Absolute Values and Fractions $$
\frac{|x|-|y|}{1+|xy|}
$$

How can I reduce the amount of code without losing quality? What are your tips? Your comments on the structure, logic, in general, everything. How to make the type of data entered by the user determined automatically?

 using System;
 class taskTwo {

static void Main() {

    int x, y; // Declare variables
    double z, w;
    Console.WriteLine("Please, enter two the numbers");
   x = int.Parse(Console.ReadLine()); //The user enters
    y = int.Parse(Console.ReadLine());

    if (x == 0 &amp;&amp; y == 0)//If two zeros are entered, then the numerator is 
                                                            zero. 
    {
        Console.WriteLine("The numerator and denominator can not be zero");
    }

    else {
        z = Math.Abs(x) - Math.Abs(y);//Know what the numerator is equal to 
        if (z == 0)//If the numerator is zero, then ... 
              {
                    Console.WriteLine("Numerator is zero, division is impossible");
                }
        else {
            w = z / (1 + Math.Abs(x) * Math.Abs(y)); //Final calculation
            Console.WriteLine("W = " + w); //Display the result on the screen
        }
    }


}}
There is no integer value for which this undefined. Having a zero in the numerator is a legal math operation that results as zero. having a zero in the denominator would result in an undefined result, but that concern is mitigated by the fact that the absolute value of the product of two integers will be greater than or equal to zero and then you add one to that product before doing the division. In other words, the smallest denominator that the equation could have is one which is legal. So you could remove the if statements

using System;

class TaskTwo {

    static void Main() {
        // Declare variables
        int x, y; 
        double w;

        Console.WriteLine("Please, enter two the numbers");
        x = int.Parse(Console.ReadLine());
        y = int.Parse(Console.ReadLine());


        w=(Math.Abs(x) - Math.Abs(y))/ (1 + Math.Abs(x*Y));

        // Display the result on the screen
        Console.WriteLine("W = " + w);
       }
    }


This should suffice.