diff --git a/7.cpp b/7.cpp
new file mode 100644
index 0000000..c5d083b
--- /dev/null
+++ b/7.cpp
@@ -0,0 +1,175 @@
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+void a1();
+void a2();
+void a3();
+void a4();
+void a5();
+void menu();
+int sum=7;
+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},
+{10004,11,"Cai",89.6,56.9,90.5},
+{10005,14,"Fu",55.6,67.9,98.9},
+{10006,12,"Mao",22.1,45.9,99.2},
+{10007,13,"Zhan",35.6,67.9,88.0}};
+int main()
+{
+	while(1)
+	{
+		menu();
+	}
+}
+void menu()
+{
+	int t;
+	scanf("%d",&t);
+	switch(t)
+	{
+		case 1:a1();break;
+		case 2:a2();break;
+		case 3:a3();break;
+		case 4:a4();break;
+		case 5:a5();break;
+	}	
+}
+void a1()
+{
+	char b[1000];
+	int x1=0,x2=0,len,i=0;
+	gets(b);
+	len=strlen(b);
+	while(b[i]!='-')
+	{
+		i=i+1;
+	}
+	for(int j=1;j<i;j++)
+	{
+		x1=x1*10+b[j]-'0';
+	}
+	for(int j=i+1;j<len;j++)
+	{
+		x2=x2*10+b[j]-'0';
+	}
+	for(int k=x1;k<=x2;k++)
+	{
+		for(int j=0;j<sum;j++)
+		{
+			if(stu[j].clas==k)
+			{
+				printf("%d %d %s %.1f %.1f %.1f\n",stu[j].Id,stu[j].clas,stu[j].name,stu[j].score1,stu[j].score2,stu[j].score3);
+			}
+		}
+	}
+}
+void a2()
+{
+	char b[1000];
+	int x1=0,x2=0,len,i=0;
+	gets(b);
+	len=strlen(b);
+	while(b[i]!='-')
+	{
+		i=i+1;
+	}
+	for(int j=1;j<i;j++)
+	{
+		x1=x1*10+b[j]-'0';
+	}
+	for(int j=i+1;j<len;j++)
+	{
+		x2=x2*10+b[j]-'0';
+	}
+	for(int k=x1;k<=x2;k++)
+	{
+		for(int j=0;j<sum;j++)
+		{
+			if(stu[j].Id==k)
+			{
+				printf("%d %d %s %.1f %.1f %.1f\n",stu[j].Id,stu[j].clas,stu[j].name,stu[j].score1,stu[j].score2,stu[j].score3);
+			}
+		}
+	}
+}
+void a3()
+{
+	char b[100];
+	int len,f;
+	gets(b);
+	len=strlen(b)-1;
+	for(int i=0;i<sum;i++)
+	{
+		f=1;
+		for(int j=1;j<len;j++)
+		{
+			if(stu[i].name[j-1]!=b[j])
+			{
+				f=0;
+			}
+		}
+		if(f==1)
+		{
+			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);
+		}
+	}
+}
+void a4()
+{
+	int a;
+	scanf("%d",&a);
+	for(int i=0;i<sum;i++)
+	{
+		if(stu[i].score1+stu[i].score2+stu[i].score3>a)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);
+	}
+}
+void a5()
+{
+	char b[1000];
+	int x1=0,x2=0,x3=0,len,t,i=0;
+	gets(b);
+	len=strlen(b);
+	while(b[i]!='.')
+	{
+		i=i+1;
+	}
+	t=i+1;
+	for(int j=1;j<i;j++)
+	{
+		x1=x1*10+b[j]-'0';
+	}
+	while(b[i]!='-')
+	{
+		i=i+1;
+	}
+	for(int j=t;j<i;j++)
+	{
+		x2=x2*10+b[j]-'0';
+	}
+	for(int j=i+1;j<len;j++)
+	{
+		x3=x3*10+b[j]-'0';
+	}
+	for(int k=x2;k<=x3;k++)
+	{
+		for(int j=0;j<sum;j++)
+		{
+			if(stu[j].Id==k&&stu[j].clas==x1)
+			{
+				printf("%d %d %s %.1f %.1f %.1f\n",stu[j].Id,stu[j].clas,stu[j].name,stu[j].score1,stu[j].score2,stu[j].score3);
+			}
+		}
+	}
+	
+}