diff --git a/README.md b/README.md
index 1af57ae..51d6a71 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ int main()
 		printf("%d %.1f %.1f %.1f %.1f\n",num[i],math[i],physic[i],english[i],sum[i]);
 	}	
 }
+
 步骤3
 int main()
 {
@@ -204,7 +205,7 @@ for(int j=0;j<n;j++){
 
  } 
  步骤五
- #include <stdio.h>
+#include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 int num[4],cla[4];
@@ -286,7 +287,8 @@ n=m+1;
 sta=0;begin=sta;
 sort(add);
 n=3;
-	scanf("delete");
+	//scanf("delete");
+	printf("请输入要删除的学生信息（学号或姓名）\n");
 	scanf("%s",name[3]);
 	int exist=0,target;
 	if(name[3][0]>='0'&&name[3][0]<='9') 
@@ -294,7 +296,7 @@ n=3;
 		int number=atoi(name[3]);
 		for(int i=0;i<3;i++){
 			if(number==num[i]){
-				printf("Are you sure?");
+				printf("Are you sure(yes)?\n");
 				exist=1;
 				target=i;
 				break;
@@ -306,7 +308,7 @@ n=3;
 		for(int i=0;i<3;i++){
 			if(strcmp(name[i],name[3]));
 			else{
-				printf("Are you sure?\n");
+				printf("Are you sure(yes)?\n");
 				exist=1;
 				target=i;
 				break;
@@ -335,134 +337,66 @@ n=3;
 		}
 	}
 	return 0;	
- } 
+ }
 步骤六
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-int num[4],cla[4];
-float f[4],s[4],t[4],add[4];
-int begin,sta;
-int n=3;
-int insert;
-char name[4][10]={{"Zhang"},{"Yang"},{"Liang"}};
-void sort(float add[])
-{
-	int i,j,te;
-	float zh;
-	char oo[10];
-	for(i=n-1;i>sta;i--)
-	{
-		if(add[i]>add[i-1])
-		{
-			zh=add[i];add[i]=add[i-1];add[i-1]=zh;
-			te=num[i];num[i]=num[i-1];num[i-1]=te;
-			zh=f[i];f[i]=f[i-1];f[i-1]=zh;
-			zh=s[i];s[i]=s[i-1];s[i-1]=zh;
-			zh=t[i];t[i]=t[i-1];t[i-1]=zh;
-			strcpy(oo,name[i]);strcpy(name[i],name[i-1]);
-			strcpy(name[i-1],oo); 
-		}
+#include<stdio.h>
+struct Scoreb{
+	int schoolnumber;
+	int classnumber;
+	char name[20];
+	float math;
+	float physics;
+	float english;
+	float sum;
+};
+int main(){ 
+struct Scoreb student1={10001,11,"Zhang",99.5,88.5,89.5,277.5};
+    struct Scoreb student2={10002,12,"Yang",77.9,56.5,87.5,221.9};
+	struct Scoreb student3={10003,11,"Liang",92.5,99.0,60.5,252};	
+	struct Scoreb students[3] = {student1,student2,student3};
+	
+	struct Scoreb schange;
+	scanf("%d%d%s%f%f%f",&schange.schoolnumber,&schange.classnumber,&schange.name,&schange.math,&schange.physics,&schange.english);int c=schange.schoolnumber;
+	for(int i=0;i<3;i++){
+		if(schange.schoolnumber==students[i].schoolnumber){
+			schange.sum = schange.math+schange.physics+schange.english;
+			students[i]=schange;
+		}	
 	}
-	if(n!=sta+1)
-	 {
-	sta++; 
-	sort(add);}
-}
 
-void div(int clas[])
-{
-	int i,j,te;
-	float zh;
-	char oo[10];
-	for(i=0;i<n-1;i++)
-	{
-		if(clas[i]>clas[i+1])
-		{
-			te=clas[i];clas[i]=clas[i+1];clas[i+1]=te;
-			zh=add[i];add[i]=add[i+1];add[i+1]=zh;
-			te=num[i];num[i]=num[i+1];num[i+1]=te;
-			zh=f[i];f[i]=f[i+1];f[i+1]=zh;
-			zh=s[i];s[i]=s[i+1];s[i+1]=zh;
-			zh=t[i];t[i]=t[i+1];t[i+1]=zh;
-			strcpy(oo,name[i]);strcpy(name[i],name[i+1]);
-			strcpy(name[i+1],oo); 
+	for(int j = 0 ; j < 3 ; j++)
+		for(int k = 2; k > j;k--){
+			if(students[k].classnumber <students[k-1].classnumber){
+				struct Scoreb temp1 = students[k-1];
+				students[k-1] = students[k];
+				students[k] = temp1;
+			
+			}else if(students[k].classnumber == students[k-1].classnumber){
+				if(students[k].sum>students[k-1].sum){
+				struct Scoreb temp2 = students[k-1];
+				students[k-1] = students[k];
+				students[k] = temp2;
+				}
+			}
 		}
+	 
+	for(int i = 0; i < 2 ; i++){
+		printf("%d %d %s %.1f %.1f %.1f ",students[i].classnumber,students[i].schoolnumber,students[i].name,students[i].math,students[i].physics,students[i].english);
+		if(c==students[i].schoolnumber)
+		printf("modified\n");
+		if(students[0].classnumber==students[1].classnumber)
+		{
+		printf("   %d %s %.1f %.1f %.1f\n",students[1].schoolnumber,students[1].name,students[1].math,students[1].physics,students[1].english);break;}
 	}
-	if(n!=sta+1){
-		n--;
-	div(clas);}
+	printf("%d %d %s %.1f %.1f %.1f\n",students[2].classnumber,students[2].schoolnumber,students[2].name,students[2].math,students[2].physics,students[2].english);
+	if(c==students[2].schoolnumber)
+	printf(" modified");
+	return 0; 
 
 }
- 
 
-int main()
-{
-void sort(float add[]);
-void div(int clas[]);
-num[0]=10001;num[1]=10002;num[2]=10003;
-cla[0]=11;cla[1]=12;cla[2]=11;
-f[0]=99.5;f[1]=77.9;f[2]=92.5;
-s[0]=88.5;s[1]=56.5;s[2]=99.0;
-t[0]=89.5;t[1]=87.5;t[2]=60.5;
-sta=0;begin=0;
-div(cla); 
-n=3;
-int m;
-for(m=0;m<n;m++){
-	if(cla[m]!=cla[m+1])
-		break;
-}
-sta=m;begin=sta;
-sort(add);
-n=m+1;
-sta=0;begin=sta;
-sort(add);
-n=3;
-int i;
-int changer1,changer2,target,input;
-float changer4,changer5,changer6;
-scanf("%d",&changer1); 
- for(i=0;i<3;i++){
- 	if(num[i]==changer1){input=1;break;}
- 	else input=0;
- }
- char changer[10]; 
- scanf("%d",&changer2);
- scanf("%s",changer);
- scanf("%f",&changer4);
- scanf("%f",&changer5);
- scanf("%f",&changer6);
- if(input==0){
- 	for(i=0;i<3;i++){
- 		printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);
-	 }
- }
- else
- {
- 	i=target;
- 	cla[i]=changer2;strcpy(name[i],changer);f[i]=changer4;
- 	s[i]=changer5;t[i]=changer6;
- 	sta=0;begin=0;
-	div(cla);
-	n=3;
-	int m;
-	for(m=0;m<n;m++){
-		if(cla[m]!=cla[m+1])
-			break;
-	}
-	sta=m;begin=sta;
-	sort(add);
-	n=m+1;
-	sta=0;begin=sta;
-	sort(add);
-	for(i=0;i<3;i++){
- 		printf("%d %d %s %.2f %.2f %.2f\n",num[i],cla[i],name[i],f[i],s[i],t[i]);
-	 }
- 	
- }
- return 0;
-}
+步骤七
+
 步骤八
 #include<stdio.h>
 #include<string.h>