diff --git a/5.c b/5.c
new file mode 100644
index 0000000..16067a5
--- /dev/null
+++ b/5.c
@@ -0,0 +1,65 @@
+#include<stdio.h>
+#include<string.h>
+#define N 3
+
+struct stu_info
+{
+	char num[20];
+	int cls,flag;
+	char name[20];
+	float math,physics,english,total;
+};
+
+struct stu_info stu[N]={{"10001",11,1,"Zhang",99.5,88.5,89.5},
+						{"10002",12,1,"Yang",77.9,56.5,87.5},
+						{"10003",11,1,"Liang",92.5,99.0,60.5}};
+
+
+void del(struct stu_info* stu,const char* key)
+{
+	int i,exist=0;
+	for (i=0;i<N;i++)
+	{
+		if(strcmp((stu+i)->num,key)==0||strcmp((stu+i)->name,key)==0)
+		{
+			(stu+i)->flag=0;
+			exist=1;
+		}
+	}
+	for(i=0;i<N;i++) if((stu+i)->flag) printf("%s %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].math,stu[i].physics,stu[i].english);
+	if(exist)
+	{
+		char yn;
+		printf("Are you sure(yes/no)?\n");
+		scanf(" %c",&yn);
+		if(yn=='y')
+		{
+			int st=0;
+			for(i=0;i<N-1;i++)
+			{
+				if(!(stu+i)->flag||st==1)
+				{
+					st=1;
+					*(stu+i)=*(stu+i+1);
+				}
+			}
+			return;
+		}
+		else if(yn=='n')
+		{
+			for(i=0;i<N;i++)
+			{
+				stu[i].flag=1;
+				printf("%s %d %s %.1f %.1f %.1f\n",stu[i].num,stu[i].cls,stu[i].name,stu[i].math,stu[i].physics,stu[i].english);
+			}
+		}
+	}
+}
+
+int main()
+{
+	char key[20];
+	scanf("%s",key);
+	del(stu,key);
+	return 0;
+}