diff --git a/a5.c b/a5.c
new file mode 100644
index 0000000..b0fab4d
--- /dev/null
+++ b/a5.c
@@ -0,0 +1,96 @@
+#include <stdio.h>
+#include <string.h>
+struct stu {
+    char num[6];
+    int class;
+    char name[6];
+    float grade1;
+    float grade2;
+    float grade3;
+    float grade;
+}s[10],ss;
+int main()
+{
+	strcpy(s[0].num,"10001");s[0].class=11;strcpy(s[0].name,"Zhang");s[0].grade1=99.5;s[0].grade2=88.5;s[0].grade3=89.5;s[0].grade=s[0].grade1+s[0].grade2+s[0].grade3;
+	strcpy(s[1].num,"10002");s[1].class=12;strcpy(s[1].name,"Yang");s[1].grade1=77.9;s[1].grade2=56.5;s[1].grade3=87.5;s[1].grade=s[1].grade1+s[1].grade2+s[1].grade3;
+	strcpy(s[2].num,"10003");s[2].class=11;strcpy(s[2].name,"Liang");s[2].grade1=92.5;s[2].grade2=99.0;s[2].grade3=60.5;s[2].grade=s[2].grade1+s[2].grade2+s[2].grade3;
+	char z[6];
+	scanf("%s",z);
+	int a=0,m;
+	for(int i=0;i<3;i++)
+	{
+		if(strcmp(z,s[i].name)==0||strcmp(z,s[i].num)==0)
+		{
+			m=i;
+			a=1;
+			break;
+		}
+	}
+	if(a==1)
+	{
+		if(m<=1)
+	    {
+	        for(int j=m;j<2;j++)
+			{
+				s[j]=s[j+1];
+			}
+		}
+	    for(int i=0;i<1;i++)
+	    {
+	    	ss=s[i];
+	    	for(int j=i+1;j<2;j++)
+	    	{
+	    		if(s[i].grade<s[j].grade)
+	    		{
+	    			ss=s[i];
+	    			s[i]=s[j];
+	    			s[j]=ss;
+				}
+	    		
+			}
+		}
+	for(int i=0;i<2;i++)
+	{
+		printf("%s %d %s %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3);
+	}
+}
+else
+{
+for(int i=0;i<3;i++)
+	    {
+		printf("%s %d %s %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3);
+	    }
+	    return 0;
+	}
+	printf("Are you sure(yes/no)?\n");
+	char x;
+	scanf("%c",&x);
+	scanf("%c",&x);
+	if(x=='n')
+	{
+		strcpy(s[0].num,"10001");s[0].class=11;strcpy(s[0].name,"Zhang");s[0].grade1=99.5;s[0].grade2=88.5;s[0].grade3=89.5;
+	strcpy(s[1].num,"10002");s[1].class=12;strcpy(s[1].name,"Yang");s[1].grade1=77.9;s[1].grade2=56.5;s[1].grade3=87.5;
+	strcpy(s[2].num,"10003");s[2].class=11;strcpy(s[2].name,"Liang");s[2].grade1=92.5;s[2].grade2=99.0;s[2].grade3=60.5;
+	for(int i=0;i<2;i++)
+	    {
+	    	ss=s[i];
+	    	for(int j=i+1;j<3;j++)
+	    	{
+	    		if(s[i].grade<s[j].grade)
+	    		{
+	    			ss=s[i];
+	    			s[i]=s[j];
+	    			s[j]=ss;
+				}
+	    		
+			}
+		}
+		for(int i=0;i<3;i++)
+	    {
+		printf("%s %d %s %.1f %.1f %.1f\n",s[i].num,s[i].class,s[i].name,s[i].grade1,s[i].grade2,s[i].grade3);
+	    }
+	}
+	else if(x=='y')
+	return 0;
+	return 0;
+}
\ No newline at end of file