public static void Main()
Random rand = new Random();
for (int i = 0; i < 10; i++)
num = rand.Next(0, den+1);
Console.Write($"{num} / {den}");
num = rand.Next(0, den+1);
Console.Write($"{num} / {den}");
Console.WriteLine(den > 0 ? $" == {num/den}" : " == 0");