diff --git a/step7 b/step7
new file mode 100644
index 0000000..f3d43fa
--- /dev/null
+++ b/step7
@@ -0,0 +1,99 @@
+//program7 
+#include <stdio.h>
+struct student{
+int id;
+int Class;
+	char name[50];
+	float gs;
+	float dw;
+	float yy;
+}Stu[7]={
+{10001,11,"Zhang",99.5,88.5,89.5},
+{10002,12,"Yang",77.9,56.5,87.5},
+{10003,11,"Liang",92.5,99.0,60.5},
+{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}
+};//定义初始数据
+void type1()
+{
+	int a,b;
+	scanf("%d-%d",&a,&b);
+	for(int i=0;i<7;i++)
+	{
+		if(Stu[i].Class>=a&&Stu[i].Class<=b)
+		{
+			printf("%d %d %s %.1f %.1f %.1f\n",Stu[i].id,Stu[i].Class,Stu[i].name,Stu[i].gs,Stu[i].dw,Stu[i].yy);
+		}
+	}
+}//类型一 选择班级
+void type2()
+{
+	int a,b;
+	scanf("%d-%d",&a,&b);
+
+	for(int i=0;i<7;i++)
+	{
+		if(Stu[i].id>=a&&Stu[i].id<=b)
+		{
+			printf("%d %d %s %.1f %.1f %.1f\n",Stu[i].id,Stu[i].Class,Stu[i].name,Stu[i].gs,Stu[i].dw,Stu[i].yy);
+		}
+	}
+ } //类型二 选择学号
+ void type3()
+ {
+ 	char a[10];
+ 	scanf("%s",a);
+	 
+	 for(int j=0;j<7;j++)
+	 {
+	 	int n=0;
+	 	while(a[n]!='*'&&Stu[j].name[n]==a[n])
+	 	{
+	 		n++;
+		 }
+		 if(a[n]=='*')
+		 {
+		 	printf("%d %d %s %.1f %.1f %.1f\n",Stu[j].id,Stu[j].Class,Stu[j].name,Stu[j].gs,Stu[j].dw,Stu[j].yy);
+		 }
+	 }
+  } //类型三 选择姓名 
+  void type4()
+  {
+  	float a;
+  	scanf("%f",&a);
+  	for(int i=0;i<7;i++)
+  	{
+  		if(a<=Stu[i].dw+Stu[i].gs+Stu[i].yy)
+  		{
+  			printf("%d %d %s %.1f %.1f %.1f\n",Stu[i].id,Stu[i].Class,Stu[i].name,Stu[i].gs,Stu[i].dw,Stu[i].yy);
+		  }
+	  }
+  }//类型四 查询总分 
+  void type5()
+  {
+  	int a,b,c,i=0;
+    scanf("%d %d-%d",&a,&b,&c);
+    for(i;i<7;i++)
+	{
+     if(Stu[i].Class==a&&Stu[i].id>=b&&Stu[i].id<=c)
+     {
+    		printf("%d %d %s %.1f %.1f %.1f\n",Stu[i].id,Stu[i].Class,Stu[i].name,Stu[i].gs,Stu[i].dw,Stu[i].yy);
+	 }
+    }
+  }//类型五 查询班级中部分学号 
+int main()
+{
+	int n,a,b;
+	scanf("%d",&n);
+	switch(n)
+	{
+		case 1:type1() ;break;
+		case 2:type2() ;break;
+		case 3:type3() ;break;
+		case 4:type4() ;break;
+		case 5:type5() ;break;
+	}
+	return 0;
+ } 
\ No newline at end of file