inline float multiply(const float &number1, const float &number2 )
{
  if (number1 == 0 || number2 == 0) return 0;
  if (number2 > 0) return number1 + multiply(number1, number2 - 1);
  if (number2 < 0) return -multiply(number1, -number2);
  return -1;
}

void shift_dec_point(float &number, int &decimal_positions)
{
  while(number - static_cast<int>(number) > 0.1)
  {
    number = multiply(number, 10);
    decimal_positions++;
  }
}

float squared(const float &number)
{
  float temp = number;
  if(temp < 0) temp = -temp;

  int decimal_positions = 0;
  shift_dec_point(temp, decimal_positions);
  float factor = temp;
  if(decimal_positions > 0) {
    temp = multiply(temp, temp);
      switch (decimal_positions){
        case 1: factor = 0.01; break;
        case 2: factor = 0.001; break;
        case 3: factor = 0.0001; break;
        case 4: factor = 0.00001;
      }
  }
  return multiply(factor,temp);
}