diff --git a/删除学生信息、查询信息.c b/删除学生信息、查询信息.c
new file mode 100644
index 0000000..09128ff
--- /dev/null
+++ b/删除学生信息、查询信息.c
@@ -0,0 +1,136 @@
+void reduce()
+{
+	int i=0,j,k,id;
+	FILE *fp1,*fp2,*ff;
+	ff=fopen("b.txt","r");
+	fscanf(ff,"%d",&j);
+	close(ff);
+		if((fp1=fopen("a.txt","r"))==NULL)
+	{
+		printf("file open error");
+		exit(0);
+	}
+	printf("������Ҫɾ��ѧ����Ϣ��ѧ��\n");
+	scanf("%d",&id);
+	while(!feof(fp1))
+	{
+		fscanf(fp1,"%d%d%s%d%d%d%d",&student[i].id,&student[i].class,&student[i].name,&student[i].time_beginhour,&student[i].time_beginminute,&student[i].time_endhour,&student[i].time_endminute);
+		i++;
+		j=i;
+	}
+	fclose(fp1);
+	for(i=0;i<=j;i++)
+	{
+		if(student[i].id==id)
+		k=i;
+	}
+	fp2=fopen("a.txt","w");
+	if(k==0)
+	{
+		for(i=1;i<=j;i++)
+		fprintf(fp2,"%d%d%s%d%d%d%d",student[i].id,student[i].class,student[i].name,student[i].time_beginhour,student[i].time_beginminute,student[i].time_endhour,student[i].time_endminute);
+	}
+	if(k>0)
+	{
+	for(i=0;i<k;i++)
+	fprintf(fp2,"%d%d%s%d%d%d%d",student[i].id,student[i].class,student[i].name,student[i].time_beginhour,student[i].time_beginminute,student[i].time_endhour,student[i].time_endminute);
+	for(i=(k+1);i<=j;i++)
+	fprintf(fp2,"%d%d%s%d%d%d%d",student[i].id,student[i].class,student[i].name,student[i].time_beginhour,student[i].time_beginminute,student[i].time_endhour,student[i].time_endminute);
+    }
+	fclose(fp2);
+	ff=fopen("b.txt","w");
+	fprintf(ff,"%d",j-1);
+	fclose(ff);
+	printf("ɾ���ɹ�");
+}
+void classfind()
+{
+	FILE *fp;
+	int class,i=0,j;
+		if((fp=fopen("a.txt","r"))==NULL)
+	{
+		printf("file open error");
+		exit(0);
+	}
+	printf("������Ҫ���ҵİ༶\n");
+	scanf("%d",&class);
+	while(!feof(fp))
+	{
+		fscanf(fp,"%d%d%s%d%d%d%d",&student[i].id,&student[i].class,&student[i].name,&student[i].time_beginhour,&student[i].time_beginminute,&student[i].time_endhour,&student[i].time_endminute);
+		i++;
+		j=i;
+	}
+	for(i=0;i<=j;i++)
+	{
+	if(student[i].class==class)
+	{
+	printf("ѧ�ţ�%d\n",student[i].id);
+	printf("�༶��%d\n",student[i].class);
+	printf("������%s\n",student[i].name);
+	printf("��ʼ�ϻ�ʱ�䣻%d:%d\n",student[i].time_beginhour,student[i].time_beginminute);
+	printf("�����ϻ�ʱ�䣻%d:%d\n",student[i].time_endhour,student[i].time_endminute);
+    }
+    }
+	fclose(fp);
+}
+void idfind()
+{
+	int id,i=0,j;
+	FILE *fp; 
+		if((fp=fopen("a.txt","r"))==NULL)
+	{
+		printf("file open error");
+		exit(0);
+	}
+	printf("������Ҫ���ҵ�ѧ��\n");
+	scanf("%d",&id);
+	while(!feof(fp))
+	{
+		fscanf(fp,"%d%d%s%d%d%d%d",&student[i].id,&student[i].class,&student[i].name,&student[i].time_beginhour,&student[i].time_beginminute,&student[i].time_endhour,&student[i].time_endminute);
+		i++;
+		j=i;
+	}
+	for(i=0;i<=j;i++)
+	{
+	if(student[i].id==id)
+	{
+	printf("ѧ�ţ�%d\n",student[i].id);
+	printf("�༶��%d\n",student[i].class);
+	printf("������%s\n",student[i].name);
+	printf("��ʼ�ϻ�ʱ�䣻%d:%d\n",student[i].time_beginhour,student[i].time_beginminute);
+	printf("�����ϻ�ʱ�䣻%d:%d",student[i].time_endhour,student[i].time_endminute);
+    }
+    }
+	fclose(fp);
+}
+void namefind()
+{
+	FILE *fp;
+	int i=0,j;
+	char name[10];
+		if((fp=fopen("a.txt","r"))==NULL)
+	{
+		printf("file open error");
+		exit(0);
+	}
+	printf("������Ҫ���ҵ�����\n");
+	scanf("%s",&name);
+	while(!feof(fp))
+	{
+		fscanf(fp,"%d%d%s%d%d%d%d",&student[i].id,&student[i].class,&student[i].name,&student[i].time_beginhour,&student[i].time_beginminute,&student[i].time_endhour,&student[i].time_endminute);
+		i++;
+		j=i;
+	}
+	for(i=0;i<=j;i++)
+	{
+	if(strcmp(student[i].name,name)==0)
+	{
+	printf("ѧ�ţ�%d\n",student[i].id);
+	printf("�༶��%d\n",student[i].class);
+	printf("������%s\n",student[i].name);
+	printf("��ʼ�ϻ�ʱ�䣻%d:%d\n",student[i].time_beginhour,student[i].time_beginminute);
+	printf("�����ϻ�ʱ�䣻%d:%d",student[i].time_endhour,student[i].time_endminute);
+    }
+    }
+	fclose(fp);
+}