diff --git a/学籍管理系统步骤7.c b/学籍管理系统步骤7.c
new file mode 100644
index 0000000..ba1f701
--- /dev/null
+++ b/学籍管理系统步骤7.c
@@ -0,0 +1,97 @@
+#include<stdio.h>
+#include<string.h> 
+#define N 7
+
+struct stu_info
+{
+	int num,cls,flag;
+	char name[10];
+	float maths,physics,english;
+};
+
+struct stu_info stu[N]={{10001,11,0,"Zhang",99.5,88.5,89.5},
+						{10002,12,0,"Yang",77.9,56.5,87.5},
+						{10003,11,0,"Liang",92.5,99.0,60.5},
+						{10004,11,0,"Cai",89.6,56.9,90.5},
+						{10005,14,0,"Fu",55.6,67.9,98.9},
+						{10006,12,0,"Mao",22.1,45.9,99.2},
+						{10007,13,0,"Zhan",35.6,67.9,88.0}};
+
+void sort(struct stu_info *stu,int n)
+{
+	int i,j;
+	struct stu_info tmp;
+	for(i=0;i<n;i++)
+	{
+		for(j=0;j<n-i-1;j++)
+		{
+			if(((stu+j)->cls>(stu+j+1)->cls)||((stu+j)->cls==(stu+j+1)->cls)&&((stu+j)->num>(stu+j+1)->num))
+			{
+				tmp = *(stu+j);
+				*(stu+j) = *(stu+j+1);
+				*(stu+j+1) = tmp;
+			} 
+		}
+	}
+	return;
+}
+void fcls()
+{
+	int start,end,i;
+	scanf("%d-%d",&start,&end); 
+	for(i=0;i<N;i++)
+	{
+		if(stu[i].cls<=end&&stu[i].cls>=start) 
+		printf("%d %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].maths,stu[i].physics,stu[i].english);
+	}
+}
+void fnum()
+{
+	int start,end,i;
+	scanf("%d-%d",&start,&end); 
+	for(i=0;i<N;i++)
+	{
+		if(stu[i].num<=end&&stu[i].num>=start) 
+		printf("%d %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].maths,stu[i].physics,stu[i].english);
+	}
+}
+void fname()
+{
+	char q[10];int i,j,flag=1;
+	scanf("%s",q);
+	for(i=0;i<N;i++)
+	{
+		for(j=0;q[j]!='*';j++)
+		{
+			if(q[j]!=stu[i].name[j])
+			flag=0;break;
+		}
+		if(flag) 
+		printf("%d %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].maths,stu[i].physics,stu[i].english);
+		flag=1;
+	}
+}
+void fsum()
+{
+	int i;
+	float e;
+	for(i=0;i<N;i++)
+	{
+		if(stu[i].english+stu[i].maths+stu[i].physics>=e)
+		printf("%d %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].maths,stu[i].physics,stu[i].english);
+	}
+}
+int main()
+{
+	sort(stu,N);
+	int i,type;
+	scanf("%d",&type);
+	switch(type)
+	{
+		case 1:fcls();break;
+		case 2:fnum();break;
+		case 3:fname();break;
+		case 4:fsum();break;
+		
+	}
+}