using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine($"1 + 2 = {1 + 2}");  // addition

        Console.WriteLine($"1 - 2 = {1 - 2}");  // subtraction

        Console.WriteLine($"2 * 3 = {2 * 3}");  // multiplication

        Console.WriteLine($"4 / 5 = {4 / 5}");  // integer division

        Console.WriteLine($"4 / 5.0 = {4 / 5.0}");  // floating-point division

        Console.WriteLine($"1 + 2 * 3 = {1 + 2 * 3}");  // operator precedence

        Console.WriteLine($"4 % 5 = {4 % 5}");  // modulus

    }

}