diff --git a/步骤七.c b/步骤七.c
new file mode 100644
index 0000000..8fa4f2a
--- /dev/null
+++ b/步骤七.c
@@ -0,0 +1,133 @@
+#include<stdio.h>
+#include<string.h>
+struct data
+{
+	long int num;
+	long int clas;
+	char name[20];
+	float grade1;
+	float grade2;
+	float grade3;
+};
+struct data 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};
+struct data stud;
+int main()
+{
+    void sort();
+    void print(struct data a);
+    sort();
+    int t;
+    scanf("%d",&t); 
+    if(t==1)
+    {   
+	    printf("请输入 班级-班级\n");
+    	int clas1,clas2;
+    	scanf("%ld-%ld",&clas1,&clas2);
+    	for(int i=0;i<7;i++)
+    	{
+    		if(stu[i].clas>=clas1&&stu[i].clas<=clas2)
+    		{
+			print(stu[i]);
+    		printf("\n");}
+		}
+	}
+	if(t==2)
+	{
+		int num1,num2;
+		printf("请输入 学号-学号\n");
+		scanf("%ld-%ld",&num1,&num2);
+		for(int i=0;i<7;i++)
+		{
+			if(stu[i].num>=num1&&stu[i].num<=num2)
+			{
+			print(stu[i]);
+			printf("\n");}
+		 } 
+	 } 
+	if(t==3)
+	{
+		printf("请输入要查询的人名开头几个字母\n");
+		char nam[10];int len;
+		scanf("%s",nam);
+		len=strlen(nam);
+		for(int i=0;i<7;i++)
+		{
+			int k=1;
+			for(int j=0;j<len;j++)
+			{
+				if(nam[j]!=stu[i].name[j])
+				k=0;
+			}
+			if(k==1)
+			{
+			print(stu[i]);
+			printf("\n");}
+		 } 
+	}
+	if(t==4)
+	{
+		printf("请输入要查询的分数\n");
+		long int score;
+		scanf("%ld",&score);
+		for(int i=0;i<7;i++)
+		{
+			if((stu[i].grade1+stu[i].grade2+stu[i].grade3)>=score)
+			{
+			print(stu[i]);
+			printf("\n");}
+		 } 
+	}
+	if(t==5)
+	{
+		printf("请输入 班级.学号-学号\n");
+		int cla,nu1,nu2;
+		scanf("%ld.%ld-%ld",&cla,&nu1,&nu2);
+		for(int i=0;i<7;i++)
+		{
+			if(stu[i].clas==cla&&stu[i].num>=nu1&&stu[i].num<=nu2)
+			{
+				print(stu[i]);
+				printf("\n");
+			}
+		 } 
+	}
+    
+ } 
+ void sort()
+ {
+ 	struct data temp; 
+ 	for(int i=0;i<7;i++)
+ 	{
+ 		for(int j=i+1;j<7;j++)
+ 		{
+ 			if(stu[i].clas>stu[j].clas)
+ 			{
+ 				temp=stu[i];
+ 				stu[i]=stu[j];
+ 				stu[j]=temp;
+			 }    
+		 }
+	 }
+	for(int i=0;i<7;i++)
+	{
+		for(int j=i+1;j<7;j++)
+		{
+			if(stu[i].num>stu[j].num&&stu[i].clas==stu[j].clas)
+			{
+				temp=stu[i];
+				stu[i]=stu[j];
+				stu[j]=temp;
+			}
+		}
+	}
+ }
+ void print(struct data a)
+ {
+ 	printf("%ld %ld %s %3.1f %3.1f %3.1f",a.num,a.clas,a.name,a.grade1,a.grade2,a.grade3);
+ }
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