public void PowTest()
{
//check Pow(int a, int power)
Assert.AreEqual(9, OwnMath.pow(3, 2));
Assert.AreEqual(9, OwnMath.pow(-3, 2));
Assert.AreEqual(27, OwnMath.pow(3, 3));
Assert.AreEqual(0, OwnMath.pow(0, 2));
//check Pow(double a, double power)
Assert.AreEqual(10.889999999999999, OwnMath.pow(3.3, 2));
Assert.AreEqual(10.889999999999999, OwnMath.pow(-3.3, 2));
Assert.AreEqual(0.0, OwnMath.pow(0.0, 2));
}
static void Main(string[] args)
{
double output;
List <double> numbers = new List <double>();
string[] inputs = Console.ReadLine().Replace('.', ',').Split(Separator);
int strlen = inputs.Length;
double tmp = 0;
for (int i = 0; i < strlen; i++)
{
if (inputs[i] != string.Empty)
{
if (!double.TryParse(inputs[i], out tmp))
{
continue;
}
numbers.Add(tmp);
}
}
double N = numbers.Count;
double x_carka;
tmp = 0;
for (int i = 0; i < N; i++)
{
tmp = OwnMath.add(tmp, numbers[i]);
}
x_carka = OwnMath.mul(OwnMath.div(1, N), tmp);
tmp = 0;
for (int i = 0; i < N; i++)
{
tmp = OwnMath.add(tmp, OwnMath.pow(numbers[i], 2));
}
output = OwnMath.sqrt(OwnMath.mul(OwnMath.div(1, OwnMath.sub(N, 1)), OwnMath.sub(tmp, OwnMath.mul(N, OwnMath.pow(x_carka, 2)))));
Console.WriteLine(output);
}