diff --git a/3.c b/3.c
new file mode 100644
index 0000000..a5b6123
--- /dev/null
+++ b/3.c
@@ -0,0 +1,70 @@
+#include <stdio.h>
+struct s {
+	int num;
+	float m;
+	float p;
+	float e;
+	float s;
+	float a;
+};
+void scan()
+{
+	struct s stu[3];
+	int i,j;
+	float sum;
+	for(i=0;i<3;i++)
+	{
+		scanf("%d %f %f %f",&stu[i].num,&stu[i].m,&stu[i].p,&stu[i].e);
+		stu[i].s=stu[i].m+stu[i].p+stu[i].e;
+		stu[i].a=stu[i].s/3.0;
+	}
+	struct s temp;
+	for(i=0;i<3;i++)
+	{
+		int k=i;
+		for(j=i;j<3;j++)
+		{
+			if(stu[k].s>stu[j].s)
+			{
+				temp=stu[j];
+				stu[j]=stu[k];
+				stu[k]=temp;
+			}
+		}
+	}
+	for(i=0;i<3;i++)
+	{
+	
+	printf("%d %d,%.1f %d,%.1f %d\n",stu[i].num,i+1,stu[i].s,i+1,stu[i].a,i+1);
+	}	
+}
+void main()
+{
+	printf("%*s%s\n",30,"","1.Input" );
+	printf("%*s%s\n",30,"","2.Output" );
+	printf("%*s%s\n",30,"","3.Order" );
+	printf("%*s%s\n",30,"","4.Quit" );
+	char ch;
+	scanf("%s",&ch);
+	printf("\n");
+	if(ch=='i')
+	{
+		printf("Please input info of the three students:");
+		scan();
+	}else{
+		if(ch=='o'){
+			printf("You are trying to Output info");
+		}else{
+			if(ch=='m'){
+				printf("You are trying to Make things ordered");
+			}else{
+				if(ch=='q'){
+					printf("You are about to Quit");
+				}else{
+					printf("Wrong input");
+				}
+			}
+		}
+	}
+		
+}