public static void Main()
public static void numbers()
Console.Write("Enter NUM1:");
double input1 = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter NUM2:");
double input2 = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("The sum of " + input1 + " and " + input2 + " is " + sum);
Console.WriteLine("The difference of " + input1 + " and " + input2 + " is " + dif);
Console.WriteLine("The product of " + input1 + " and " + input2 + " is " + mul);
Console.WriteLine("The quotient of " + input1 + " and " + input2 + " is " + div);