def d(a,b,c)
  n=(a<0)^(b<0)
  a=-a if n
  m=a/b-b/a
  l=m.to_s.size-1
  g=(a*10**(10+c)/b).to_s
  f=m<0?"."+"0"*(l-1)+g[0..c-l-1] : g[0..l]+"."+g[l+1..c-2]
  p n ? "-"+f : f
end
 
d(53228,16943,20)
				ZGVmIGQoYSxiLGMpCiAgbj0oYTwwKV4oYjwwKQogIGE9LWEgaWYgbgogIG09YS9iLWIvYQogIGw9bS50b19zLnNpemUtMQogIGc9KGEqMTAqKigxMCtjKS9iKS50b19zCiAgZj1tPDA/Ii4iKyIwIioobC0xKStnWzAuLmMtbC0xXSA6IGdbMC4ubF0rIi4iK2dbbCsxLi5jLTJdCiAgcCBuID8gIi0iK2YgOiBmCmVuZAoKZCg1MzIyOCwxNjk0MywyMCk=