diff --git a/2209040028/THE test of student b/2209040028/THE test of student
new file mode 100644
index 0000000..8dd8390
--- /dev/null
+++ b/2209040028/THE test of student	
@@ -0,0 +1,173 @@
+void add_question(QuestionBank L)
+      {
+	question* p = L, * n = newQuestion();
+	int i;
+	printf("请输入问题：");
+	scanf("%s", n->que);
+	for (i = 0; i < 4; ++i)
+	{
+		printf("请输入选项%c：", i + 'A');
+		scanf("%s", n->options[i]);
+	}
+	while (getchar() != '\n');
+	printf("请输入正确选项（A、B、C、D中的一个）：");
+	scanf("%c", &n->answer);
+	printf("请输入本题分数：");
+	scanf("%f", &n->score);
+	while (p->next) p = p->next;
+	p->next = n;
+	printf("录入成功\n");
+      }
+
+3.2修改试题模块
+
+
+      void modify_question(QuestionBank L)
+      {
+	question* p = L->next;
+	int i = 0, choose;
+	while (p)
+	{
+		printf("%d. %s\n", i + 1, p->que);
+		p = p->next;
+		++i;
+	}
+	printf("%d. 返回主菜单\n", i + 1);
+	printf("请输入序号，选择要修改的试题：");
+	scanf("%d", &choose);
+	if (choose < 0 || choose >= i + 1)
+	{
+		if (choose != i + 1)
+			printf("输入错误，将返回主菜单\n");
+		return;
+	}
+	else
+	{
+		int j;
+		p = L;
+		for (i = 0; p->next && i < choose; ++i)
+			p = p->next;
+		printf("请输入问题：");
+		scanf("%s", p->que);
+		for (j = 0; j < 4; ++j)
+		{
+			printf("请输入选项%c：", j + 'A');
+			scanf("%s", p->options[j]);
+		} 
+		while (getchar() != '\n');
+		printf("请输入正确选项（A、B、C、D中的一个）：");
+		scanf("%c", &p->answer);
+		printf("请输入本题分数：");
+		scanf("%f", &p->score);
+		printf("修改成功\n");
+	}
+}
+
+
+3.3抽取试题模块
+
+
+        void extract_questions(QuestionBank L, QuestionBank TestPaper)
+        {
+	int N, n = 0; //N是总的抽题数，n是当前抽题数
+	int num = 0; //当前题目总数
+	printf("请输入要抽取的题目数量：");
+	scanf("%d", &N);
+	question* p = L;
+	while (p)
+	{
+		++num;
+		p = p->next;
+	}
+	if (N >= num)
+	{
+		printf("抽取题目数量大于当前已录入的题目数\n");
+		return;
+	}
+	printf("试题抽取中，请耐心等待.....\n");
+	while (n < N)
+	{
+		int i = 0, max_rand = 0;
+		question* p1 = L, * p2 = TestPaper;
+		srand(time(0) + i);
+		max_rand = rand() % num + 1;
+		while (i < max_rand)
+		{
+			p1 = p1->next;
+			++i;
+		}
+		if (!is_repeat(TestPaper, p1))
+		{
+			p1->nextQuestion = p2->nextQuestion;
+			p2->nextQuestion = p1;
+			++n;
+		}
+	}
+	printf("试卷生成成功\n");
+}
+界面展示：
+
+
+
+
+
+3.4答题模块
+
+void answer_questions(QuestionBank TestPaper)
+{
+	question* p = TestPaper->nextQuestion;
+	if (!p)
+		printf("当前还未生成试卷\n");
+	while (p)
+	{
+		char ans;
+		print_question(p);
+		while (getchar() != '\n');
+
+		scanf("%c", &ans);
+		if (ans == p->answer)
+		{
+			p->is_right = 1;
+			printf("恭喜答对\n");
+		}
+		else
+		{
+			p->is_right = 0;
+			printf("很遗憾，答错了\n");
+		}
+		p = p->nextQuestion;
+	}
+}
+
+界面展示：
+
+
+3.5评分模块
+
+void give_score(QuestionBank TestPaper)
+{
+	int r = 0, w = 0;
+	float score_r = 0, score_w = 0;
+	question* p = TestPaper->nextQuestion;
+	if (!p)
+	{
+		printf("请先生成试卷后答题，最后再来评分！\n");
+		return;
+	}
+	while (p)
+	{
+		if (p->is_right)
+		{
+			++r;
+			score_r += p->score;
+		}
+		else
+		{
+			++w;
+			score_w += p->score;
+		}
+		p = p->nextQuestion;
+	}
+	printf("本次共答了%d道题，其中答对%d道，答错%d道\n", r + w, r, w);
+	printf("总分：%.1f分，你的得分：%.1f分\n", score_r + score_w, score_r);
+}
diff --git a/2209040028/elective subject of study b/2209040028/elective subject of study
new file mode 100644
index 0000000..90e4e99
--- /dev/null
+++ b/2209040028/elective subject of study	
@@ -0,0 +1,304 @@
+#include <stdio.h>
+#include <stdlib.h>      // 主流程图：
+#include <string.h> 
+typedef struct subjects
+{
+ int num;
+ char name[20];
+ char kind[10];
+ int stime;
+ int ttime;
+ int etime;
+ int score;
+ int term;
+ struct subjects *next;
+}SUB;
+ 
+SUB *create_form()
+{
+ SUB *head,*tail,*p;
+ int num,stime,ttime;
+ int etime,score,term;
+ char name[20],kind[10];
+ int size=sizeof(SUB);
+head=tail=NULL;
+ 
+
+
+printf("输入选修课程信息:\n");
+ scanf("%d %s %s %d %d %d %d %d",&num,&name,&kind,&stime,&ttime,&etime,&score,&term);
+ while(num!=0){
+  p=(SUB *)malloc(size);
+  p->num=num;
+  strcpy(p->name,name);
+  strcpy(p->kind,kind);
+  p->stime=stime;
+  p->ttime=ttime;
+  p->etime=etime;
+  p->score=score;
+  p->term=term;
+ if(head==NULL)
+  head=p;
+ else
+  tail->next=p;
+ tail=p;
+ scanf("%d %s %s %d %d %d %d %d",&num,&name,&kind,&stime,&ttime,&etime,&score,&term);
+ }
+ tail->next=NULL;
+ return head;
+}
+ 
+void savefile(SUB *head)
+{
+ SUB *p;
+ FILE *fp;
+ fp=fopen("subjects.txt","w");
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+
+fprintf(fp,"课程编号  课程名称  课程性质  总学时  授课学时  实验或上机学时  学分  开课学期\n");
+ for(p=head;p;p=p->next)
+
+fprintf(fp,"%5d%12s%9s%9d%9d%11d%11d%7d\n",p->num,p->name,p->kind,p->stime,p->ttime,p->etime,p->score,p->term);
+ fclose(fp);
+}
+ 
+void savefileadd(SUB *head)
+{
+ SUB *p;
+ FILE *fp;
+ fp=fopen("subjectsadd.txt","w");
+ fprintf(fp,"课程编号  课程名称  课程性质  总学时  授课学时  实验或上机学时  学分  开课学期\n");
+ for(p=head;p;p=p->next)
+  fprintf(fp,"%5d%12s%9s%9d%9d%11d%11d%7d\n",p->num,p->name,p->kind,p->stime,p->ttime,p->etime,p->score,p->term);
+ fclose(fp);
+}
+ 
+void savefiledel(SUB *head)
+{
+ SUB *p;
+ FILE *fp;
+ fp=fopen("subjectsdel.txt","w");
+ fprintf(fp,"课程编号  课程名称  课程性质  总学时  授课学时  实验或上机学时  学分  开课学期\n");
+ for(p=head;p;p=p->next)
+  fprintf(fp,"%5d%12s%9s%9d%9d%11d%11d%7d\n",p->num,p->name,p->kind,p->stime,p->ttime,p->etime,p->score,p->term);
+ fclose(fp);
+}
+
+
+
+
+
+
+
+
+void prin(SUB *head)
+{
+ SUB *ptr;
+ if(head==NULL){
+  printf("没有此门课程记录!\n");
+  return;
+ }
+ printf("课程编号  课程名称  课程性质  总学时  授课学时  实践或上机学时  学分  开课学期\n");
+ for(ptr=head;ptr;ptr=ptr->next)
+  printf("%5d%12s%9s%9d%9d%11d%11d%7d\n",ptr->num,ptr->name,ptr->kind,ptr->stime,ptr->ttime,ptr->etime,ptr->score,ptr->term);
+}
+
+void search(SUB *head)
+{
+ int a,num;
+ int t=1;
+ char type[10];
+ char ch='a',ch1;
+ SUB *ptr;
+ 
+ 
+
+
+
+
+
+while(ch!=' '){
+  printf("若要按课程性质查找请输入1，若要按学分查找请输入2:\n");
+  scanf("%d",&a);
+  switch(a){
+  case 1:printf("请输入要查找的课程的性质:\n");
+   scanf("%s",type);
+   printf("课程编号  课程名称  课程性质  总学时  授课学时  实践或上机学时  学分  开课学期\n");
+   for(ptr=head;ptr;ptr=ptr->next)
+    if(strcmp(type,ptr->kind)==0){
+     
+
+
+
+
+printf("%5d%12s%9s%9d%9d%11d%11d%7d\n",ptr->num,ptr->name,ptr->kind,ptr->stime,ptr->ttime,ptr->etime,ptr->score,ptr->term);
+           t=0;
+    }
+    if(t) printf("未找到!\n");
+    t=1;
+   break;
+  case 2:printf("输入要查找的课程的学分\n");
+   scanf("%d",&num);
+   printf("课程编号  课程名称  课程性质  总学时  授课学时  实践或上机学时  学分  开课学期\n");
+   for(ptr=head;ptr;ptr=ptr->next)
+    if(ptr->score==num){
+     printf("%5d%12s%9s%9d%9d%11d%11d%7d\n",ptr->num,ptr->name,ptr->kind,ptr->stime,ptr->ttime,ptr->etime,ptr->score,ptr->term);
+                    t=0;
+    }
+    if(t) printf("未找到!\n");
+    t=1;
+  
+ }
+printf("继续查找请按回车键，结束请按空格键:\n");
+ ch1=getchar();                              //将回车键赋给CH1，否则CASE里面最后输入的回车键会赋给CH，因此用CH1填补。
+ ch=getchar();
+ }
+}
+ 
+SUB *insert(SUB *head)
+{
+ SUB *ptr,*ptr2,*subj;
+ int size=sizeof(SUB);
+ char ch='a',ch1;
+ while(ch!=' '){
+      subj=(SUB *)malloc(size);
+      ptr=subj;
+      printf("输入要插入的课程信息:\n");
+      scanf("%d%s%s%d%d%d%d%d",&subj->num,subj->name,subj->kind,&subj->stime,&subj->ttime,&subj->etime,&subj->score,&subj->term);
+       
+
+
+if(head==NULL){
+         head=ptr;
+         head->next=NULL;
+    }
+       else{
+          for(ptr2=head;ptr2;ptr2=ptr2->next)
+             if(ptr2->next==NULL){
+             ptr2->next=subj;
+             subj->next=NULL;
+             break;
+       }
+    }
+    printf("继续插入请按回车，结束请按空格:\n");
+    ch1=getchar();                      //将回车键赋给CH1，否则subj->term输完后输入的回车键会赋给CH，因此用CH1填补。
+    ch=getchar();
+    }
+ return head;
+}
+  
+SUB *del(SUB *head)
+{
+ SUB *p1,*p2;
+ char ch='a',ch1;
+ int num;
+ while(ch!=' '){
+  printf("输入想要删除的课程编号:\n");
+     scanf("%d",&num);
+     if(head->num==num){
+      p2=head;
+      head=head->next;
+      free(p2);
+  }
+     if(head==NULL)
+      return NULL;
+     p1=head;
+     p2=head->next;
+     
+
+
+
+
+
+
+while(p2){
+    if(p2->num==num){
+       p1->next=p2->next;
+       free(p2);
+    }
+     else p1=p2;
+     p2=p1->next;
+  }
+  printf("继续删除请按回车，结束请按空格:\n");
+  ch1=getchar();                       //将回车键赋给CH1，否则num输完后再输入的回车键会赋给CH，因此用CH1填补。
+  ch=getchar();
+ }
+ return head;
+}
+ 
+void choose(SUB *head)
+
+
+
+
+
+
+{
+ SUB *p,*q;
+ int a[5];
+ int num,total=0,i=0,j;
+ printf("输入要选修的课程的编号，编号之间以空格分开，输完后以0结束\n");
+scanf("%d",&num);
+ while(num!=0){
+  for(p=head;p;p=p->next)
+   if(p->num==num){
+    total=total+p->score;
+    a[i]=num;
+    i++;
+   }
+   scanf("%d",&num);
+ }
+ if(total<60) printf("选修总学分未达到60,选修失败!\n");
+ 
+
+
+
+else {
+  printf("选修成功!\n");
+  printf("您选修的课程为:\n");
+ for(j=0;j<i;j++)  
+
+    for(q=head;q;q=q->next)
+    if(q->num==a[j])
+    
+
+
+ printf("%s  ",q->name);
+ printf("\n");
+printf("***********************************\n");
+printf("***********************************\n");
+printf("***********************************\n");
+printf("***********************************\n");
+   
+    }
+}
+void main()
+{
+ SUB *head=create_form();
+ savefile(head);
+ prin(head);
+ search(head);
+ head=insert(head);//注意此处的必要性函数insert的的返回值重新赋给head!
+ savefileadd(head);
+ printf("修改后的信息为:\n");
+ prin(head);
+ head=del(head);       //注意此处的必要性，数del的的返回值重新赋给head!
+ savefiledel(head);
+ printf("修改后的课程信息为:\n");
+ prin(head);
+ choose(head);
+
+}
+