diff --git a/任务七.c b/任务七.c
new file mode 100644
index 0000000..f3a191d
--- /dev/null
+++ b/任务七.c
@@ -0,0 +1,179 @@
+#include<stdio.h>
+#include<string.h>
+int i=0;
+struct data
+	{
+		char num[10];
+		char clas[10];
+		char name[20];
+		float grade1;
+		float grade2;
+		float grade3;
+		float total;
+	}; 
+	struct data stu[100];
+int main()
+{
+    void menu();
+    menu();
+ } 
+void print(struct data a)
+{
+	printf("%s %s %s %3.1f %3.1f %3.1f %3.1f",a.num,a.clas,a.name,a.grade1,a.grade2,a.grade3,a.grade1+a.grade2+a.grade3);
+}
+void menu()
+{   
+    void input();
+    void delet();
+    void select();
+    void order();
+    void output();
+	printf("                              1.input\n");
+	printf("                              2.delete\n");
+	printf("                              3.select\n");
+	printf("                              4.order\n");
+	printf("                              5.output\n");
+	printf("                              6.quit\n");
+	printf("please input your option\n");
+	int a;
+	scanf("%d",&a);
+	if(a==1)
+	{
+		input();
+	}
+	else if(a==2)
+	{
+		delet();
+	}
+	else if(a==3)
+	{
+		select();
+	}
+	else if(a==4)
+	{
+		order();
+	}
+	else if(a==5)
+	{
+		output();
+	}
+	else printf("\n");
+	
+	
+ }
+void input()
+{
+	void menu();
+	char a[5];
+    printf("Id ");
+    scanf("%s",stu[i].num);
+    printf("class ");
+    scanf("%s",stu[i].clas);
+    printf("name ");
+    scanf("%s",stu[i].name);
+    printf("score1 ");
+	scanf("%f",&stu[i].grade1);
+	printf("score2 ");
+	scanf("%f",&stu[i].grade2);
+	printf("score3 ");
+	scanf("%f",&stu[i].grade3);
+	stu[i].total=stu[i].grade1+stu[i].grade2+stu[i].grade3;
+	printf("continue?(yes or no)\n");
+	scanf("%s",a);
+	if(strcmp(a,"yes")==0)
+	{
+		i++;
+		input();
+	}
+	else menu();	
+ } 
+ void delet()
+ {
+ 	void menu();
+ 	char a[10];
+ 	char b[10];
+ 	printf("请输入要删除的学生学号或者姓名 ");
+	scanf("%s",a);
+	struct data temp;
+	for(int j=0;j<i+1;j++)
+	{
+		if(strcmp(a,stu[j].num)==0||strcmp(a,stu[j].name)==0)
+		{
+			stu[j]=stu[i];
+			i--;
+		}
+		if(i==0) break;
+	 } 
+	printf("continue?(yes or no)\n");
+	scanf("%s",b);
+	if(strcmp(b,"yes")==0&&i!=0)
+	delet();
+	else menu();
+}
+void select()
+{
+	void menu();
+	void print(struct data a);
+	char a[10];
+	char b[10];
+	printf("请输入要查询的学生的学号或班级 ");
+	scanf("%s",a);
+	for(int j=0;j<i+1;j++)
+	{
+		if(strcmp(stu[j].num,a)==0||strcmp(stu[j].clas,a)==0)
+		print(stu[j]);
+        printf("\n");
+	 } 
+	printf("continue?(yes or no)\n");
+	scanf("%s",b);
+    if(strcmp(b,"yes")==0&&i!=0)
+    select();
+    else menu();
+	
+}
+void order()
+{
+	struct data temp;
+	void menu();
+    for(int j=0;j<i+1;j++)
+    {
+    	for(int p=j+1;p<i+1;p++)
+    	{
+    		if(strcmp(stu[j].clas,stu[p].clas)>0)
+    		{
+    			temp=stu[j];
+    			stu[j]=stu[p];
+    			stu[p]=temp;
+			}
+		}
+	}
+	for(int j=0;j<i+1;j++)
+	{
+		for(int p=j+1;p<i+1;p++)
+		{
+			if(stu[j].total<stu[p].total&&strcmp(stu[j].clas,stu[p].clas)==0)
+			{
+				temp=stu[j];
+    			stu[j]=stu[p];
+    			stu[p]=temp;
+			}
+		}
+	}
+	for(int j=0;j<i+1;j++)
+	{
+		print(stu[j]);
+		printf("\n");
+	}
+	menu();
+}
+void output()
+{
+	void print(struct data a);
+	void menu();
+	for(int j=0;j<i+1;j++)
+	{
+		print(stu[j]);
+		printf("\n");
+	}
+	menu();
+}