class Program
{
    static void Main(string[] args)
    {
        // 파라미터 없는 ThreadStart 사용
        Thread t1 = new Thread(new ThreadStart(Run));
        t1.Start();

        // ParameterizedThreadStart 파라미터 전달
        // Start()의 파라미터로 radius 전달
        Thread t2 = new Thread(new ParameterizedThreadStart(Calc));
        t2.Start(10.00);
        
        // ThreadStart에서 파라미터 전달
        Thread t3 = new Thread(() => Sum(10, 20, 30));
        t3.Start();
    }

    static void Run()
    {
        Console.WriteLine("Run");
    }

    // radius라는 파라미터를 object 타입으로 받아들임
    static void Calc(object radius)
    {
        double r = (double)radius;
        double area = r * r * 3.14;
        Console.WriteLine("r={0},area={1}", r, area);
    }

    static void Sum(int d1, int d2, int d3)
    {
        int sum = d1 + d2 + d3;
        Console.WriteLine(sum);
    }
}

// Foreground 쓰레드
Thread t1 = new Thread(new ThreadStart(Run));            
t1.Start();
            
// 백그라운드 쓰레드
Thread t2 = new Thread(new ThreadStart(Run));
t2.IsBackground = true;
t2.Start();