Program output c sharp

Question

Write a program in C# Sharp to find the sum of the series [ x - x^3 + x^5 + ......] using for loop. I did till here...but not getting the ouput.

 

int x = int.Parse(Console.ReadLine());

int n = int.Parse(Console.ReadLine());

double sum = 0;

for (int i = 1; i <= n; i=i+2)

{

double result = Math.Pow(x, i);

sum = sum + result;

}

Console.WriteLine(sum);