diff --git a/8.cpp b/8.cpp
deleted file mode 100644
index ae23f68..0000000
--- a/8.cpp
+++ /dev/null
@@ -1,200 +0,0 @@
-#include <stdio.h>
-#include <time.h>
-#include <stdlib.h>
-#include <string.h>
-void input();
-void delete1();
-void select();
-void order();
-void output();
-void output1();
-void quit();
-void menu();
-int sum=0;
-
-struct stu
-{
-	int Id;
-	int clas;
-	char name[100];
-	float score1;
-	float score2;
-	float score3;
-	float score;
-}stu[1000];
-int main()
-{
-	while(1)
-	{
-		menu();
-	}
-}
-void menu()
-{
-	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 t;
-	scanf("%d",&t);
-	switch(t)
-	{
-		case 1:input();break;
-		case 2:delete1();break;
-		case 3:select();break;
-		case 4:order();break;
-		case 5:output();break;
-		case 6:quit();break;
-	}	
-}
-void input()
-{
-	sum=sum+1;
-	printf("Id ");
-	scanf("%d",&stu[sum].Id);
-	printf("class ");
-	scanf("%d",&stu[sum].clas);
-	printf("name ");
-	scanf("%s",&stu[sum].name);
-	printf("score1 ");
-	scanf("%f",&stu[sum].score1);
-	printf("score2 ");
-	scanf("%f",&stu[sum].score2);
-	printf("score3 ");
-	scanf("%f",&stu[sum].score3);
-	stu[sum].score=stu[sum].score3+stu[sum].score2+stu[sum].score1;
-	printf("continue?\n");
-	char a[10];
-	scanf("%s",&a);
-	if(a[0]=='y'&&a[1]=='e'&&a[2]=='s')
-	{
-		input();
-	}
-	else if(a[0]=='n'&&a[1]=='o')
-	{
-		menu();
-	}
-}
-void delete1()
-{
-	printf("please input the id or name of the deleted person\n");
-	char b[100];
-	scanf("%s",&b);
-	int c=-56356,f=1,len1,len=strlen(b);
-	if(b[0]>'0'&&b[0]<'0')
-	{
-		for(int k=0;k<len;k++)
-		{
-			c=c*10+b[k]-'0';
-		}
-	}
-	if(sum>1)
-	{
-		for(int i=1;i<=sum;i++)
-		{
-			f=1;
-			len1=strlen((stu[i].name));
-			for(int x=0;x<len1;x++)
-			{
-				if(stu[i].name[x]!=b[x])
-				{
-					f=0;
-				}
-			}
-			if(stu[i].Id==c||f)
-			{
-				for(int j=i;j<=sum;j++)
-				{
-					stu[j]=stu[j+1];
-					sum=sum-1;
-				}
-			}
-		}
-	}
-	else
-	{
-		printf("number of people cannot be 0\n");
-		menu();
-	}
-	output1();
-	printf("continue?\n");
-	char a[10];
-	scanf("%s",&a);
-	if(a[0]=='y'&&a[1]=='e'&&a[2]=='s')
-	{
-		delete1();
-	}
-	else if(a[0]=='n'&&a[1]=='o')
-	{
-		menu();
-	}
-}
-void select()
-{
-	int b;
-	scanf("%d",&b);
-	for(int i=1;i<=sum;i++)
-	{
-		if(stu[i].Id==b||stu[i].clas==b)
-		{
-			printf("%d %d %s %.1f %.1f %.1f %.1f\n",stu[i].Id,stu[i].clas,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score) ;
-		}
-	}
-	char a[10];
-	scanf("%s",&a);
-	if(a[0]=='y'&&a[1]=='e'&&a[2]=='s')
-	{
-		select();
-	}
-	else if(a[0]=='n'&&a[1]=='o')
-	{
-		menu();
-	}
-}
-void order()
-{
-	for(int i=1;i<=sum;i++)
-	{
-		for(int j=i;j<=sum;j++)
-		{
-			if(stu[i].clas>stu[j].clas)
-			{
-				stu[sum+1]=stu[i];
-				stu[i]=stu[j];
-				stu[j]=stu[sum+1];
-			}
-			else if(stu[i].clas==stu[j].clas)
-			{
-				if(stu[i].Id>stu[j].Id)
-				{
-					stu[sum+1]=stu[i];
-					stu[i]=stu[j];
-					stu[j]=stu[sum+1];
-				}
-			}
-		}
-	}
-}
-void output()
-{
-	for(int i=1;i<=sum;i++)
-	{
-		printf("%d %d %s %.1f %.1f %.1f %.1f\n",stu[i].Id,stu[i].clas,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score);
-	}
-	menu();	
-}
-void output1()
-{
-	for(int i=1;i<=sum;i++)
-	{
-		printf("%d %d %s %.1f %.1f %.1f %.1f\n",stu[i].Id,stu[i].clas,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score);
-	}
-}
-void quit()
-{
-	exit(0);
-}
-