def cur_pos(a, d):

     if 0 <= d <= a:

         return d, 0.0

     elif a < d <= a + a:

         return a, d - a

     elif a + a < d <= a * 3:

         return 3 * a - d, a

     else:

         return 0.0, 4 * a - d

 a, d = map(float, raw_input().split())

 n = int(input())

 #这两行是为了使 d < 4 * a， 因为是浮点数，所以不好直接取余

 d = d * 1.0 / (4 * a) - int(d * 1.0 / (4 * a))

 d *= (4 * a)

 for i in xrange(1, n+1):

         #这里和上面一样，为了使 dd < 4 * a

     dd = i * d + 0.0;

     dd = dd / (4 * a) - int(dd / (4 * a))

     dd *= (4 * a)

     x, y = cur_pos(a, dd);

     print ("%.10f %.10f")%(x, y)