input: Write a function to check if two integers are equal. If the integers are equal, return True; otherwise, return False. If either of the integers is not provided, return False.
  assert check_integers_equal(10, 10)==True
  assert check_integers_equal(5, 7)==False
  assert check_integers_equal(0, 0)==True
  assert check_integers_equal(-1, 1)==False
  assert check_integers_equal(None, 10)==False
  assert check_integers_equal(10, None)==False
  assert check_integers_equal(None, None)==False
output: def check_integers_equal(a=None, b=None):
      if a is None or b is None:
          return False
      return a == b