using System;

​

public class Program

{

    public static void Main()

    {

        Double y, a = -5.7;

        Double b = 12.4;

        int x;

        y = Math.Round(12.5);

        Console.WriteLine("y={0}", y);

        y = Math.Round(12.51);

        Console.WriteLine("y={0}", y);

        y = Math.Round(a + b);

        Console.WriteLine("y={0}", y);

        x = (int)(Math.Round(a));

        Console.WriteLine("x={0}", x);

        x = (int)(Math.Round(a + 0.5));

        Console.WriteLine("x={0}", x);

    }

}