Quadratic equation in Nimrod

from math import sqrt
from strutils import parseFloat

var A = parseFloat(readLine(stdin))
if A == 0.0:
  echo "Not a quadratic equation."
else:
  var B = parseFloat(readLine(stdin))
  var C = parseFloat(readLine(stdin))
  var D = B * B - 4.0 * A * C
  if D == 0.0:
    echo "x = ", -0.5 * B / A
  elif D > 0.0:
    echo "x1 = ", -0.5 * (B - sqrt(D)) / A
    echo "x2 = ", -0.5 * (B + sqrt(D)) / A
  else:
    echo "x1 = (", -0.5 * B / A, ", ",  0.5 * sqrt(-D) / A, ")"
    echo "x2 = (", -0.5 * B / A, ", ", -0.5 * sqrt(-D) / A, ")"