public static async void DoPiCalc()
{
PiCalc theCalc = new PiCalc();
CalcResult cr = new CalcResult();
Task <double> task = theCalc.CalculateAsync(cr);
while (!cr.Quit)
{
Console.Write("Enter p (pi value), i (iterations) or q (quit) : ");
string userInput = Console.ReadLine();
if (userInput != null && userInput.Equals("p"))
{
double diffPercent = Math.Abs((Math.PI - cr.Pi) * 100.0 / Math.PI);
Console.WriteLine("Current value for pi : " + cr.Pi + " (" + diffPercent + " % diff.)");
}
else if (userInput != null && userInput.Equals("i"))
{
Console.WriteLine("Iterations so far : " + cr.Iterations);
}
else if (userInput != null && userInput.Equals("q"))
{
cr.Quit = true;
}
}
double finalPi = await task;
Console.WriteLine("Final value for pi : " + finalPi);
Console.WriteLine("Found after " + cr.Iterations + " iterations");
}
public async Task <double> CalculateAsync(CalcResult cr)
{
Random _generator = new Random();
int inside = 0;
double piCurrent = 0.0;
await Task.Run(() =>
{
for (long i = 1; i <= 1000000000000 && !cr.Quit; i++)
{
double x = _generator.NextDouble();
double y = _generator.NextDouble();
if (x *x + y *y < 1.0)
{
inside++;
}
piCurrent = inside * 4.0 / i;
cr.Pi = piCurrent;
cr.Iterations = i;
}
});
return(piCurrent);
}
