Pl/SQL Program of cursor

declare
student_name student.stu_name%type;
student_roll student.stu_roll%type;
cursor mycursor is select stu_name,stu_roll from student where stu_roll=16378;

begin
 open mycursor;
  loop
  fetch mycursor into student_name, student_roll;
  exit when mycursor%notfound;
  dbms_output.put_line(student_name ||' ' ||student_roll);
  end loop;
  close mycursor;
  end;