diff --git a/program 6.c b/program 6.c
new file mode 100644
index 0000000..abac152
--- /dev/null
+++ b/program 6.c	
@@ -0,0 +1,61 @@
+#include<stdio.h>
+#include<string.h> 
+struct stu
+{
+	char num[20];
+	int c,x;
+	char name[20];
+	float m,p,e;
+};
+
+struct stu stu[3]={{"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}};
+
+void min(struct stu *stu,int n)
+{
+	int i,j;
+	struct stu t;
+	for(i=0;i<n;i++)
+	{
+		for(j=0;j<n-i-1;j++)
+		{
+			if(((stu+j)->c>(stu+j+1)->c)||((stu+j)->c==(stu+j+1)->c)&&((stu+j)->num>(stu+j+1)->num))
+			{
+				t = *(stu+j);
+				*(stu+j) = *(stu+j+1);
+				*(stu+j+1) = t;
+			} 
+		}
+	}
+	return;
+}
+
+int main()
+{
+	struct stu g;
+	scanf("%s",&g.num);
+	scanf("%d",&g.c);
+	scanf("%s",&g.name);
+	scanf("%f",&g.m);
+	scanf("%f",&g.p);
+	scanf("%f",&g.e);
+	int i;
+	for(i=0;i<3;i++)
+	{
+		if(strcmp(stu[i].num,g.num)==0)
+		{
+			*(stu+i)=g;
+		}
+	}
+	min(stu,3);
+	for(i=0;i<3;i++)
+	{
+		if(i==0||stu[i].c!=stu[i-1].c) printf("%2d ",stu[i].c);
+		else printf("   "); 
+		printf("%s %s %.1f %.1f %.1f",stu[i].num,stu[i].name,stu[i].m,stu[i].p,stu[i].e);
+		if(stu[i].x) printf(" modified");
+		printf("\n"); 
+	}
+	return 0;
+}