using System;https://dotnetfiddle.net/kH19F0

public class Program

{

    public static void Main()

    {

        // Nama : alyani chania br ketaren.                                                          

        //umur : 18 tahun.       

        //alamat : pancur batu   

        //hobi: membaca

        int bil1, bil2, a, b, c;

        float d;

        Console.Write("Masukkan Bilangan 1: ");

        bil1 = Convert.ToInt32(Console.ReadLine());

        Console.Write("Masukkan Bilangan 2: ");

        bil2 = Convert.ToInt32(Console.ReadLine());

        a = bil1 + bil2;

        b = bil1 - bil2;

        c = bil1 * bil2;

        d = (float)bil1 / bil2;

        Console.WriteLine("{0} + {1} = {2}", bil1, bil2, a);

        Console.WriteLine("{0} - {1} = {2}", bil1, bil2, b);

        Console.WriteLine("{0} * {1} = {2}", bil1, bil2, c);

        Console.WriteLine("{0} / {1} = {2}", bil1, bil2, d);

    }

}