diff --git a/task6.cpp b/task6.cpp
new file mode 100644
index 0000000..26bff94
--- /dev/null
+++ b/task6.cpp
@@ -0,0 +1,171 @@
+#include <stdio.h>
+#include <string.h>
+
+//定义结构体
+struct Student
+{
+	int ID;//学号 
+	int classes;
+	char name[8];
+	float math_grade;
+	float physics_grade;
+	float English_grade;
+	float sum;
+};
+
+//对结构体中的从start同学到end同学排序
+void Sort(struct Student information[4],int start,int end)
+{
+	//先班级 
+	for(int i=start;i<=end;i++)
+	{
+		for(int j=start;j<=end-1;j++)
+		{
+			if(information[j].classes>information[j+1].classes)
+			{
+				struct Student tmp=information[j];
+				information[j]=information[j+1];
+				information[j+1]=tmp;
+			}
+		}
+	}
+	//同班同学再成绩 
+	for(int i=start;i<=end;i++)
+	 {
+	 	int con=0;//记录连续了几人 
+	 	for(int j=1;j<=end-i;j++)
+	 	{
+	 		if(information[i].classes==information[i+j].classes)
+	 		{con++;
+			 }
+			 else
+			 {
+			 break;
+			 }
+		 }
+			 
+		 if(con)//有人是同班同学，在此内排序 
+		 {
+		 	for(int m=i;m<i+con;m++)
+			{
+				for(int n=i;n<=i+con-1;n++)
+				{
+					if(information[n].sum<information[n+1].sum)
+			 		{
+						struct Student tmp=information[n];
+						information[n]=information[n+1];
+						information[n+1]=tmp;
+					 }
+				 }
+			 }
+		 }	 
+		 i=i+con;
+	  } 
+}
+
+//对非同班同学的打印输出 
+void output(struct Student information[4],int i)
+{
+	printf("%d %d ",information[i].classes,information[i].ID);
+	for(int j=0;information[i].name[j]!='\0';j++)
+	{
+		printf("%c",information[i].name[j]);
+	}
+	printf(" %.1f %.1f %.1f ",information[i].math_grade,\
+	information[i].physics_grade,information[i].English_grade);
+}
+
+//输出modified 
+void out_modified(struct Student information[4],struct Student delete_student,int i)
+{
+	if(delete_student.ID==information[i].ID)
+	{
+		printf("modified");
+	}
+	printf("\n");
+}
+int main()
+{
+	struct Student information[4];
+	information[0].ID=10001;strcpy(information[0].name, "Zhang");
+	information[0].classes=11;information[0].math_grade=99.5;
+	information[0].physics_grade=88.5;information[0].English_grade=89.5;
+	information[0].sum=99.5+88.5+89.5;
+	
+	information[1].ID=10002;strcpy(information[1].name, "Yang");
+	information[1].classes=12;information[1].math_grade=77.9;
+	information[1].physics_grade=56.5;information[1].English_grade=87.5;
+	information[1].sum=77.9+56.5+87.5;
+	
+	information[2].ID=10003;strcpy(information[2].name, "Liang");
+	information[2].classes=11;information[2].math_grade=92.5;
+	information[2].physics_grade=99.0;information[2].English_grade=60.5;
+	information[2].sum=92.5+99.0+60.5;
+	
+
+	//输入待修改同学的信息 
+	struct Student delete_student;
+	scanf("%d %d %s %f %f %f", &delete_student.ID,\
+	&delete_student.classes,&delete_student.name,&delete_student.math_grade,\
+	&delete_student.physics_grade,&delete_student.English_grade);
+	
+    delete_student.sum=delete_student.math_grade+delete_student.physics_grade\
+	+delete_student.English_grade;
+
+	for(int i=0;i<=2;i++)
+	{
+	  	if(delete_student.ID==information[i].ID)
+	  	{
+	  	information[i]=delete_student;
+	  	break;
+		}
+	}
+
+	//排序 
+	Sort(information,0,2);
+	for(int i=0;i<=2;i++)
+	 {
+	 	int con=0;//记录连续了几人 
+	 	for(int j=1;j<=2-i;j++)
+	 	{
+	 		if(information[i].classes==information[i+j].classes)
+	 		{con++;
+			 }
+			 else
+			 {
+			 break;
+			 }
+		 }
+			 
+		 if(con)//有人是同班同学，在此内排序 
+		 {
+			for(int m=i;m<=i+con;m++)
+			{
+				if(m==i)
+				{
+					printf("%d ",information[i].classes);
+				}
+				else
+				{
+					printf("   ");
+				}	
+				printf("%d ",information[m].ID);
+				for(int n=0;information[m].name[n]!='\0';n++)
+				{
+					printf("%c",information[m].name[n]);
+				}
+				printf(" %.1f %.1f %.1f ",information[m].math_grade,\
+				information[m].physics_grade,information[m].English_grade);
+				out_modified(information,delete_student,m);
+			}
+		 }
+		 else
+		 {
+		 	output(information,i);
+		 	out_modified(information,delete_student,i);
+		}	 
+		 i=i+con;
+	  } 
+	
+}
+