How come the result is 36 and 81? Explain

Question

static int Pow(int x, int y=2)
{
int result = 1;
for (int i = 0; i < y; i++)
{
result *= x;
}
return result;
}
static void Main(string[] args)
{
Console.WriteLine(Pow(6));

Console.WriteLine(Pow(3, 4));
}

Answer 1

Pow (6) uses the default value for y of 2. So is the same as Pow (6,2), or 6 squared. This is the same as saying 6*6, so that's 36
Then Pow (3,4) uses the value passed for y of 4. So that is 3 to the power of 4 or 3*3*3*3. That's 81.