diff --git a/README.md b/README.md
index 5e55ea3..02615d7 100644
--- a/README.md
+++ b/README.md
@@ -480,5 +480,178 @@ scanf("%d",&changer1);
  }
  return 0;
 }
+步骤八
+#include<stdio.h>
+struct student{
+	int id;
+	int  class;
+	char name[20];
+	double score1;
+	double score2;
+	double score3;
+	double score;
+}stu[7];
+void xunwen(void){
+	printf("1.input\n");
+	printf("2.delet\n");
+	printf("3.select\n");
+	printf("4.order\n");
+	printf("5.output\n");
+	printf("6.quit\n");
+	printf("please input your option\n");
+}
+void input(void){
+	 int i,j;
+	 char str[3];
+	 void zhixing(void);
+	 for(i=0;i<7;i++){
+	 		printf("id ");
+	 		scanf("%d",&stu[i].id);
+	 		printf("class ");
+	 		scanf("%d",&stu[i].class);
+	 		printf("name ");
+	 		scanf("%s",stu[i].name);
+	 		printf("score1 ");
+	 		scanf("%lf",&stu[i].score1);
+	 		printf("score2 ");
+	 		scanf("%lf",&stu[i].score2);
+	 		printf("score3 ");
+	 		scanf("%lf",&stu[i].score3);
+	 		printf("continue?\n");
+	 		scanf("%s",str);
+	 		if(str[0]=='y')
+	 		continue;
+	 		else if(str[0]=='n')
+	 		break;
+	 		else
+			 return;
+	 }
+	 for(i=0;i<7;i++){
+	 	stu[i].score=stu[i].score1+stu[i].score2+stu[i].score3;
+	 }
+	 xunwen();
+	 zhixing();
+}
+void delet(struct student stu4[]){
+	void xunwen(void);
+	void zhixing(void);
+	 int i,j,k,a,b,c;
+	 char str[3];
+	 scanf("%d",&a);
+	 for(i=0;i<7;i++){
+	 	if(stu[i].id==a){
+          stu[i].id=0;
+		 }
+	 }
+	 for(i=0;i<7;i++){
+	 	if(stu[i].id!=0)
+	 	printf("%d %d %s %.1f %.1f %.1f %.1f %.1f\n",stu[i].id,stu[i].class,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score);
+	 }
+	 printf("continue?\n");
+	 struct student *p=stu;
+	 scanf("%s",str);
+	 if(str[0]=='y')
+	 delet(p);
+	 else if(str[0]=='n')
+	 xunwen();
+	 zhixing();
+}
+void select(struct student stu7[]){
+	 void xunwen(void);
+	 void zhixing(void);
+	 int i,j,k,a,b,c=1;
+	 char str[3];
+	 scanf("%d",&a);
+	 if(a>100){
+	 	for(i=0;i<7;i++){
+	 		if(stu7[i].id==a)
+	 		printf("%d %d %s %.1f %.1f %.1f %.1f\n",stu[i].id,stu[i].class,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score);
+	 		c=0;
+		 }
+	 }
+	 else if(a<100){
+	 	for(i=0;i<7;i++){
+	 		if(stu7[i].class==a){
+	 				printf("%d %d %s %.1f %.1f %.1f %.1f\n",stu[i].id,stu[i].class,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score);
+	 				c=0;
+			 }	
+	    }
+	 }
+	 if(c==1)
+	 printf("there is no eligible student");
+	 printf("continue?\n");
+	 struct student *p=stu;
+	 scanf("%s",str);
+	 if(str[0]=='y'){
+	 	select(p);
+	 }
+	 else if(str[0]=='n'){
+	 	xunwen();
+	 	zhixing();
+	 }
+}
+void order(struct student stu2[]){
+	void zhixing(void);
+	void output(void);
+     int i,j,k=0,a,b,c;
+     struct student temp;
+     struct student stu1[7];
+     for(i=0;i<7;i++){
+     	stu1[i]=stu2[i];
+	 }
+	 for(i=0;i<6;i++){
+	 	for(j=i+1;j<7;j++){
+	 		if(stu1[j].score>=stu1[i].score){
+	 			temp=stu1[i];
+	 			stu1[i]=stu1[j];
+	 			stu1[j]=temp;
+			 }
+		 }
+	 }
+	 for(i=1;i<30;i++){
+	 	for(j=0;j<7;j++){
+	 		if(stu1[j].class==i)
+	 		stu2[k++]=stu1[j];
+		 }
+	 }
+	 for(i=0;i<7;i++){
+	 	if(stu[i].id!=0){
+	 		printf("%d %s %d %.1f %.1f %.1f",stu[i].id,stu[i].class,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3);
+		 }
+	 } 
+	 xunwen();
+	 zhixing();
+}
+void output(){
+	void zhixing(void);
+	int i;
+	for(i=0;i<7;i++){
+		if(stu[i].id!=0)
+			printf("%d %d %s %.1f %.1f %.1f %.1f\n",stu[i].id,stu[i].class,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3,stu[i].score);
+	}
+	xunwen();
+	zhixing();
+}
+void quit(void){
+	return;
+} 
+void zhixing(void){
+	int i;
+	scanf("%d",&i);
+	struct student *p=stu;
+	 switch(i){
+    	case 1:input();break;
+    	case 2:delet(p);break;
+    	case 3:select(p);break;
+    	case 4:order(p);break;
+    	case 5:output();break;
+    	case 6:quit();break;
+	}
+}
+int main(){
+	xunwen();
+	zhixing();
+	return 0;
+}