diff --git a/5.cpp b/5.cpp
new file mode 100644
index 0000000..5f3866b
--- /dev/null
+++ b/5.cpp
@@ -0,0 +1,110 @@
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+void delete1();
+void order();
+void output();
+int sum=2;
+struct stu
+{
+	int Id;
+	int clas;
+	char name[100];
+	float score1;
+	float score2;
+	float score3;
+	float score;
+}stu[100]={{10001,11,"Zhang",99.5,88.5,89.5,277.5},
+{10002,12,"Yang",77.9,56.5,87.5,221.9},
+{10003,11,"Liang",92.5,99.0,60.5,252}};
+int main()
+{
+	while(1)
+	{
+		order();
+		output();
+		delete1(); 
+	}
+}
+void delete1()
+{
+	char b[100];
+	scanf("%s",&b);
+	int c=-56356,f=1,len1,len=strlen(b);
+	if(b[0]>'0'&&b[0]<'9')
+	{
+		c=0;
+		for(int k=0;k<len;k++)
+		{
+			c=c*10+b[k]-'0';
+		}
+	}
+	printf("Are you sure(yes/no)?\n");
+	char a,t;
+	t=getchar();
+	a=getchar();
+	if(a=='y')
+	{
+		for(int i=0;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 if(a=='n')
+	{
+		output();
+		exit(0);
+	}
+	output();
+	exit(0);
+}
+void order()
+{
+	for(int i=0;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].score<stu[j].score)
+				{
+					stu[sum+1]=stu[i];
+					stu[i]=stu[j];
+					stu[j]=stu[sum+1];
+				}
+			}
+		}
+	}
+}
+void output()
+{
+	for(int i=0;i<=sum;i++)
+	{
+		printf("%d %d %s %.1f %.1f %.1f \n",stu[i].Id,stu[i].clas,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3);
+	}
+}
+
+