text: from ctypes import *
  import math, os
  
  so_file="./test.so"
  if os.name=="nt":
    so_file="./test.dll"
  lib = CDLL(so_file)
  assert lib.square(10) == 100, "Cannot validate V square()."
  
  lib.sqrt_of_sum_of_squares.restype = c_double
  assert lib.sqrt_of_sum_of_squares(c_double(1.1), c_double(2.2)) == math.sqrt(1.1*1.1 + 2.2*2.2), "Cannot validate V sqrt_of_sum_of_squares()."
  