{ // class
static void Main(string[] args)
{ // Main() start
// receive and initialize array length
Console.WriteLine("Enter number of points (10, 100, 1000, 10000) : ");
int size = Convert.ToInt32(Console.ReadLine());
double piApproximation = 0;
double numInCircle = 0;
// initialize multidimensional array
GridStruct[,] rngCoords = new GridStruct[size, 2];
// populate array with random x,y
for (int i = 0; i < size; i++)
{
for (int j = 0; j < 2; j++)
{
rngCoords[i, j] = new GridStruct(rng);
}
}
// iterate over array
foreach (GridStruct point in rngCoords)
{
// determine if point in circle
if (GetHypotenuse(point) <= 1.0)
{
// increment if in circle
++numInCircle;
}
}
// determine approximate pi
piApproximation = 4.0 * (numInCircle / rngCoords.Length);
// calculate absolute value difference
double absDiff = Math.Abs(piApproximation - Math.PI);
Console.WriteLine("Pi calculated with {0} random points.", size);
Console.WriteLine("Approximated Pi = {0}", piApproximation);
Console.WriteLine("\nDifference calculated between approximate and actual Pi.");
Console.WriteLine("Absolute difference = {0}", absDiff);
Console.Read();
}// Main() stop
// function takes x,y struct and returns hypotenuse
static double GetHypotenuse(GridStruct coords)
{// GetHypotenuse() start
double hypotenuse = Math.Sqrt(coords.X * coords.X + coords.Y * coords.Y);
return(hypotenuse);
} // GetHypotenuse() stop
