);
+		first = temp.next;
+		return true;
+	}
+	student *lu = first;
+	while (lu->next != NULL) {
+		if (strlen(lu->next->no) == strlen(no) && !strcmp(lu->next->no, no)) {
+			break;
+		}
+		lu = lu->next;
+	}
+	temp = *lu->next;
+	free(lu->next);
+	lu->next = temp.next;
+	counts--;
+	save();
+	return true;
+}
+
+bool check_password(void) {
+	FILE * password;
+	password = fopen("password", "r");
+	if (password == NULL) {
+		printf("第一次进入系统,请先设置密码(最长16位,最短6位):\n");
+		password = fopen("password", "w");
+		system("attrib password +s +h +r");
+		char pw[17];
+		char pw2[17];
+		while (1) {
+			fgets_nn(pw, 17, stdin);
+			if (strlen(pw) < 6) {
+				system("cls");
+				printf("密码至少设置6位:\n");
+				continue;
+			}
+			system("cls");
+			printf("请确认密码:\n");
+			fgets_nn(pw2, 17, stdin);
+			if (strcmp(pw, pw2)||(strlen(pw)!=strlen(pw2))) {
+				system("cls");
+				printf("密码确认错误,请重新设置密码:\n");
+				continue;
+			}
+			break;
+		}
+		fprintf(password, "%s", pw);
+		fclose(password);
+		system("cls");
+		return true;
+	}
+	char pw[17];
+	fgets_nn(pw, 17, password);
+	if (feof(password)) {
+		fclose(password);
+		system("attrib password -s -h -r");
+		remove("password");
+		return check_password();
+	}
+	printf("请输入密码:\n");
+	char pwi[17];
+	fgets_nn(pwi, 17, stdin);
+	system("cls");
+	if (!strcmp(pw, pwi))
+		return true;
+	else
+		return false;
+}
+
+student * search_by_no(char * no) {
+	student *l = first;
+	while (l != NULL) {
+		if (strlen(l->no) == strlen(no) && !strcmp(l->no, no)) {
+			return l;
+		}
+		l = l->next;
+	}
+	return NULL;
+}
+
+void search_by_name(char * name) {
+	student *l = first;
+	unsigned int c = 0;
+	system("cls");
+	while (l != NULL) {
+		if (strlen(l->name) == strlen(name) && !strcmp(l->name, name)) {
+			print_1(l);
+			printf("\n");
+			c++;
+		}
+		l = l->next;
+	}
+	if (c == 0) {
+		printf("未检索到内容!\n");
+	}
+	else {
+		printf("\n已检索到%d条名字为%s的学生\n\n", c, name);
+	}
+}
+
+void search_by_sex(bool fame) {
+	student *l = first;
+	unsigned int c = 0;
+	system("cls");
+	while (l != NULL) {
+		if (l->fame == fame) {
+			print_1(l); 
+			printf("\n");
+			c++;
+		}
+			l = l->next;
+	}
+	if (c == 0) {
+		printf("未检索到内容!\n");
+	}
+	else {
+		printf("\n已检索到%d条性别为%s的学生\n\n", c, fame ? "男" : "女");
+	}
+}
+
+void search_by_age(unsigned short int age) {
+	student *l = first;
+	unsigned int c = 0;
+	system("cls");
+	while (l != NULL) {
+		if (l->age == age) {
+			print_1(l);
+			printf("\n");
+			c++;
+		}
+		l = l->next;
+	}
+	if (c == 0) {
+		printf("未检索到内容!\n");
+	}
+	else {
+		printf("\n已检索到%d条年龄为%d的学生\n\n", c, age);
+	}
+}
+
+bool edit(char * no) {
+	student *l = search_by_no(no);
+	if (l == NULL)
+		return false;
+
+	printf("请输入学生学号:\n");
+	while (1) {
+		char no_temp[21];
+		fgets_nn(no_temp, 21, stdin);
+		if (!strcmp(no_temp, "\0")) {
+			printf("学号不能为空:\n");
+			continue;
+		}
+		if (!(strlen(l->no) == strlen(no_temp) && !strcmp(l->no, no_temp))) 
+			if (!check_no(no_temp))
+				printf("学号已存在!\n");
+			else {
+				int i=0;
+				for ( i = 0; i < 21; i++)
+					l->no[i] = no_temp[i];
+				break;
+			}
+		else 
+			break;
+	}
+	printf("请输入学生姓名:\n");
+	do {
+		fgets_nn(l->name, 11, stdin);
+	} while (!strcmp(l->name, "\0"));
+	while (1) {
+		printf("请输入学生性别(1.男  2.女):\n");
+		char t = getch();
+		if (t == '1') {
+			l->fame = true;
+			break;
+		}
+		else if (t == '2') {
+			l->fame = false;
+			break;
+		}
+		else {
+			printf("输入不正确\n");
+			continue;
+		}
+	}
+	while (1) {
+		printf("请输入学生年龄:\n");
+		if (scanf("%hd", &l->age) != 1) {
+			printf("输入不正确\n");
+			while (getchar() != '\n')continue;
+			continue;
+		}
+		break;
+	}
+	printf("备注:\n");
+	while (getchar() != '\n')continue;
+	fgets_nn(l->oth, 151, stdin);
+
+	save();
+	return true;
+}
+
+void fgets_nn(char *buffer, int max, FILE * file) {
+	fgets(buffer, max, file);
+	int i=0;
+	for (i = 0; i < max; i++) {
+		if (buffer[i] == '\n') {
+			buffer[i] = '\0';
+			return;
+		}
+	}
+}
+
+bool check_no(char * no) {
+	student *l = first;
+	while (l != NULL) {
+		if (strlen(l->no) == strlen(no) && !strcmp(l->no, no)) {
+			return false;
+		}
+		l = l->next;
+	}
+	return true;
+}
diff --git a/shl02.c b/shl02.c
new file mode 100644
index 0000000..b18f1cc
--- /dev/null
+++ b/shl02.c
@@ -0,0 +1,263 @@
+#include<stdbool.h>
+#include<limits.h>
+#include<math.h>
+#include<stdlib.h>
+#include<conio.h>
+#include<Windows.h>
+#include<stdio.h>
+#include<string.h>
+
+
+
+unsigned int counts = 0;
+
+
+
+/*结构体定义*/
+typedef struct student {
+	char no[21];
+	char name[11];
+	bool fame;
+	unsigned short int age;
+	char oth[151];
+	struct student * next;
+}student;
+
+struct student * first = NULL;//第一个
+struct student * loc = NULL;//当前(一般为NULL)
+
+bool del(char *);//删除单个
+bool edit(char*);//编辑单个
+student * search_by_no(char *);//按学号查找
+void search_by_name(char *);//按名字搜索
+bool check_password(void);//检查密码
+void run(void);//程序开始接入点
+bool load(void);//从文件加载数据
+void fgets_nn(char * , int, FILE *);//丢弃换行符的整行char*输入
+bool check_no(char *);//检查学号是否冲突
+
+int main() {
+	run();
+	system("pause");
+	return 0;
+}
+bool del(char * no) {
+	
+	student *ed = search_by_no(no);
+	if (ed == NULL)
+		return false;
+	student temp;
+	if (ed == first) {
+		temp = *first;
+		free(first);
+		first = temp.next;
+		return true;
+	}
+	student *lu = first;
+	while (lu->next != NULL) {
+		if (strlen(lu->next->no) == strlen(no) && !strcmp(lu->next->no, no)) {
+			break;
+		}
+		lu = lu->next;
+	}
+	temp = *lu->next;
+	free(lu->next);
+	lu->next = temp.next;
+	counts--;
+	save();
+	return true;
+}
+ bool edit(char * no) {
+	student *l = search_by_no(no);
+	if (l == NULL)
+		return false;
+
+	printf("请输入学生学号:\n");
+	while (1) {
+		char no_temp[21];
+		fgets_nn(no_temp, 21, stdin);
+		if (!strcmp(no_temp, "\0")) {
+			printf("学号不能为空:\n");
+			continue;
+		}
+		if (!(strlen(l->no) == strlen(no_temp) && !strcmp(l->no, no_temp))) 
+			if (!check_no(no_temp))
+				printf("学号已存在!\n");
+			else {
+				int i=0;
+				for ( i = 0; i < 21; i++)
+					l->no[i] = no_temp[i];
+				break;
+			}
+		else 
+			break;
+	}
+	printf("请输入学生姓名:\n");
+	do {
+		fgets_nn(l->name, 11, stdin);
+	} while (!strcmp(l->name, "\0"));
+	while (1) {
+		printf("请输入学生性别(1.男  2.女):\n");
+		char t = getch();
+		if (t == '1') {
+			l->fame = true;
+			break;
+		}
+		else if (t == '2') {
+			l->fame = false;
+			break;
+		}
+		else {
+			printf("输入不正确\n");
+			continue;
+		}
+	}
+	while (1) {
+		printf("请输入学生年龄:\n");
+		if (scanf("%hd", &l->age) != 1) {
+			printf("输入不正确\n");
+			while (getchar() != '\n')continue;
+			continue;
+		}
+		break;
+	}
+	printf("备注:\n");
+	while (getchar() != '\n')continue;
+	fgets_nn(l->oth, 151, stdin);
+
+	save();
+	return true;
+}
+student * search_by_no(char * no) {
+	student *l = first;
+	while (l != NULL) {
+		if (strlen(l->no) == strlen(no) && !strcmp(l->no, no)) {
+			return l;
+		}
+		l = l->next;
+	}
+	return NULL;
+}
+void search_by_name(char * name) {
+	student *l = first;
+	unsigned int c = 0;
+	system("cls");
+	while (l != NULL) {
+		if (strlen(l->name) == strlen(name) && !strcmp(l->name, name)) {
+			print_1(l);
+			printf("\n");
+			c++;
+		}
+		l = l->next;
+	}
+	if (c == 0) {
+		printf("未检索到内容!\n");
+	}
+	else {
+		printf("\n已检索到%d条名字为%s的学生\n\n", c, name);
+	}
+}
+void run(void) {
+	int n=3;
+	while (n--) {
+		if (check_password()) {
+			load();
+			show_menu();
+		}
+		else if(n!=0){
+			printf("密码错误,你还有%d次机会!\n",n);
+		}
+	}
+	printf("身份验证失败,正在退出系统\n");
+	exith();
+}
+bool check_password(void) {
+	FILE * password;
+	password = fopen("password", "r");
+	if (password == NULL) {
+		printf("第一次进入系统,请先设置密码(最长16位,最短6位):\n");
+		password = fopen("password", "w");
+		system("attrib password +s +h +r");
+		char pw[17];
+		char pw2[17];
+		while (1) {
+			fgets_nn(pw, 17, stdin);
+			if (strlen(pw) < 6) {
+				system("cls");
+				printf("密码至少设置6位:\n");
+				continue;
+			}
+			system("cls");
+			printf("请确认密码:\n");
+			fgets_nn(pw2, 17, stdin);
+			if (strcmp(pw, pw2)||(strlen(pw)!=strlen(pw2))) {
+				system("cls");
+				printf("密码确认错误,请重新设置密码:\n");
+				continue;
+			}
+			break;
+		}
+		fprintf(password, "%s", pw);
+		fclose(password);
+		system("cls");
+		return true;
+	}
+	char pw[17];
+	fgets_nn(pw, 17, password);
+	if (feof(password)) {
+		fclose(password);
+		system("attrib password -s -h -r");
+		remove("password");
+		return check_password();
+	}
+	printf("请输入密码:\n");
+	char pwi[17];
+	fgets_nn(pwi, 17, stdin);
+	system("cls");
+	if (!strcmp(pw, pwi))
+		return true;
+	else
+		return false;
+}
+bool load(void) {
+	FILE * data;
+	data = fopen("data", "r");
+	if (data == NULL)
+		return false;
+	student temp;
+	while (1) {
+		fgets_nn(temp.no, 21, data);
+		if (feof(data)){
+			break;
+		}
+		fgets_nn(temp.name, 11, data);
+		fscanf(data, "%hhu", &temp.fame);
+		fscanf(data, "%hd", &temp.age);
+		fgetc(data);//去除留下的\n
+		fgets_nn(temp.oth, 151, data);
+		creat(temp);
+		counts++;
+	}
+	fclose(data);
+	return true;
+}
+void fgets_nn(char *buffer, int max, FILE * file) {
+	fgets(buffer, max, file);
+	int i=0;
+	for (i = 0; i < max; i++) {
+		if (buffer[i] == '\n') {
+			buffer[i] = '\0';
+			return;
+		}
+	}
+}
+bool check_no(char * no) {
+	student *l = first;
+	while (l != NULL) {
+		if (strlen(l->no) == strlen(no) && !strcmp(l->no, no)) {
+			return false;
+		}
+		l = l->next;
+	}
+	return true;
+}