why these code appear 36 81

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
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

y=2 is a default balie. Only used if no other value is specified.
Pow(3,4) , 4 is specified and used.
A specified value overrides the default.

Pow (6) , no value is specified so 2 is used

Answer 2

Pow(6) means x is set to 6 inside the function, however it also means y defaults to 2 (due to the y=2).

This means the loop executes twice, meaning result = 1 * 6, the first time, then 6*6 the second time. The function then returns result, which equals 36.

With Pow(3, 4)
x = 3, and y = 4
This means the loop executes four times...
so result = 1 * 3
result = 3 * 3
result = 9 * 3
result = 27 * 3

function then returns result, which is now 81.

Answer 3

okay great but one more question I have you wrote x = 3 y =4 , but in upstairs y is given 2 ...