typedef struct
{
	char class_name[7];
   char teacher[40];
   char room_no[15];
   char time[14];
   int student_num;
}	class_information;

typedef struct
{
	char roll_no[7];
   char full_name[40];
   char birthday[11];
   char address[50];
   char class_name[7];
}	student_information;






