C＃

Question

以下代码用于课堂作业问题。该程序的目标是使用模拟飞镖投掷在正方形内的一个圆上来估计Pi的值。想法是使用2个随机数来计算飞镖是否击中了圆圈。如果（x-0.5）^ 2 +（y-0.5）^ 2 <0.25，则飞镖落在圆内。 （“命中数” /未命中数）* 4是Pi的近似值。投掷的飞镖越多，估计就越接近。以下代码生成随机数，似乎在计算“ throwLocation”，但始终输出估计值0。我相信这可能是因为hits变量未正确递增。由于总点击数= 0，因此估计值将为0，因为0 /投掷次数始终为零。这段代码中的方法有问题吗？还是还有其他问题？谢谢

namespace hw_6_17
{
class PiWithDarts
{
    public int throwDarts;
    public int hits = 0;
    public double piEst;

    //increments the number of thrown darts
    public void DartThrown()
    {

        throwDarts++;
    }

    //calculates and tracks hits
    public void Hits()
    {
        double xValue;
        double yValue;
        double throwLocation;
        Random r = new Random();

        xValue = r.NextDouble();
        yValue = r.NextDouble();

        Console.WriteLine("{0}", xValue);
        Console.WriteLine("{0}", yValue);
        throwLocation = ((xValue - 0.5) * (xValue - 0.5)) + ((yValue - 0.5) * (yValue - 0.5));
        Console.WriteLine("throw, {0}", throwLocation);

        if (throwLocation < .25)
        {
            hits++;

        }

    }

    //estimate pi based on number of hits
    public void CalcPi()
    {
        piEst = (hits / throwDarts) * 4;
        Console.WriteLine("Based off the darts thrown, Pi is approximately {0}.", piEst);
        Console.ReadLine();
    }


    static void Main(string[] args)
    {
        int numToThrow;
        int count = 0;
        PiWithDarts NewRound = new PiWithDarts();


        Console.WriteLine("How many darts will be thrown?");
        numToThrow = int.Parse(Console.ReadLine());

        while(count < numToThrow)
        {
            NewRound.DartThrown();
            NewRound.Hits();
            count++;
        }

        NewRound.CalcPi();
    }
}
}

Answer 1

问题是throwDarts和hits的类型为int
您需要将这些int变量强制转换为double或float才能正确获得结果
您可以使用此

public void CalcPi()
    {
        piEst = ((double)hits / (double)throwDarts) * 4;
        Console.WriteLine("Based off the darts thrown, Pi is approximately {0}.", piEst);
        Console.ReadLine();
    }